diff --git a/README.md b/README.md
index 86d8b15b..a81e1018 100644
--- a/README.md
+++ b/README.md
@@ -849,6 +849,7 @@ I deeply appreciate the help of the following people.
 - [Steffen](https://github.com/koemeet) fixed a potential issue with MSVC and `std::min`.
 - [Mike Tzou](https://github.com/Chocobo1) fixed some typos.
 - [amrcode](https://github.com/amrcode) noted a missleading documentation about comparison of floats.
+- [Oleg Endo](https://github.com/olegendo) reduced the memory consumption by replacing `<iostream>` with `<iosfwd>`
 
 
 Thanks a lot for helping out! Please [let me know](mailto:mail@nlohmann.me) if I forgot someone.
diff --git a/doc/examples/README.cpp b/doc/examples/README.cpp
index a93ee60a..00c93b5d 100644
--- a/doc/examples/README.cpp
+++ b/doc/examples/README.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/README.link b/doc/examples/README.link
index 8758bf05..19e3976a 100644
--- a/doc/examples/README.link
+++ b/doc/examples/README.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/Mi7u49cYwMR0cgTH"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/yCTCvQi0ZVxGuL3L"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/array.cpp b/doc/examples/array.cpp
index d3cc4777..b43be5a6 100644
--- a/doc/examples/array.cpp
+++ b/doc/examples/array.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/array.link b/doc/examples/array.link
index a7e40831..cd77ed14 100644
--- a/doc/examples/array.link
+++ b/doc/examples/array.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/dREyaxnVNgG1CAUx"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/jKwlQd7pFg6UcIN5"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/at__object_t_key_type.cpp b/doc/examples/at__object_t_key_type.cpp
index 611ca226..0430617e 100644
--- a/doc/examples/at__object_t_key_type.cpp
+++ b/doc/examples/at__object_t_key_type.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/at__object_t_key_type.link b/doc/examples/at__object_t_key_type.link
index cff20bea..b4d6efc8 100644
--- a/doc/examples/at__object_t_key_type.link
+++ b/doc/examples/at__object_t_key_type.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/rCEcfTCRY40LDvoR"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/FR2yYACZpx0k3Rzp"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/at__object_t_key_type_const.cpp b/doc/examples/at__object_t_key_type_const.cpp
index eae7da96..9aa2ed33 100644
--- a/doc/examples/at__object_t_key_type_const.cpp
+++ b/doc/examples/at__object_t_key_type_const.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/at__object_t_key_type_const.link b/doc/examples/at__object_t_key_type_const.link
index 43bb6c87..6e6ca335 100644
--- a/doc/examples/at__object_t_key_type_const.link
+++ b/doc/examples/at__object_t_key_type_const.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/SIuocSXktJ2lxj0q"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/aeF8S2D89A8lfVx1"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/at__size_type.cpp b/doc/examples/at__size_type.cpp
index 17381738..202e44b1 100644
--- a/doc/examples/at__size_type.cpp
+++ b/doc/examples/at__size_type.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/at__size_type.link b/doc/examples/at__size_type.link
index fea3bcd5..5dec3752 100644
--- a/doc/examples/at__size_type.link
+++ b/doc/examples/at__size_type.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/wB9tQWAyqeajJTVn"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/GmNdQadc8cWDzYpn"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/at__size_type_const.cpp b/doc/examples/at__size_type_const.cpp
index 3f67d378..33108ce8 100644
--- a/doc/examples/at__size_type_const.cpp
+++ b/doc/examples/at__size_type_const.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/at__size_type_const.link b/doc/examples/at__size_type_const.link
index 70dd9151..7412f09f 100644
--- a/doc/examples/at__size_type_const.link
+++ b/doc/examples/at__size_type_const.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/s5MsN3WV6zsGcWY4"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/zLkp80JFsKEuPd1t"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/at_json_pointer.cpp b/doc/examples/at_json_pointer.cpp
index 2cb62e2d..80ed6c15 100644
--- a/doc/examples/at_json_pointer.cpp
+++ b/doc/examples/at_json_pointer.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/at_json_pointer.link b/doc/examples/at_json_pointer.link
index 2e6a3e70..61a4410a 100644
--- a/doc/examples/at_json_pointer.link
+++ b/doc/examples/at_json_pointer.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/SXcTwaW8DVzDT34z"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/mlj2WqOtwBidvuJx"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/at_json_pointer_const.cpp b/doc/examples/at_json_pointer_const.cpp
index 3b09f65d..1496aa5a 100644
--- a/doc/examples/at_json_pointer_const.cpp
+++ b/doc/examples/at_json_pointer_const.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/at_json_pointer_const.link b/doc/examples/at_json_pointer_const.link
index 1ea3b078..31e0bb08 100644
--- a/doc/examples/at_json_pointer_const.link
+++ b/doc/examples/at_json_pointer_const.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/zOTLPM0c5dNFZhk3"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/vHKlyYl9DwaUO9UN"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/back.cpp b/doc/examples/back.cpp
index f4dcced3..cb227c2b 100644
--- a/doc/examples/back.cpp
+++ b/doc/examples/back.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/back.link b/doc/examples/back.link
index 8d757cde..fa1ce912 100644
--- a/doc/examples/back.link
+++ b/doc/examples/back.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/Sco4kIFMzpkYo37h"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/VXTfLJQl9x7NaHrI"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__CompatibleType.cpp b/doc/examples/basic_json__CompatibleType.cpp
index 85dbccd0..1066795b 100644
--- a/doc/examples/basic_json__CompatibleType.cpp
+++ b/doc/examples/basic_json__CompatibleType.cpp
@@ -1,10 +1,11 @@
-#include "json.hpp"
+#include <iostream>
 #include <deque>
 #include <list>
 #include <forward_list>
 #include <set>
 #include <unordered_map>
 #include <unordered_set>
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/basic_json__CompatibleType.link b/doc/examples/basic_json__CompatibleType.link
index 3ced745b..af1157b7 100644
--- a/doc/examples/basic_json__CompatibleType.link
+++ b/doc/examples/basic_json__CompatibleType.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/n2KT4Yk3mzZXKnS5"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/chmc1rH7aNZTIVSp"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__InputIt_InputIt.cpp b/doc/examples/basic_json__InputIt_InputIt.cpp
index 60043ff3..36c6f571 100644
--- a/doc/examples/basic_json__InputIt_InputIt.cpp
+++ b/doc/examples/basic_json__InputIt_InputIt.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/basic_json__InputIt_InputIt.link b/doc/examples/basic_json__InputIt_InputIt.link
index c7c09d38..aad58f73 100644
--- a/doc/examples/basic_json__InputIt_InputIt.link
+++ b/doc/examples/basic_json__InputIt_InputIt.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/gsHOHaLe3MfVhI2s"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/qpFQRSCnP6iVb3dF"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__basic_json.cpp b/doc/examples/basic_json__basic_json.cpp
index c218a8e5..98df6101 100644
--- a/doc/examples/basic_json__basic_json.cpp
+++ b/doc/examples/basic_json__basic_json.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/basic_json__basic_json.link b/doc/examples/basic_json__basic_json.link
index e8ac682d..e894b663 100644
--- a/doc/examples/basic_json__basic_json.link
+++ b/doc/examples/basic_json__basic_json.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/zUmWzPFVFx6sEojX"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/hRrKgHP2a0zgdxJ1"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__copyassignment.cpp b/doc/examples/basic_json__copyassignment.cpp
