diff --git a/doc/examples/README.cpp b/doc/examples/README.cpp
index a424e195..b928e116 100644
--- a/doc/examples/README.cpp
+++ b/doc/examples/README.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/README.link b/doc/examples/README.link
index dab9343f..62671439 100644
--- a/doc/examples/README.link
+++ b/doc/examples/README.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/vsDHoEGWuGiwM0oh"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/y0porRuf7gTGQrIn"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/array.cpp b/doc/examples/array.cpp
index 106c47a1..3ec0a133 100644
--- a/doc/examples/array.cpp
+++ b/doc/examples/array.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/array.link b/doc/examples/array.link
index 2fa5d1dc..626dcd25 100644
--- a/doc/examples/array.link
+++ b/doc/examples/array.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/NeN8wmHsQGxFXC6L"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/TTykAqoDgbLzKxt3"><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 29c24c0c..a8fc9998 100644
--- a/doc/examples/at__object_t_key_type.cpp
+++ b/doc/examples/at__object_t_key_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/at__object_t_key_type.link b/doc/examples/at__object_t_key_type.link
index beba6a0f..f7e44b20 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="http://melpon.org/wandbox/permlink/3ir8W1OZ5KtbRz6r"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/wjOUJUwo2SO7q5u8"><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 4a335527..0686db45 100644
--- a/doc/examples/at__object_t_key_type_const.cpp
+++ b/doc/examples/at__object_t_key_type_const.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/at__object_t_key_type_const.link b/doc/examples/at__object_t_key_type_const.link
index 59ff8a90..8ba21166 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="http://melpon.org/wandbox/permlink/zwOKkXrKstDlMPjr"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/7gGtalpuoF4xE7VN"><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 617485bf..e31d61d3 100644
--- a/doc/examples/at__size_type.cpp
+++ b/doc/examples/at__size_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/at__size_type.link b/doc/examples/at__size_type.link
index a5ce10e4..76a409c2 100644
--- a/doc/examples/at__size_type.link
+++ b/doc/examples/at__size_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/9Ae4DO4HJjULnq5j"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Sa6XYQS7TJ5sGG8a"><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 8c4324d4..a8a43ed8 100644
--- a/doc/examples/at__size_type_const.cpp
+++ b/doc/examples/at__size_type_const.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/at__size_type_const.link b/doc/examples/at__size_type_const.link
index 663ee72e..5a1cdde9 100644
--- a/doc/examples/at__size_type_const.link
+++ b/doc/examples/at__size_type_const.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/Ti47m4DY2lV4SWNV"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/PGQOjyIV7s5YnsQM"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/back.cpp b/doc/examples/back.cpp
index 581d376d..20a2ecb6 100644
--- a/doc/examples/back.cpp
+++ b/doc/examples/back.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/back.link b/doc/examples/back.link
index 98bca5fe..1e075133 100644
--- a/doc/examples/back.link
+++ b/doc/examples/back.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/zB9tSkSVYIthfgj6"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/M9xQVJJLTE1qvTtm"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json.cpp b/doc/examples/basic_json.cpp
index ceb47c5e..0f36e4f8 100644
--- a/doc/examples/basic_json.cpp
+++ b/doc/examples/basic_json.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json.link b/doc/examples/basic_json.link
index f623a3cf..1625c487 100644
--- a/doc/examples/basic_json.link
+++ b/doc/examples/basic_json.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/Hrajl95QUa1Lplou"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/mSAAr3GATT6ciVjV"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__CompatibleArrayType.cpp b/doc/examples/basic_json__CompatibleArrayType.cpp
index e63529b6..bbbf5970 100644
--- a/doc/examples/basic_json__CompatibleArrayType.cpp
+++ b/doc/examples/basic_json__CompatibleArrayType.cpp
@@ -5,7 +5,7 @@
 #include <set>
 #include <unordered_set>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__CompatibleArrayType.link b/doc/examples/basic_json__CompatibleArrayType.link
index 52e8cae9..313ae3fe 100644
--- a/doc/examples/basic_json__CompatibleArrayType.link
+++ b/doc/examples/basic_json__CompatibleArrayType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/vyrjruntW4ASDBKH"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/InYach9gNBDvA8QR"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__CompatibleIntegerNumberType.cpp b/doc/examples/basic_json__CompatibleIntegerNumberType.cpp
index 7f6eb45d..50e751d1 100644
--- a/doc/examples/basic_json__CompatibleIntegerNumberType.cpp
+++ b/doc/examples/basic_json__CompatibleIntegerNumberType.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__CompatibleIntegerNumberType.link b/doc/examples/basic_json__CompatibleIntegerNumberType.link
index c1dba478..f994babb 100644
--- a/doc/examples/basic_json__CompatibleIntegerNumberType.link
+++ b/doc/examples/basic_json__CompatibleIntegerNumberType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/cyithYO7sPbXxK16"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/VDu3HkQPf0Rv5dzH"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__CompatibleNumberFloatType.cpp b/doc/examples/basic_json__CompatibleNumberFloatType.cpp
index 73adf78e..6f8d3f67 100644
--- a/doc/examples/basic_json__CompatibleNumberFloatType.cpp
+++ b/doc/examples/basic_json__CompatibleNumberFloatType.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__CompatibleNumberFloatType.link b/doc/examples/basic_json__CompatibleNumberFloatType.link
index aa10ad21..9e08b6a6 100644
--- a/doc/examples/basic_json__CompatibleNumberFloatType.link
+++ b/doc/examples/basic_json__CompatibleNumberFloatType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/yO6SWuP9bEYvNEvX"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/BjDrTHvJMwFC3iLr"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__CompatibleObjectType.cpp b/doc/examples/basic_json__CompatibleObjectType.cpp
index 8aa0dc73..d284b697 100644
--- a/doc/examples/basic_json__CompatibleObjectType.cpp
+++ b/doc/examples/basic_json__CompatibleObjectType.cpp
@@ -1,7 +1,7 @@
 #include <json.hpp>
 #include <unordered_map>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__CompatibleObjectType.link b/doc/examples/basic_json__CompatibleObjectType.link
index 3fe8de3a..6d65b17a 100644
--- a/doc/examples/basic_json__CompatibleObjectType.link
+++ b/doc/examples/basic_json__CompatibleObjectType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/FCiYtNwovQ84DWxl"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ZJz4SFD4Iuy8OS4T"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__CompatibleStringType.cpp b/doc/examples/basic_json__CompatibleStringType.cpp
index d9dc181a..a0f3b4f6 100644
--- a/doc/examples/basic_json__CompatibleStringType.cpp
+++ b/doc/examples/basic_json__CompatibleStringType.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__CompatibleStringType.link b/doc/examples/basic_json__CompatibleStringType.link
index 88406aed..2131a163 100644
--- a/doc/examples/basic_json__CompatibleStringType.link
+++ b/doc/examples/basic_json__CompatibleStringType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/h8c1hfORMnVrJ1Ky"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Fe1WNG7eJRaWYMM4"><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 a1fe0e5a..86a0faf8 100644
--- a/doc/examples/basic_json__InputIt_InputIt.cpp
+++ b/doc/examples/basic_json__InputIt_InputIt.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__InputIt_InputIt.link b/doc/examples/basic_json__InputIt_InputIt.link
index 6945986e..3ce3686a 100644
--- a/doc/examples/basic_json__InputIt_InputIt.link
+++ b/doc/examples/basic_json__InputIt_InputIt.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/z2P1DpA8uSSlwgTl"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Ulv0RYN6QoJ6ECVR"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__array_t.cpp b/doc/examples/basic_json__array_t.cpp
index 641c56e0..1bb6931b 100644
--- a/doc/examples/basic_json__array_t.cpp
+++ b/doc/examples/basic_json__array_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__array_t.link b/doc/examples/basic_json__array_t.link
index 6ea8193b..53322832 100644
--- a/doc/examples/basic_json__array_t.link
+++ b/doc/examples/basic_json__array_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/vwVgsv7w6YZUgctJ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/T5FlYwVpQ1oXBuBH"><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 c61827e9..28f1fd07 100644
--- a/doc/examples/basic_json__basic_json.cpp
+++ b/doc/examples/basic_json__basic_json.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__basic_json.link b/doc/examples/basic_json__basic_json.link
index 4853dde8..c3109d16 100644
--- a/doc/examples/basic_json__basic_json.link
+++ b/doc/examples/basic_json__basic_json.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/wwzBU7cK8Xr2yiKJ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/vPBv5smAPKUko4Qo"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__boolean_t.cpp b/doc/examples/basic_json__boolean_t.cpp
index cd6117c8..38f014e0 100644
--- a/doc/examples/basic_json__boolean_t.cpp
+++ b/doc/examples/basic_json__boolean_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__boolean_t.link b/doc/examples/basic_json__boolean_t.link
index 65606990..9fe211e4 100644
--- a/doc/examples/basic_json__boolean_t.link
+++ b/doc/examples/basic_json__boolean_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/RzWnqhbfuvbHXCBJ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/saCwetmQZaB8tQ24"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__const_int.cpp b/doc/examples/basic_json__const_int.cpp