index b44e5993..4f1bc439 100644
--- a/doc/examples/basic_json__copyassignment.cpp
+++ b/doc/examples/basic_json__copyassignment.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/basic_json__copyassignment.link b/doc/examples/basic_json__copyassignment.link
index 1bff32a7..eec9258f 100644
--- a/doc/examples/basic_json__copyassignment.link
+++ b/doc/examples/basic_json__copyassignment.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/1BjO38rdSmNGxpyn"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/4p0zccjr9gUI65H2"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__list_init_t.cpp b/doc/examples/basic_json__list_init_t.cpp
index 5d77dbbc..ba1bce4e 100644
--- a/doc/examples/basic_json__list_init_t.cpp
+++ b/doc/examples/basic_json__list_init_t.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/basic_json__list_init_t.link b/doc/examples/basic_json__list_init_t.link
index 4419ca9a..75234b62 100644
--- a/doc/examples/basic_json__list_init_t.link
+++ b/doc/examples/basic_json__list_init_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/H0DDK6yuoCGZuoFw"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/XyDVBlGsU1DHpRl9"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__moveconstructor.cpp b/doc/examples/basic_json__moveconstructor.cpp
index ecfdb603..34827259 100644
--- a/doc/examples/basic_json__moveconstructor.cpp
+++ b/doc/examples/basic_json__moveconstructor.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/basic_json__moveconstructor.link b/doc/examples/basic_json__moveconstructor.link
index 7bad9910..f9047302 100644
--- a/doc/examples/basic_json__moveconstructor.link
+++ b/doc/examples/basic_json__moveconstructor.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/nXd0SKQaR6tHukvy"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/Z1uToOcza9ALJxNU"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__nullptr_t.cpp b/doc/examples/basic_json__nullptr_t.cpp
index 041a3269..886d5ea3 100644
--- a/doc/examples/basic_json__nullptr_t.cpp
+++ b/doc/examples/basic_json__nullptr_t.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/basic_json__nullptr_t.link b/doc/examples/basic_json__nullptr_t.link
index 143d20a2..003110f1 100644
--- a/doc/examples/basic_json__nullptr_t.link
+++ b/doc/examples/basic_json__nullptr_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/AbLqRqEEN5N9W1Fj"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/JQUGGZT8qZyQsHRv"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__size_type_basic_json.cpp b/doc/examples/basic_json__size_type_basic_json.cpp
index 1add4925..a021edda 100644
--- a/doc/examples/basic_json__size_type_basic_json.cpp
+++ b/doc/examples/basic_json__size_type_basic_json.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/basic_json__size_type_basic_json.link b/doc/examples/basic_json__size_type_basic_json.link
index e699f9ad..e48b9fd9 100644
--- a/doc/examples/basic_json__size_type_basic_json.link
+++ b/doc/examples/basic_json__size_type_basic_json.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/ecx4xZQX7VXuhlAz"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/l4fEe7Un5ctCQNuA"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__value.cpp b/doc/examples/basic_json__value.cpp
index fced71c3..42d4aa31 100644
--- a/doc/examples/basic_json__value.cpp
+++ b/doc/examples/basic_json__value.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/basic_json__value.link b/doc/examples/basic_json__value.link
index 3dc8a407..d0182781 100644
--- a/doc/examples/basic_json__value.link
+++ b/doc/examples/basic_json__value.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/bP03yg3IIbhARy2F"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/BRt1QpTsOBkiVcRC"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__value_ptr.cpp b/doc/examples/basic_json__value_ptr.cpp
index 262fbbf6..4f6f999e 100644
--- a/doc/examples/basic_json__value_ptr.cpp
+++ b/doc/examples/basic_json__value_ptr.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/basic_json__value_ptr.link b/doc/examples/basic_json__value_ptr.link
index 482c75f0..799f96f7 100644
--- a/doc/examples/basic_json__value_ptr.link
+++ b/doc/examples/basic_json__value_ptr.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/OY0l4CpfWuDJudyo"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/zTlubIHYOK6EGxnc"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__value_t.cpp b/doc/examples/basic_json__value_t.cpp
index 20cd3b4d..d52e628b 100644
--- a/doc/examples/basic_json__value_t.cpp
+++ b/doc/examples/basic_json__value_t.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/basic_json__value_t.link b/doc/examples/basic_json__value_t.link
index 8e999a8d..a66b1dd4 100644
--- a/doc/examples/basic_json__value_t.link
+++ b/doc/examples/basic_json__value_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/zRdz49DwtK0gIJuc"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/NlKuJEkKDx7IhN9Z"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/begin.cpp b/doc/examples/begin.cpp
index c2bb43ae..ebf97e5f 100644
--- a/doc/examples/begin.cpp
+++ b/doc/examples/begin.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/begin.link b/doc/examples/begin.link
index da79b631..64ac5fba 100644
--- a/doc/examples/begin.link
+++ b/doc/examples/begin.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/Q0QcnX1LAQT5k7IU"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/fTnaiB7w2ocgAsw8"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/cbegin.cpp b/doc/examples/cbegin.cpp
index f4353ef0..d12c8608 100644
--- a/doc/examples/cbegin.cpp
+++ b/doc/examples/cbegin.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/cbegin.link b/doc/examples/cbegin.link
index dee6deb2..fe670f15 100644
--- a/doc/examples/cbegin.link
+++ b/doc/examples/cbegin.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/ukuefRRIclE7D7IX"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/I7blCyINJHBX81JG"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/cend.cpp b/doc/examples/cend.cpp
index 08914124..8d141acf 100644
--- a/doc/examples/cend.cpp
+++ b/doc/examples/cend.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/cend.link b/doc/examples/cend.link
index 6dfc2277..3c726426 100644
--- a/doc/examples/cend.link
+++ b/doc/examples/cend.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/nHLMXLRwA3QWSnsQ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/LQmVooyLiQWjqnra"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/clear.cpp b/doc/examples/clear.cpp
index 055211cf..e892b13e 100644
--- a/doc/examples/clear.cpp
+++ b/doc/examples/clear.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/clear.link b/doc/examples/clear.link
index 91fa1f25..1123e2f3 100644
--- a/doc/examples/clear.link
+++ b/doc/examples/clear.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/WQS4WbZC6pX4qZE4"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/bJHYVEctvmaszdBj"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/count.cpp b/doc/examples/count.cpp
index b3f10d06..cd030fff 100644
--- a/doc/examples/count.cpp
+++ b/doc/examples/count.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/count.link b/doc/examples/count.link
index 6167a673..84666742 100644
--- a/doc/examples/count.link
+++ b/doc/examples/count.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/mrJDlTQD3orHnAdF"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/nAD5pUgjv1DcMhh7"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/crbegin.cpp b/doc/examples/crbegin.cpp
index df0868ab..6dc4a6f7 100644
--- a/doc/examples/crbegin.cpp
+++ b/doc/examples/crbegin.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/crbegin.link b/doc/examples/crbegin.link
index 49072710..f97dac66 100644
--- a/doc/examples/crbegin.link