index b0797f57..7e38544b 100644
--- a/doc/examples/basic_json__const_int.cpp
+++ b/doc/examples/basic_json__const_int.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__const_int.link b/doc/examples/basic_json__const_int.link
index 8df3800a..73d28628 100644
--- a/doc/examples/basic_json__const_int.link
+++ b/doc/examples/basic_json__const_int.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/BPk4vUc4kJPWX0rz"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/BzGFT02b2KTR6z2B"><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 977bd79d..9e9c2ecc 100644
--- a/doc/examples/basic_json__copyassignment.cpp
+++ b/doc/examples/basic_json__copyassignment.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__copyassignment.link b/doc/examples/basic_json__copyassignment.link
index 363e8ff6..96679cf4 100644
--- a/doc/examples/basic_json__copyassignment.link
+++ b/doc/examples/basic_json__copyassignment.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/P8QWpucrWhov8JRR"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Ib1A0jrFXwYhf0eA"><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 393c17ff..8734dff1 100644
--- a/doc/examples/basic_json__list_init_t.cpp
+++ b/doc/examples/basic_json__list_init_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__list_init_t.link b/doc/examples/basic_json__list_init_t.link
index 36a90228..5eca2050 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="http://melpon.org/wandbox/permlink/IWIZSNthuHrT3AS6"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/r7SIosyJCePZZvqh"><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 f73f8a5a..e470c95b 100644
--- a/doc/examples/basic_json__moveconstructor.cpp
+++ b/doc/examples/basic_json__moveconstructor.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__moveconstructor.link b/doc/examples/basic_json__moveconstructor.link
index 8fe8910c..88002bbd 100644
--- a/doc/examples/basic_json__moveconstructor.link
+++ b/doc/examples/basic_json__moveconstructor.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/dvTtz7DIo8TDhYE6"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/y7ngrkT74SN0fFWG"><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 f2f1a8c0..426afabc 100644
--- a/doc/examples/basic_json__nullptr_t.cpp
+++ b/doc/examples/basic_json__nullptr_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__nullptr_t.link b/doc/examples/basic_json__nullptr_t.link
index 3587d602..bb26af46 100644
--- a/doc/examples/basic_json__nullptr_t.link
+++ b/doc/examples/basic_json__nullptr_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/hcERmrPzjmXeSzB8"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Y7B27Mtrcp64PI9l"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__number_float_t.cpp b/doc/examples/basic_json__number_float_t.cpp
index 88403231..92533b7d 100644
--- a/doc/examples/basic_json__number_float_t.cpp
+++ b/doc/examples/basic_json__number_float_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__number_float_t.link b/doc/examples/basic_json__number_float_t.link
index c5a320a7..a7c6b607 100644
--- a/doc/examples/basic_json__number_float_t.link
+++ b/doc/examples/basic_json__number_float_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/47cqX7AduSWn24lA"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/rsIsQEvaeJEaJx9c"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__number_integer_t.cpp b/doc/examples/basic_json__number_integer_t.cpp
index a40dd3e8..1078f360 100644
--- a/doc/examples/basic_json__number_integer_t.cpp
+++ b/doc/examples/basic_json__number_integer_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__number_integer_t.link b/doc/examples/basic_json__number_integer_t.link
index eb89983a..764aa649 100644
--- a/doc/examples/basic_json__number_integer_t.link
+++ b/doc/examples/basic_json__number_integer_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/RUSNdk5YEAr2vL4E"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/3aV9OONj8OfHPXBV"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__object_t.cpp b/doc/examples/basic_json__object_t.cpp
index 0a296d1a..39e2fcc0 100644
--- a/doc/examples/basic_json__object_t.cpp
+++ b/doc/examples/basic_json__object_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__object_t.link b/doc/examples/basic_json__object_t.link
index dbe9e78e..f6bad665 100644
--- a/doc/examples/basic_json__object_t.link
+++ b/doc/examples/basic_json__object_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/4IF0ofRq0nZcV8pI"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/YhDZ1WhldMdwBthI"><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 1774366d..15f8c0d5 100644
--- a/doc/examples/basic_json__size_type_basic_json.cpp
+++ b/doc/examples/basic_json__size_type_basic_json.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__size_type_basic_json.link b/doc/examples/basic_json__size_type_basic_json.link