+++ b/doc/examples/crbegin.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/XsC14rus4L6meQTg"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/3ylcqXCMzsKBSkxZ"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/crend.cpp b/doc/examples/crend.cpp
index 20c2f82a..9a00950c 100644
--- a/doc/examples/crend.cpp
+++ b/doc/examples/crend.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/crend.link b/doc/examples/crend.link
index 7c244144..208c7c96 100644
--- a/doc/examples/crend.link
+++ b/doc/examples/crend.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/jr4aG41Zr1pWUlAw"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/viOKm4V0ccy238mU"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/diff.cpp b/doc/examples/diff.cpp
index 982b8f9c..ee0aefc0 100644
--- a/doc/examples/diff.cpp
+++ b/doc/examples/diff.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/diff.link b/doc/examples/diff.link
index d0bed27a..e1cfdb8d 100644
--- a/doc/examples/diff.link
+++ b/doc/examples/diff.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/KKfCy1yctyq7PBI1"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/DKPu3VnNVgsQbaSX"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/dump.cpp b/doc/examples/dump.cpp
index d1359684..4ffd2aa4 100644
--- a/doc/examples/dump.cpp
+++ b/doc/examples/dump.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/dump.link b/doc/examples/dump.link
index ae5a4aba..2e3fee96 100644
--- a/doc/examples/dump.link
+++ b/doc/examples/dump.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/HjYnuCSOxokNvsRW"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/0rB2LKUCjPlU90XK"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/emplace.cpp b/doc/examples/emplace.cpp
index 2af633eb..7e80b68c 100644
--- a/doc/examples/emplace.cpp
+++ b/doc/examples/emplace.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/emplace.link b/doc/examples/emplace.link
index b689c476..809cc21e 100644
--- a/doc/examples/emplace.link
+++ b/doc/examples/emplace.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/mvy0nMn3uStrP9tS"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/xc7HomW1EFM5PV6n"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/emplace_back.cpp b/doc/examples/emplace_back.cpp
index f76e599f..6a50fd20 100644
--- a/doc/examples/emplace_back.cpp
+++ b/doc/examples/emplace_back.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/emplace_back.link b/doc/examples/emplace_back.link
index 824c95df..9397a892 100644
--- a/doc/examples/emplace_back.link
+++ b/doc/examples/emplace_back.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/wvLvTvPt0dovixFE"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/2WSVQXWzRVuAg5pV"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/empty.cpp b/doc/examples/empty.cpp
index a4c71b52..94bc46a3 100644
--- a/doc/examples/empty.cpp
+++ b/doc/examples/empty.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/empty.link b/doc/examples/empty.link
index c16e0296..90a6590e 100644
--- a/doc/examples/empty.link
+++ b/doc/examples/empty.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/g1mZBQAdSJE3cNCH"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/1fN2q9R8yJ9LCSlm"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/end.cpp b/doc/examples/end.cpp
index 5eeec81d..2984f9ea 100644
--- a/doc/examples/end.cpp
+++ b/doc/examples/end.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/end.link b/doc/examples/end.link
index 4ced3b90..2695e1d5 100644
--- a/doc/examples/end.link
+++ b/doc/examples/end.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/vp0L5nlCJewdlolt"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/akgHtQw6EFosJSDq"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/erase__IteratorType.cpp b/doc/examples/erase__IteratorType.cpp
index 2ec6204f..0ba7e6fc 100644
--- a/doc/examples/erase__IteratorType.cpp
+++ b/doc/examples/erase__IteratorType.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/erase__IteratorType.link b/doc/examples/erase__IteratorType.link
index 50571c91..71d41146 100644
--- a/doc/examples/erase__IteratorType.link
+++ b/doc/examples/erase__IteratorType.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/N0oo892iXEqaUzej"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/LbNMVYCXawbEelo0"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/erase__IteratorType_IteratorType.cpp b/doc/examples/erase__IteratorType_IteratorType.cpp
index ef3f070c..efbf789e 100644
--- a/doc/examples/erase__IteratorType_IteratorType.cpp
+++ b/doc/examples/erase__IteratorType_IteratorType.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/erase__IteratorType_IteratorType.link b/doc/examples/erase__IteratorType_IteratorType.link
index fb7fca42..9209f64c 100644
--- a/doc/examples/erase__IteratorType_IteratorType.link
+++ b/doc/examples/erase__IteratorType_IteratorType.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/SO3kgH5glqC18wJy"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/KknUwdprg6lIp5YK"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/erase__key_type.cpp b/doc/examples/erase__key_type.cpp
index e035c23b..592aa020 100644
--- a/doc/examples/erase__key_type.cpp
+++ b/doc/examples/erase__key_type.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/erase__key_type.link b/doc/examples/erase__key_type.link
index 8a1579c9..b3ab45ef 100644
--- a/doc/examples/erase__key_type.link
+++ b/doc/examples/erase__key_type.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/wyOm5ERfxlXcwcSV"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/IN4AQ9AD1JPDNj9Q"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/erase__size_type.cpp b/doc/examples/erase__size_type.cpp
index 68bbab64..72021bad 100644
--- a/doc/examples/erase__size_type.cpp
+++ b/doc/examples/erase__size_type.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/erase__size_type.link b/doc/examples/erase__size_type.link
index cd20c392..33a124ca 100644
--- a/doc/examples/erase__size_type.link
+++ b/doc/examples/erase__size_type.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/lxSvv5XGZ8Hmhnwl"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/xCM0BG9ZV6iEMdgr"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/find__key_type.cpp b/doc/examples/find__key_type.cpp
index cb4a51c7..c411ba4f 100644
--- a/doc/examples/find__key_type.cpp
+++ b/doc/examples/find__key_type.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/find__key_type.link b/doc/examples/find__key_type.link
index bf003fb1..0be7a24a 100644
--- a/doc/examples/find__key_type.link
+++ b/doc/examples/find__key_type.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/yqzasB01C3NGORaT"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/iu2BpRtjiKeJu2pv"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/flatten.cpp b/doc/examples/flatten.cpp
index b0cf9b6c..a69c31d4 100644
--- a/doc/examples/flatten.cpp
+++ b/doc/examples/flatten.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/flatten.link b/doc/examples/flatten.link
index b5285f3c..4d03de6b 100644
--- a/doc/examples/flatten.link
+++ b/doc/examples/flatten.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/qGLscdPoE6QH87oD"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/TpEB8tou7Wuyprkm"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/from_cbor.cpp b/doc/examples/from_cbor.cpp
index 5d78be8f..b0340f17 100644
--- a/doc/examples/from_cbor.cpp
+++ b/doc/examples/from_cbor.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/from_cbor.link b/doc/examples/from_cbor.link
index 15a2bf40..129e0332 100644
--- a/doc/examples/from_cbor.link
+++ b/doc/examples/from_cbor.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/DUNMc8fjsGi5C7Ea"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/X9wSCDZNg82T3oix"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/from_msgpack.cpp b/doc/examples/from_msgpack.cpp
index a16c1bdd..5df9ef3e 100644
--- a/doc/examples/from_msgpack.cpp
+++ b/doc/examples/from_msgpack.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/from_msgpack.link b/doc/examples/from_msgpack.link