index 349d423d..6ae76b6f 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="http://melpon.org/wandbox/permlink/dkznQmTMqulurCqD"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/OTJ7W8jL7z9qQlkL"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__string_t.cpp b/doc/examples/basic_json__string_t.cpp
index 97d3c943..3205f623 100644
--- a/doc/examples/basic_json__string_t.cpp
+++ b/doc/examples/basic_json__string_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__string_t.link b/doc/examples/basic_json__string_t.link
index e3f988fc..a5051e58 100644
--- a/doc/examples/basic_json__string_t.link
+++ b/doc/examples/basic_json__string_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/S9jwK28ThNIGkdUI"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ZRv2SsnLGdLzBhFO"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__string_t_value_type.cpp b/doc/examples/basic_json__string_t_value_type.cpp
index 15bf39f1..5379ca06 100644
--- a/doc/examples/basic_json__string_t_value_type.cpp
+++ b/doc/examples/basic_json__string_t_value_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__string_t_value_type.link b/doc/examples/basic_json__string_t_value_type.link
index f85b8236..4646b5b2 100644
--- a/doc/examples/basic_json__string_t_value_type.link
+++ b/doc/examples/basic_json__string_t_value_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/xNtouqvB2OJBOwkv"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/xttjHgaxVqpfriXz"><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 37081791..dfb91d84 100644
--- a/doc/examples/basic_json__value.cpp
+++ b/doc/examples/basic_json__value.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__value.link b/doc/examples/basic_json__value.link
index 6698c891..452a1fe4 100644
--- a/doc/examples/basic_json__value.link
+++ b/doc/examples/basic_json__value.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/pehnjdIduvv90qfX"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ejZBeBBPEBmYsPFz"><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 c36e0e51..faf5dfae 100644
--- a/doc/examples/basic_json__value_t.cpp
+++ b/doc/examples/basic_json__value_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__value_t.link b/doc/examples/basic_json__value_t.link
index 9d8b0633..774aaa25 100644
--- a/doc/examples/basic_json__value_t.link
+++ b/doc/examples/basic_json__value_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/ncOG8fdxNrISUNFj"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/fkrZveuulCw95PXF"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/begin.cpp b/doc/examples/begin.cpp
index f6b1b1e4..46c17218 100644
--- a/doc/examples/begin.cpp
+++ b/doc/examples/begin.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/begin.link b/doc/examples/begin.link
index 5db4ca8d..6a76a588 100644
--- a/doc/examples/begin.link
+++ b/doc/examples/begin.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/Nwb94PEGlvnjrqj1"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/9HE53y23Ldu1xzQU"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/cbegin.cpp b/doc/examples/cbegin.cpp
index 43a11939..fe45e49b 100644
--- a/doc/examples/cbegin.cpp
+++ b/doc/examples/cbegin.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/cbegin.link b/doc/examples/cbegin.link
index fcbe5f2b..83c75dd3 100644
--- a/doc/examples/cbegin.link
+++ b/doc/examples/cbegin.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/mWrMi5IrJjRILgir"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/8rGgyscFrA1fCiIn"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/cend.cpp b/doc/examples/cend.cpp
index f796c905..a140fb0b 100644
--- a/doc/examples/cend.cpp
+++ b/doc/examples/cend.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/cend.link b/doc/examples/cend.link
index 60ba8441..acca215d 100644
--- a/doc/examples/cend.link
+++ b/doc/examples/cend.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/0OHrFwFGvRuDKdfx"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Zek4QM4kvKLUywGC"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/clear.cpp b/doc/examples/clear.cpp
index dcd3cc79..60016753 100644
--- a/doc/examples/clear.cpp
+++ b/doc/examples/clear.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/clear.link b/doc/examples/clear.link
index 5a34bf9f..8defa668 100644
--- a/doc/examples/clear.link
+++ b/doc/examples/clear.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/Ddggfbg18WXOIBkW"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/D6RJMyjkibQmKUC4"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/count.cpp b/doc/examples/count.cpp
index cf679644..a805eeb6 100644
--- a/doc/examples/count.cpp
+++ b/doc/examples/count.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/count.link b/doc/examples/count.link
index ef883539..e13caf36 100644
--- a/doc/examples/count.link
+++ b/doc/examples/count.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/mPQHwiNeVa872Aky"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/GFOaqTzQCZeTQk3R"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/crbegin.cpp b/doc/examples/crbegin.cpp