index a4818bd7..7d3a1438 100644
--- a/doc/examples/from_msgpack.link
+++ b/doc/examples/from_msgpack.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/wSkYD6Q5RqJWmt3s"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/9MjZO7niLtZaJIIx"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/front.cpp b/doc/examples/front.cpp
index e9f09d0c..bbc372e0 100644
--- a/doc/examples/front.cpp
+++ b/doc/examples/front.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/front.link b/doc/examples/front.link
index e3f57b3d..4f8bcd77 100644
--- a/doc/examples/front.link
+++ b/doc/examples/front.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/fbTQdF5PwEeaC2lq"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/bK69SEGarbCwnqIB"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/get__PointerType.cpp b/doc/examples/get__PointerType.cpp
index 613305f9..29f9ad34 100644
--- a/doc/examples/get__PointerType.cpp
+++ b/doc/examples/get__PointerType.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/get__PointerType.link b/doc/examples/get__PointerType.link
index 5c0713d5..73a3fc51 100644
--- a/doc/examples/get__PointerType.link
+++ b/doc/examples/get__PointerType.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/YwRJe95xb68JVjuI"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/eMrmXhPWD02HJX9x"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/get__ValueType_const.cpp b/doc/examples/get__ValueType_const.cpp
index 3fdd2834..d78a6b26 100644
--- a/doc/examples/get__ValueType_const.cpp
+++ b/doc/examples/get__ValueType_const.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <unordered_map>
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/get__ValueType_const.link b/doc/examples/get__ValueType_const.link
index d58c1789..7bf5e8a3 100644
--- a/doc/examples/get__ValueType_const.link
+++ b/doc/examples/get__ValueType_const.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/FeK53w3zimBjOhtB"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/jAZwFrdZS3DgPh1n"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/get_ptr.cpp b/doc/examples/get_ptr.cpp
index 54288450..27deb149 100644
--- a/doc/examples/get_ptr.cpp
+++ b/doc/examples/get_ptr.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/get_ptr.link b/doc/examples/get_ptr.link
index 2b158c8f..6c4a0684 100644
--- a/doc/examples/get_ptr.link
+++ b/doc/examples/get_ptr.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/6DBW0AukFiY85CMq"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/qnJvFdIQATMPuL6R"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/get_ref.cpp b/doc/examples/get_ref.cpp
index c07d8488..951fea3e 100644
--- a/doc/examples/get_ref.cpp
+++ b/doc/examples/get_ref.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/get_ref.link b/doc/examples/get_ref.link
index 1181b7c6..d5bb4cfd 100644
--- a/doc/examples/get_ref.link
+++ b/doc/examples/get_ref.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/868NoVK7iU0BZHKz"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/BbthopNwIhKgb4Y9"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/insert.cpp b/doc/examples/insert.cpp
index 99879566..913ad09d 100644
--- a/doc/examples/insert.cpp
+++ b/doc/examples/insert.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/insert.link b/doc/examples/insert.link
index f3f4e4bc..803d5c62 100644
--- a/doc/examples/insert.link
+++ b/doc/examples/insert.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/Af1lyC9TuTbIaNHy"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/KrT6PSRUrEC3E6cx"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/insert__count.cpp b/doc/examples/insert__count.cpp
index 11460e51..3c2ac24a 100644
--- a/doc/examples/insert__count.cpp
+++ b/doc/examples/insert__count.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/insert__count.link b/doc/examples/insert__count.link
index 103795f5..a76cd8e2 100644
--- a/doc/examples/insert__count.link
+++ b/doc/examples/insert__count.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/J7tEcc5RiRckp3aH"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/RRGqHw8PbuHfJ2MF"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/insert__ilist.cpp b/doc/examples/insert__ilist.cpp
index fa9e8612..90965b37 100644
--- a/doc/examples/insert__ilist.cpp
+++ b/doc/examples/insert__ilist.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/insert__ilist.link b/doc/examples/insert__ilist.link
index 13805fbf..387dce69 100644
--- a/doc/examples/insert__ilist.link
+++ b/doc/examples/insert__ilist.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/qgQADJFErGWzwFS3"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/Fouhqv1pfmWQ8h17"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/insert__range.cpp b/doc/examples/insert__range.cpp
index 8e8a5977..5b0aa9ea 100644
--- a/doc/examples/insert__range.cpp
+++ b/doc/examples/insert__range.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/insert__range.link b/doc/examples/insert__range.link
index 30440793..cd8107c0 100644
--- a/doc/examples/insert__range.link
+++ b/doc/examples/insert__range.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/n97dklxei6VGm4nn"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/EWKlbEm2NczIX0Kt"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/insert__range_object.cpp b/doc/examples/insert__range_object.cpp
index 3f266b22..b811f8aa 100644
--- a/doc/examples/insert__range_object.cpp
+++ b/doc/examples/insert__range_object.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/insert__range_object.link b/doc/examples/insert__range_object.link
index f6eb481a..7c67093b 100644
--- a/doc/examples/insert__range_object.link
+++ b/doc/examples/insert__range_object.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/lj1jKDLtLmx2v1G0"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/JewC0qDxdcbAB0oB"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_array.cpp b/doc/examples/is_array.cpp
index 7a5d20bf..1dbbf5d2 100644
--- a/doc/examples/is_array.cpp
+++ b/doc/examples/is_array.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/is_array.link b/doc/examples/is_array.link
index ad18000c..7820d336 100644
--- a/doc/examples/is_array.link
+++ b/doc/examples/is_array.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/DvtGvyx9zygjT0kS"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/zL2Z6V2oDAYBfsw8"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_boolean.cpp b/doc/examples/is_boolean.cpp
index d3a0e178..485f9704 100644
--- a/doc/examples/is_boolean.cpp
+++ b/doc/examples/is_boolean.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/is_boolean.link b/doc/examples/is_boolean.link
index bb89c4a0..9b56f6ed 100644
--- a/doc/examples/is_boolean.link
+++ b/doc/examples/is_boolean.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/Io4dYYukmsvBsBhZ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/OPxNx0zPQByL6wTD"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_discarded.cpp b/doc/examples/is_discarded.cpp
index f4953bf9..0b0435c3 100644
--- a/doc/examples/is_discarded.cpp
+++ b/doc/examples/is_discarded.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/is_discarded.link b/doc/examples/is_discarded.link
index 407667aa..f20d9ce9 100644
--- a/doc/examples/is_discarded.link
+++ b/doc/examples/is_discarded.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/sznqCvDTQxq642QL"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/QRFjILGEmqFv8UTH"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_null.cpp b/doc/examples/is_null.cpp
index 9dd0528c..3043e184 100644
--- a/doc/examples/is_null.cpp
+++ b/doc/examples/is_null.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/is_null.link b/doc/examples/is_null.link
index 6ead545c..05b27018 100644
--- a/doc/examples/is_null.link