index b36692fa..4ea71d97 100644
--- a/doc/examples/crbegin.cpp
+++ b/doc/examples/crbegin.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/crbegin.link b/doc/examples/crbegin.link
index ad4fbeb9..27de8eb8 100644
--- a/doc/examples/crbegin.link
+++ b/doc/examples/crbegin.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/XA8jRF4u0UBKMVKT"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ZVFFzaSjRzx81O7o"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/crend.cpp b/doc/examples/crend.cpp
index d61804e8..079eeea6 100644
--- a/doc/examples/crend.cpp
+++ b/doc/examples/crend.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/crend.link b/doc/examples/crend.link
index a691504a..c678236d 100644
--- a/doc/examples/crend.link
+++ b/doc/examples/crend.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/XHuFmdmwqZ7Tdw2U"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/EmWt4iCaVbSmTxUs"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/dump.cpp b/doc/examples/dump.cpp
index 962e4008..3145d453 100644
--- a/doc/examples/dump.cpp
+++ b/doc/examples/dump.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/dump.link b/doc/examples/dump.link
index d6470d44..35ef4653 100644
--- a/doc/examples/dump.link
+++ b/doc/examples/dump.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/tkZFGPekIFMEQYY0"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/PjtHNsrmmgEeCFVp"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/empty.cpp b/doc/examples/empty.cpp
index 0da27d27..2edda6dc 100644
--- a/doc/examples/empty.cpp
+++ b/doc/examples/empty.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/empty.link b/doc/examples/empty.link
index 8b885b03..fd22770c 100644
--- a/doc/examples/empty.link
+++ b/doc/examples/empty.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/8vK2Qdo2tJk3loVq"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/daiGc21CilMsU7ln"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/end.cpp b/doc/examples/end.cpp
index 11a65575..848623a4 100644
--- a/doc/examples/end.cpp
+++ b/doc/examples/end.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/end.link b/doc/examples/end.link
index 4f9ce01d..260696d5 100644
--- a/doc/examples/end.link
+++ b/doc/examples/end.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/PTRnmRsywWUoknqU"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/7QIAVTX9fvOkHUrH"><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 3c02bbff..5743c327 100644
--- a/doc/examples/erase__IteratorType.cpp
+++ b/doc/examples/erase__IteratorType.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/erase__IteratorType.link b/doc/examples/erase__IteratorType.link
index e1a133a0..b523066e 100644
--- a/doc/examples/erase__IteratorType.link
+++ b/doc/examples/erase__IteratorType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/iqtEFeReXatgjqHy"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/DlwzEWGJkvmikaNi"><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 a5bde58b..9250c3ca 100644
--- a/doc/examples/erase__IteratorType_IteratorType.cpp
+++ b/doc/examples/erase__IteratorType_IteratorType.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/erase__IteratorType_IteratorType.link b/doc/examples/erase__IteratorType_IteratorType.link
index c1479769..b7f3da72 100644
--- a/doc/examples/erase__IteratorType_IteratorType.link
+++ b/doc/examples/erase__IteratorType_IteratorType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/4ZSaQAFaqyN8Vhop"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ds4TH3IAYVLCGyIz"><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 a1d1e44d..ca0962aa 100644
--- a/doc/examples/erase__key_type.cpp
+++ b/doc/examples/erase__key_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/erase__key_type.link b/doc/examples/erase__key_type.link
index 4ab5bb61..bef018ca 100644
--- a/doc/examples/erase__key_type.link
+++ b/doc/examples/erase__key_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/vQ4ipI1dlW8IZhNh"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/h6FfQqA0UIqdG6ca"><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 8578660e..7df3d062 100644
--- a/doc/examples/erase__size_type.cpp
+++ b/doc/examples/erase__size_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/erase__size_type.link b/doc/examples/erase__size_type.link
index 1a4bbfdd..fe2d560d 100644
--- a/doc/examples/erase__size_type.link
+++ b/doc/examples/erase__size_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/foNekpKoDDTEfKuy"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Fg7ut6CV4YBCsDbQ"><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 214fe53f..79eed509 100644
--- a/doc/examples/find__key_type.cpp
+++ b/doc/examples/find__key_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/find__key_type.link b/doc/examples/find__key_type.link
index 68beedbe..2bc0512d 100644
--- a/doc/examples/find__key_type.link
+++ b/doc/examples/find__key_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/q5oRles9a6IgEOkD"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/BfABW7AMVl4xqeoJ"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/front.cpp b/doc/examples/front.cpp
index 8ed35764..a29d33ef 100644
--- a/doc/examples/front.cpp
+++ b/doc/examples/front.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/front.link b/doc/examples/front.link
index 2821f00d..32d4a19b 100644
--- a/doc/examples/front.link
+++ b/doc/examples/front.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/OvihNTNV4XPwoSw8"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/NH4F08xGiQfNT71r"><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 ed77d7b0..7c15c5aa 100644
--- a/doc/examples/get__PointerType.cpp
+++ b/doc/examples/get__PointerType.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/get__PointerType.link b/doc/examples/get__PointerType.link
index 7dd011cb..a811b26d 100644
--- a/doc/examples/get__PointerType.link
+++ b/doc/examples/get__PointerType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/OQ6W9gVosCWDgJHS"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/iunIxpTIIy6vcWJZ"><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 3ccba548..40a96184 100644
--- a/doc/examples/get__ValueType_const.cpp
+++ b/doc/examples/get__ValueType_const.cpp
@@ -1,7 +1,7 @@
 #include <json.hpp>
 #include <unordered_map>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/get__ValueType_const.link b/doc/examples/get__ValueType_const.link
index 0969939c..fce774b2 100644
--- a/doc/examples/get__ValueType_const.link
+++ b/doc/examples/get__ValueType_const.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/4OkGAXhiCsa1E5Jx"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/7k9830oUxfGndWzT"><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 2a3d974a..2c319dc4 100644
--- a/doc/examples/get_ptr.cpp
+++ b/doc/examples/get_ptr.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/get_ptr.link b/doc/examples/get_ptr.link
index 265ebb04..e318d778 100644
--- a/doc/examples/get_ptr.link
+++ b/doc/examples/get_ptr.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/Onaz3FY3sow5TEwH"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/NDeUS78poIDrGhIP"><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 c73cff3e..d0ddb2d2 100644
--- a/doc/examples/get_ref.cpp
+++ b/doc/examples/get_ref.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/get_ref.link b/doc/examples/get_ref.link
index 4c8fd69a..c0d8275a 100644
--- a/doc/examples/get_ref.link
+++ b/doc/examples/get_ref.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/nBNBANVonG9HCQqQ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/5IINd4ZXCINhlk8u"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/insert.cpp b/doc/examples/insert.cpp
index c7adfc5a..967f443e 100644
--- a/doc/examples/insert.cpp
+++ b/doc/examples/insert.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/insert.link b/doc/examples/insert.link
index 80ec801c..3886e04d 100644
--- a/doc/examples/insert.link
+++ b/doc/examples/insert.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/s0562du3uk9eMpos"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/814P5z0lA90nVh8b"><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 cfdb39b6..258515e6 100644
--- a/doc/examples/insert__count.cpp
+++ b/doc/examples/insert__count.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/insert__count.link b/doc/examples/insert__count.link
index 3c0e781c..b97d0d69 100644
--- a/doc/examples/insert__count.link
+++ b/doc/examples/insert__count.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/kZCcDOrWRsmOCjOn"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/OG3x3F7DFoqtHyqh"><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 02d83dae..c0138d2a 100644
--- a/doc/examples/insert__ilist.cpp
+++ b/doc/examples/insert__ilist.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/insert__ilist.link b/doc/examples/insert__ilist.link
index b7bfd25a..4920588b 100644
--- a/doc/examples/insert__ilist.link
+++ b/doc/examples/insert__ilist.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/ciOQKs1KoHMSAWN3"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/6gMuEfviD6ijflgd"><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 03ea0bc3..b5d0001b 100644
--- a/doc/examples/insert__range.cpp
+++ b/doc/examples/insert__range.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/insert__range.link b/doc/examples/insert__range.link
index 03c5d012..ac773f8b 100644
--- a/doc/examples/insert__range.link
+++ b/doc/examples/insert__range.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/lZeC91nMjP3Npmx7"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/pUKVc892loGnjxUL"><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 c436f38f..11a63115 100644
--- a/doc/examples/is_array.cpp
+++ b/doc/examples/is_array.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_array.link b/doc/examples/is_array.link
index 4d5fdb07..8c8b9f82 100644