+++ b/doc/examples/is_null.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/imhZMfDkB8bFRp7q"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/28oi4wU44VJlAFuN"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_number.cpp b/doc/examples/is_number.cpp
index a0baff32..08fa138d 100644
--- a/doc/examples/is_number.cpp
+++ b/doc/examples/is_number.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/is_number.link b/doc/examples/is_number.link
index 7e291e79..b1e9ad2a 100644
--- a/doc/examples/is_number.link
+++ b/doc/examples/is_number.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/PMSuHln29jOu8ySo"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/8ZDtESuv4axwzLWS"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_number_float.cpp b/doc/examples/is_number_float.cpp
index a67d9271..aeef78e8 100644
--- a/doc/examples/is_number_float.cpp
+++ b/doc/examples/is_number_float.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/is_number_float.link b/doc/examples/is_number_float.link
index 3f56570a..17208079 100644
--- a/doc/examples/is_number_float.link
+++ b/doc/examples/is_number_float.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/jf7HjebGYWYKNMJQ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/TBMRmOeVMVqAqteQ"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_number_integer.cpp b/doc/examples/is_number_integer.cpp
index b8f772ef..90bd2146 100644
--- a/doc/examples/is_number_integer.cpp
+++ b/doc/examples/is_number_integer.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/is_number_integer.link b/doc/examples/is_number_integer.link
index 692d0208..a35be75d 100644
--- a/doc/examples/is_number_integer.link
+++ b/doc/examples/is_number_integer.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/1HGdpuy7JGkt6IZd"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/aEbSUBKUmWl7Dtgu"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_number_unsigned.cpp b/doc/examples/is_number_unsigned.cpp
index 7cd04a31..499530c5 100644
--- a/doc/examples/is_number_unsigned.cpp
+++ b/doc/examples/is_number_unsigned.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/is_number_unsigned.link b/doc/examples/is_number_unsigned.link
index 930ec498..0a2ba020 100644
--- a/doc/examples/is_number_unsigned.link
+++ b/doc/examples/is_number_unsigned.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/nlZ9nbm8xJjTAsMe"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/YRHsTGmB2C2olbOB"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_object.cpp b/doc/examples/is_object.cpp
index 1fe66ec2..a0c03a76 100644
--- a/doc/examples/is_object.cpp
+++ b/doc/examples/is_object.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/is_object.link b/doc/examples/is_object.link
index 5bfaa41a..0cf3d4ad 100644
--- a/doc/examples/is_object.link
+++ b/doc/examples/is_object.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/5nZW4U1bUA5lem25"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/zMdF7NYFMr9KBEPv"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_primitive.cpp b/doc/examples/is_primitive.cpp
index fb863b61..ab329bdb 100644
--- a/doc/examples/is_primitive.cpp
+++ b/doc/examples/is_primitive.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/is_primitive.link b/doc/examples/is_primitive.link
index aa46ead7..2a0e91b9 100644
--- a/doc/examples/is_primitive.link
+++ b/doc/examples/is_primitive.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/V4emskHeUktlVOxh"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/MnHvWAzSyqxGkMjB"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_string.cpp b/doc/examples/is_string.cpp
index df887007..44cb483c 100644
--- a/doc/examples/is_string.cpp
+++ b/doc/examples/is_string.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/is_string.link b/doc/examples/is_string.link
index b4d8cc39..f3672db3 100644
--- a/doc/examples/is_string.link
+++ b/doc/examples/is_string.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/lb59ps8hvZkRQtly"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/I8BpwtFc2QJ6Z1Vl"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_structured.cpp b/doc/examples/is_structured.cpp
index 66016083..b7dfc858 100644
--- a/doc/examples/is_structured.cpp
+++ b/doc/examples/is_structured.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/is_structured.link b/doc/examples/is_structured.link
index ef6804b7..8ea3a75f 100644
--- a/doc/examples/is_structured.link
+++ b/doc/examples/is_structured.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/oe0ULeAlBAiaqUxh"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/sE3xMx8q6T0EX0qK"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/iterator_wrapper.cpp b/doc/examples/iterator_wrapper.cpp
index 208bb705..61687a92 100644
--- a/doc/examples/iterator_wrapper.cpp
+++ b/doc/examples/iterator_wrapper.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/iterator_wrapper.link b/doc/examples/iterator_wrapper.link
index c8f696c3..0087d9a1 100644
--- a/doc/examples/iterator_wrapper.link
+++ b/doc/examples/iterator_wrapper.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/YkOQK9sqEfbKUF31"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/FYbRVHJSU3rsOSoo"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/json_pointer.cpp b/doc/examples/json_pointer.cpp
index 333d3963..23e8e84f 100644
--- a/doc/examples/json_pointer.cpp
+++ b/doc/examples/json_pointer.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/json_pointer.link b/doc/examples/json_pointer.link
index 541a97d8..3ba4355f 100644
--- a/doc/examples/json_pointer.link
+++ b/doc/examples/json_pointer.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/JdZq6bQWjrHew4Dy"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/G3xdluSrBF8Zfybi"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/json_pointer__to_string.cpp b/doc/examples/json_pointer__to_string.cpp
index fc7f2557..70b72778 100644
--- a/doc/examples/json_pointer__to_string.cpp
+++ b/doc/examples/json_pointer__to_string.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/json_pointer__to_string.link b/doc/examples/json_pointer__to_string.link
index 5cae597e..b1148125 100644
--- a/doc/examples/json_pointer__to_string.link
+++ b/doc/examples/json_pointer__to_string.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/t6BQ8xMgkSUIcy1m"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/R67usvQfh9O9kK3u"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/max_size.cpp b/doc/examples/max_size.cpp
index 27989271..8273f86f 100644
--- a/doc/examples/max_size.cpp
+++ b/doc/examples/max_size.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/max_size.link b/doc/examples/max_size.link
index 2bca668d..d49f5ea8 100644
--- a/doc/examples/max_size.link
+++ b/doc/examples/max_size.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/9j9TwfNlZ88Hvwdi"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/Dh9VyEp2fGAbTkUI"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/meta.cpp b/doc/examples/meta.cpp
index 8e4ad3de..5a762322 100644
--- a/doc/examples/meta.cpp
+++ b/doc/examples/meta.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/meta.link b/doc/examples/meta.link
index 05b7ef06..ca563582 100644
--- a/doc/examples/meta.link
+++ b/doc/examples/meta.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/GTMgDs6Q8uLToRvb"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/M9jbzex4Xj2l25ce"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/object.cpp b/doc/examples/object.cpp
index 3c089b0f..6c117758 100644
--- a/doc/examples/object.cpp
+++ b/doc/examples/object.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/object.link b/doc/examples/object.link
index 0a435eb1..f8638334 100644
--- a/doc/examples/object.link
+++ b/doc/examples/object.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/UeOjT4BeGKdE345o"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/GJqwS8AKJxq6aIfN"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__ValueType.cpp b/doc/examples/operator__ValueType.cpp
index 4895fe1e..2def5271 100644
--- a/doc/examples/operator__ValueType.cpp
+++ b/doc/examples/operator__ValueType.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <unordered_map>
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/operator__ValueType.link b/doc/examples/operator__ValueType.link
index 84497ae4..0c32d631 100644
--- a/doc/examples/operator__ValueType.link
+++ b/doc/examples/operator__ValueType.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/3bM7J4Qlj1Cl9EUK"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/PhHYhHJrFVDCwxJz"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__equal.cpp b/doc/examples/operator__equal.cpp
index e9910f32..d541a212 100644
--- a/doc/examples/operator__equal.cpp
+++ b/doc/examples/operator__equal.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operator__equal.link b/doc/examples/operator__equal.link
index 910bf449..ae7c25ae 100644
--- a/doc/examples/operator__equal.link
+++ b/doc/examples/operator__equal.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/D7ff222CtzQaAXUK"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/aj64YWLRD21qZE18"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__equal__nullptr_t.cpp b/doc/examples/operator__equal__nullptr_t.cpp
index d7c2fbdc..b5d0c640 100644
--- a/doc/examples/operator__equal__nullptr_t.cpp
+++ b/doc/examples/operator__equal__nullptr_t.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operator__equal__nullptr_t.link b/doc/examples/operator__equal__nullptr_t.link
index 30030502..90cc1744 100644
--- a/doc/examples/operator__equal__nullptr_t.link
+++ b/doc/examples/operator__equal__nullptr_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/2PPEeLTQTrbE8cVN"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/LbrZ2kGw20CIeN6s"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__greater.cpp b/doc/examples/operator__greater.cpp
index 1860625c..a5c4f78a 100644
--- a/doc/examples/operator__greater.cpp
+++ b/doc/examples/operator__greater.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operator__greater.link b/doc/examples/operator__greater.link
index f28c8fe0..7f082791 100644
--- a/doc/examples/operator__greater.link
+++ b/doc/examples/operator__greater.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/whYWnKZxQV8vyrUV"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/ryX5yGEi0FO6jZz2"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__greaterequal.cpp b/doc/examples/operator__greaterequal.cpp
index e1d5d8b7..da014bde 100644
--- a/doc/examples/operator__greaterequal.cpp
+++ b/doc/examples/operator__greaterequal.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operator__greaterequal.link b/doc/examples/operator__greaterequal.link
index a03af050..599f5d7b 100644
--- a/doc/examples/operator__greaterequal.link
+++ b/doc/examples/operator__greaterequal.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/vIBUY6LRmKBQOgiR"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/b0qsMsIDCrNduuZ7"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__less.cpp b/doc/examples/operator__less.cpp
index 53a595a9..3865847f 100644
--- a/doc/examples/operator__less.cpp
+++ b/doc/examples/operator__less.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operator__less.link b/doc/examples/operator__less.link
index 9d8a489a..0689f995 100644
--- a/doc/examples/operator__less.link
+++ b/doc/examples/operator__less.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/ZvESrmjGKoagilJr"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/otGM5StP1x4jd5CQ"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__lessequal.cpp b/doc/examples/operator__lessequal.cpp
index 6d82e894..8e9a21f1 100644
--- a/doc/examples/operator__lessequal.cpp
+++ b/doc/examples/operator__lessequal.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operator__lessequal.link b/doc/examples/operator__lessequal.link
index 637846fb..57681851 100644
--- a/doc/examples/operator__lessequal.link
+++ b/doc/examples/operator__lessequal.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/igiFsYkK3wJxbUBe"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/CRVuBTc86hxTNH4X"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__notequal.cpp b/doc/examples/operator__notequal.cpp
index 802447b0..debcdf8a 100644
--- a/doc/examples/operator__notequal.cpp
+++ b/doc/examples/operator__notequal.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operator__notequal.link b/doc/examples/operator__notequal.link
index bf369092..c23e8263 100644
--- a/doc/examples/operator__notequal.link
+++ b/doc/examples/operator__notequal.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/NO1FFrAierprHk0j"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/g6U57ryXVuvgwSUB"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__notequal__nullptr_t.cpp b/doc/examples/operator__notequal__nullptr_t.cpp
index e65dcd7c..8d74e713 100644
--- a/doc/examples/operator__notequal__nullptr_t.cpp
+++ b/doc/examples/operator__notequal__nullptr_t.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operator__notequal__nullptr_t.link b/doc/examples/operator__notequal__nullptr_t.link
index f8be3cbe..49864d34 100644
--- a/doc/examples/operator__notequal__nullptr_t.link
+++ b/doc/examples/operator__notequal__nullptr_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/ejLtGKtacU0xiZV4"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/ywBPZQjmlieF7sv0"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__value_t.cpp b/doc/examples/operator__value_t.cpp
index dfcf0c3b..246243c1 100644
--- a/doc/examples/operator__value_t.cpp
+++ b/doc/examples/operator__value_t.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operator__value_t.link b/doc/examples/operator__value_t.link
index 2acdc711..94d67cfd 100644
--- a/doc/examples/operator__value_t.link
+++ b/doc/examples/operator__value_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/hVycygNLPkyFqvN5"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/daNU6Fj8JuV07nBn"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator_deserialize.cpp b/doc/examples/operator_deserialize.cpp
index bf9d7795..06656b65 100644
--- a/doc/examples/operator_deserialize.cpp
+++ b/doc/examples/operator_deserialize.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/operator_deserialize.link b/doc/examples/operator_deserialize.link
index caf6025a..4544a65b 100644
--- a/doc/examples/operator_deserialize.link
+++ b/doc/examples/operator_deserialize.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/yeEdM1SY7CloqFt3"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/doaPmtdJ277jNm9C"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator_serialize.cpp b/doc/examples/operator_serialize.cpp
index 1d817816..d808e869 100644
--- a/doc/examples/operator_serialize.cpp
+++ b/doc/examples/operator_serialize.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/operator_serialize.link b/doc/examples/operator_serialize.link
index 104ce0fd..9d5d0102 100644
--- a/doc/examples/operator_serialize.link
+++ b/doc/examples/operator_serialize.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/ibCUjqfsQiAglDVe"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/0Ec7N50CDWAWPWEE"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operatorarray__key_type.cpp b/doc/examples/operatorarray__key_type.cpp
index 2438f991..a42335a3 100644
--- a/doc/examples/operatorarray__key_type.cpp
+++ b/doc/examples/operatorarray__key_type.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/operatorarray__key_type.link b/doc/examples/operatorarray__key_type.link
index 7990937b..82961705 100644
--- a/doc/examples/operatorarray__key_type.link
+++ b/doc/examples/operatorarray__key_type.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/4y25Szh3rTn8pQJg"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/iG5QR4oqgCLaEedf"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operatorarray__key_type_const.cpp b/doc/examples/operatorarray__key_type_const.cpp
index 36aa1db2..2320e439 100644
--- a/doc/examples/operatorarray__key_type_const.cpp
+++ b/doc/examples/operatorarray__key_type_const.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operatorarray__key_type_const.link b/doc/examples/operatorarray__key_type_const.link
index 3b6f2f4a..53a08924 100644
--- a/doc/examples/operatorarray__key_type_const.link
+++ b/doc/examples/operatorarray__key_type_const.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/KYhKymZiVPxCBzVc"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/Ee3J5N5Gn6ANooov"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operatorarray__size_type.cpp b/doc/examples/operatorarray__size_type.cpp
index 27d7d9ef..bc8ecb96 100644
--- a/doc/examples/operatorarray__size_type.cpp
+++ b/doc/examples/operatorarray__size_type.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operatorarray__size_type.link b/doc/examples/operatorarray__size_type.link
index e978214e..3e05678b 100644
--- a/doc/examples/operatorarray__size_type.link
+++ b/doc/examples/operatorarray__size_type.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/L1c3a41KITuzSwVS"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/21HxgPDhXEGvFC6C"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operatorarray__size_type_const.cpp b/doc/examples/operatorarray__size_type_const.cpp
index 44264172..ec9fc30f 100644
--- a/doc/examples/operatorarray__size_type_const.cpp
+++ b/doc/examples/operatorarray__size_type_const.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operatorarray__size_type_const.link b/doc/examples/operatorarray__size_type_const.link
index 3dc0ce3e..2eb1a380 100644
--- a/doc/examples/operatorarray__size_type_const.link
+++ b/doc/examples/operatorarray__size_type_const.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/O42CoAYuvKv9qsjI"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/IyS4nyuQg9OS8FaF"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operatorjson_pointer.cpp b/doc/examples/operatorjson_pointer.cpp
index 63b233d2..d4036673 100644
--- a/doc/examples/operatorjson_pointer.cpp
+++ b/doc/examples/operatorjson_pointer.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operatorjson_pointer.link b/doc/examples/operatorjson_pointer.link
index 67b3be46..92bf9d77 100644
--- a/doc/examples/operatorjson_pointer.link
+++ b/doc/examples/operatorjson_pointer.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/5BiKWmmo8E6cZ5ya"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/r7jZiTjekxAmg70w"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operatorjson_pointer_const.cpp b/doc/examples/operatorjson_pointer_const.cpp
index 8f3bc613..52b2a9e8 100644
--- a/doc/examples/operatorjson_pointer_const.cpp
+++ b/doc/examples/operatorjson_pointer_const.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/operatorjson_pointer_const.link b/doc/examples/operatorjson_pointer_const.link
index 38d54c6d..22a7c5cb 100644
--- a/doc/examples/operatorjson_pointer_const.link
+++ b/doc/examples/operatorjson_pointer_const.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/t2CPGGr35iE5Ccsd"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/MtaIF9fNY9WPXrUG"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/parse__array__parser_callback_t.cpp b/doc/examples/parse__array__parser_callback_t.cpp
index 790cc21d..5681178d 100644
--- a/doc/examples/parse__array__parser_callback_t.cpp
+++ b/doc/examples/parse__array__parser_callback_t.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/parse__array__parser_callback_t.link b/doc/examples/parse__array__parser_callback_t.link
index 76e50355..0830fdac 100644
--- a/doc/examples/parse__array__parser_callback_t.link
+++ b/doc/examples/parse__array__parser_callback_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/chPjGeanDIb5ce5Y"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/fs7n9Xh41pSIxK4g"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/parse__contiguouscontainer__parser_callback_t.cpp b/doc/examples/parse__contiguouscontainer__parser_callback_t.cpp
index c953fe67..ab551b0c 100644
--- a/doc/examples/parse__contiguouscontainer__parser_callback_t.cpp
+++ b/doc/examples/parse__contiguouscontainer__parser_callback_t.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/parse__contiguouscontainer__parser_callback_t.link b/doc/examples/parse__contiguouscontainer__parser_callback_t.link
index 27f6f961..1e65c1f0 100644
--- a/doc/examples/parse__contiguouscontainer__parser_callback_t.link
+++ b/doc/examples/parse__contiguouscontainer__parser_callback_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/6N1uGjyG56Cgp856"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/2cJ6aEoQItmXOyEe"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/parse__istream__parser_callback_t.cpp b/doc/examples/parse__istream__parser_callback_t.cpp
index 1d25f705..562ab968 100644
--- a/doc/examples/parse__istream__parser_callback_t.cpp
+++ b/doc/examples/parse__istream__parser_callback_t.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/parse__istream__parser_callback_t.link b/doc/examples/parse__istream__parser_callback_t.link
index f1552bf6..737c8dda 100644
--- a/doc/examples/parse__istream__parser_callback_t.link
+++ b/doc/examples/parse__istream__parser_callback_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/hRc62HHoix373ban"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/IvIGk03HXpuyv271"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/parse__iteratortype__parser_callback_t.cpp b/doc/examples/parse__iteratortype__parser_callback_t.cpp
index 1d752052..9a3e12e4 100644
--- a/doc/examples/parse__iteratortype__parser_callback_t.cpp
+++ b/doc/examples/parse__iteratortype__parser_callback_t.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/parse__iteratortype__parser_callback_t.link b/doc/examples/parse__iteratortype__parser_callback_t.link
index f48f2fd1..e49ebc8d 100644
--- a/doc/examples/parse__iteratortype__parser_callback_t.link
+++ b/doc/examples/parse__iteratortype__parser_callback_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/Tt8SS2LJXvi0fuUc"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/a8XRIpnVOQp3zYKV"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/parse__string__parser_callback_t.cpp b/doc/examples/parse__string__parser_callback_t.cpp
index b044eb32..ea02c330 100644
--- a/doc/examples/parse__string__parser_callback_t.cpp
+++ b/doc/examples/parse__string__parser_callback_t.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/parse__string__parser_callback_t.link b/doc/examples/parse__string__parser_callback_t.link
index 3b44d9dc..535ecd2b 100644
--- a/doc/examples/parse__string__parser_callback_t.link
+++ b/doc/examples/parse__string__parser_callback_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/Wvsf6dhxhscpNbx8"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/JZ8P4ruGJTLfOFHJ"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/patch.cpp b/doc/examples/patch.cpp
index ad30b78b..c844b970 100644
--- a/doc/examples/patch.cpp
+++ b/doc/examples/patch.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 #include <iomanip> // for std::setw
 
diff --git a/doc/examples/patch.link b/doc/examples/patch.link
index 93997149..7844cd94 100644
--- a/doc/examples/patch.link
+++ b/doc/examples/patch.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/UoObrzN9bFBGX8ph"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/U9n8nunch9ti8XlQ"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/push_back.cpp b/doc/examples/push_back.cpp
index 8d1b1c5e..7b0ec488 100644
--- a/doc/examples/push_back.cpp
+++ b/doc/examples/push_back.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/push_back.link b/doc/examples/push_back.link
index efb1b6bd..dc2b525e 100644
--- a/doc/examples/push_back.link
+++ b/doc/examples/push_back.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/Y6RwbyukIqP7axhL"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/nXx2jBB2mfhTui2x"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/push_back__initializer_list.cpp b/doc/examples/push_back__initializer_list.cpp
index 443c3639..d231e710 100644
--- a/doc/examples/push_back__initializer_list.cpp
+++ b/doc/examples/push_back__initializer_list.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/push_back__initializer_list.link b/doc/examples/push_back__initializer_list.link
index bb56fb16..f6796c25 100644
--- a/doc/examples/push_back__initializer_list.link
+++ b/doc/examples/push_back__initializer_list.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/EGWCBZOQQ4WbZl6V"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/Pkordpr08QOqwQ5S"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/push_back__object_t__value.cpp b/doc/examples/push_back__object_t__value.cpp
index fe3318c0..27215fb8 100644
--- a/doc/examples/push_back__object_t__value.cpp
+++ b/doc/examples/push_back__object_t__value.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/push_back__object_t__value.link b/doc/examples/push_back__object_t__value.link
index 0fad4a34..375315e4 100644
--- a/doc/examples/push_back__object_t__value.link
+++ b/doc/examples/push_back__object_t__value.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/OJH4Aq6qDiGRqXNo"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/YMP7YqusA4FVCXd8"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/rbegin.cpp b/doc/examples/rbegin.cpp
index c4f632eb..2e9824b4 100644
--- a/doc/examples/rbegin.cpp
+++ b/doc/examples/rbegin.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/rbegin.link b/doc/examples/rbegin.link
index a780148a..34174218 100644
--- a/doc/examples/rbegin.link
+++ b/doc/examples/rbegin.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/F9EE9JBnMu2KgCC3"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/ntIP2dRz12dM8cBi"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/rend.cpp b/doc/examples/rend.cpp
index d746ab4f..0c81da12 100644
--- a/doc/examples/rend.cpp
+++ b/doc/examples/rend.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/rend.link b/doc/examples/rend.link
index 9d33126d..7c9360bd 100644
--- a/doc/examples/rend.link
+++ b/doc/examples/rend.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/uv1nLqTKpZOwvofB"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/bwTPFmGISMU3mBoH"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/size.cpp b/doc/examples/size.cpp
index 34186499..07d1b6cd 100644
--- a/doc/examples/size.cpp
+++ b/doc/examples/size.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/size.link b/doc/examples/size.link
index 6b27e7b9..9042e08e 100644
--- a/doc/examples/size.link
+++ b/doc/examples/size.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/uBVNNjgvYuX7rcIO"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/a0lRgHqcBsG9bezj"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/swap__array_t.cpp b/doc/examples/swap__array_t.cpp
index b58c02c4..c83556ee 100644
--- a/doc/examples/swap__array_t.cpp
+++ b/doc/examples/swap__array_t.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/swap__array_t.link b/doc/examples/swap__array_t.link
index ed7862c8..7562e784 100644
--- a/doc/examples/swap__array_t.link
+++ b/doc/examples/swap__array_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/2aZmrP2xuWIiZOfd"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/vesMGROXLwOW7kTf"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/swap__object_t.cpp b/doc/examples/swap__object_t.cpp
index 15f061de..d67801c4 100644
--- a/doc/examples/swap__object_t.cpp
+++ b/doc/examples/swap__object_t.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/swap__object_t.link b/doc/examples/swap__object_t.link
index 6dd2dc18..cc6a18bb 100644
--- a/doc/examples/swap__object_t.link
+++ b/doc/examples/swap__object_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/cZGcQj8OrkPrXX9d"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/PnS7jOq2cgJMwm6w"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/swap__reference.cpp b/doc/examples/swap__reference.cpp
index ee033651..5223950c 100644
--- a/doc/examples/swap__reference.cpp
+++ b/doc/examples/swap__reference.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/swap__reference.link b/doc/examples/swap__reference.link
index 6bb80015..8c906769 100644
--- a/doc/examples/swap__reference.link
+++ b/doc/examples/swap__reference.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/BYPsq3iXyU04hqpi"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/XO1V5cnmK17G277z"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/swap__string_t.cpp b/doc/examples/swap__string_t.cpp
index 87ee1ed8..aeea028b 100644
--- a/doc/examples/swap__string_t.cpp
+++ b/doc/examples/swap__string_t.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/swap__string_t.link b/doc/examples/swap__string_t.link
index 5d204f86..29c2f9d0 100644
--- a/doc/examples/swap__string_t.link
+++ b/doc/examples/swap__string_t.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/jtBO4VQr09xU8hfX"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/SgGHz0fYGWTCFwCH"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/to_cbor.cpp b/doc/examples/to_cbor.cpp
index a4fbfbf1..bdffe5eb 100644
--- a/doc/examples/to_cbor.cpp
+++ b/doc/examples/to_cbor.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/to_cbor.link b/doc/examples/to_cbor.link
index 06695fec..ab658253 100644
--- a/doc/examples/to_cbor.link
+++ b/doc/examples/to_cbor.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/tMjlClOSnAhY0BDg"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/m6XKVQBrhB6jXGOe"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/to_msgpack.cpp b/doc/examples/to_msgpack.cpp
index 5e0d1884..7756a9e6 100644
--- a/doc/examples/to_msgpack.cpp
+++ b/doc/examples/to_msgpack.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/to_msgpack.link b/doc/examples/to_msgpack.link
index 904a6540..12014fb0 100644
--- a/doc/examples/to_msgpack.link
+++ b/doc/examples/to_msgpack.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/CeF2b7iKuvSnNZaV"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/b66iY9hOdCHEG8FV"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/type.cpp b/doc/examples/type.cpp
index eb764bf2..b712a852 100644
--- a/doc/examples/type.cpp
+++ b/doc/examples/type.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/type.link b/doc/examples/type.link
index c4d92739..3fedc680 100644
--- a/doc/examples/type.link
+++ b/doc/examples/type.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/om8MTJzY1FlDzxxS"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/zlWezYhiRTnLzrSj"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/type_name.cpp b/doc/examples/type_name.cpp
index b849c10a..470d0a65 100644
--- a/doc/examples/type_name.cpp
+++ b/doc/examples/type_name.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
diff --git a/doc/examples/type_name.link b/doc/examples/type_name.link
index 8f36e649..7f50a398 100644
--- a/doc/examples/type_name.link
+++ b/doc/examples/type_name.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/t8yj12vJog4NagqL"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/dKXdftLJYVnkE3Vg"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/unflatten.cpp b/doc/examples/unflatten.cpp
index f17e10ce..6318f859 100644
--- a/doc/examples/unflatten.cpp
+++ b/doc/examples/unflatten.cpp
@@ -1,5 +1,6 @@
-#include "json.hpp"
+#include <iostream>
 #include <iomanip> // for std::setw
+#include "json.hpp"
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/unflatten.link b/doc/examples/unflatten.link
index 71d3d55d..6caa6a57 100644
--- a/doc/examples/unflatten.link
+++ b/doc/examples/unflatten.link
@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/aOxMXevnLZteNqkg"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="https://wandbox.org/permlink/WKkNkEuGbsxPknyT"><b>online</b></a>
\ No newline at end of file