--- a/doc/examples/is_array.link
+++ b/doc/examples/is_array.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/NTSNuQecVsmv3guC"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/0jJBJgku6NLIxJfv"><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 24511a2f..9efcf694 100644
--- a/doc/examples/is_boolean.cpp
+++ b/doc/examples/is_boolean.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_boolean.link b/doc/examples/is_boolean.link
index 5fda3d0a..62f5fed1 100644
--- a/doc/examples/is_boolean.link
+++ b/doc/examples/is_boolean.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/3ZOet3bImwKg2vMb"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/chWkSIROaePvwcDq"><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 7f6c8c07..a1d42a7a 100644
--- a/doc/examples/is_discarded.cpp
+++ b/doc/examples/is_discarded.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_discarded.link b/doc/examples/is_discarded.link
index 5f58643d..7ce69a10 100644
--- a/doc/examples/is_discarded.link
+++ b/doc/examples/is_discarded.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/a0c6rKo8VbeOBAmD"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/j10gcmatdR8o625C"><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 d6a6de4c..0d69c05c 100644
--- a/doc/examples/is_null.cpp
+++ b/doc/examples/is_null.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_null.link b/doc/examples/is_null.link
index 39c5d261..6b22b978 100644
--- a/doc/examples/is_null.link
+++ b/doc/examples/is_null.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/z9pBPy4eSYMCZgEr"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/rnEIZwD2AvtjaEzo"><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 29c21ffb..fd2a99b1 100644
--- a/doc/examples/is_number.cpp
+++ b/doc/examples/is_number.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_number.link b/doc/examples/is_number.link
index 090b5ca9..bf863a1c 100644
--- a/doc/examples/is_number.link
+++ b/doc/examples/is_number.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/1rel3xdea4ADiKds"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ZyMWRbD7gH5eC5Xy"><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 289428c3..92bcfa10 100644
--- a/doc/examples/is_number_float.cpp
+++ b/doc/examples/is_number_float.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_number_float.link b/doc/examples/is_number_float.link
index 7ed76760..38abb598 100644
--- a/doc/examples/is_number_float.link
+++ b/doc/examples/is_number_float.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/vEZZNyL8GPbAfAsJ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ouIIgi0X3Te9upBj"><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 d7a38b6a..ecac7cd6 100644
--- a/doc/examples/is_number_integer.cpp
+++ b/doc/examples/is_number_integer.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_number_integer.link b/doc/examples/is_number_integer.link
index fae1ef43..d6162ab0 100644
--- a/doc/examples/is_number_integer.link
+++ b/doc/examples/is_number_integer.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/bulo75cZB0cPINgL"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/jZwJVIXretvfg4kS"><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 185d93de..ad457591 100644
--- a/doc/examples/is_number_unsigned.cpp
+++ b/doc/examples/is_number_unsigned.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_number_unsigned.link b/doc/examples/is_number_unsigned.link
index 1877ced9..41986cef 100644
--- a/doc/examples/is_number_unsigned.link
+++ b/doc/examples/is_number_unsigned.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/h4s4VitQ3VmCOEXr"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Vd3c1gtskokcJHp7"><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 b85253a3..56db66e5 100644
--- a/doc/examples/is_object.cpp
+++ b/doc/examples/is_object.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_object.link b/doc/examples/is_object.link
index 549bc0c0..1a304d09 100644
--- a/doc/examples/is_object.link
+++ b/doc/examples/is_object.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/40lrBaplftujclBr"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ivLUeazmkk6aCUkE"><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 3f45b95a..48872ab5 100644
--- a/doc/examples/is_primitive.cpp
+++ b/doc/examples/is_primitive.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_primitive.link b/doc/examples/is_primitive.link
index 27167a3a..eb73ffb1 100644
--- a/doc/examples/is_primitive.link
+++ b/doc/examples/is_primitive.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/zZYJHMvzYyYkNoAU"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/9qjfclmdmZrCnVR3"><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 6020fb66..2d6ed069 100644
--- a/doc/examples/is_string.cpp
+++ b/doc/examples/is_string.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_string.link b/doc/examples/is_string.link
index 1e8d54fa..6af78b0b 100644
--- a/doc/examples/is_string.link
+++ b/doc/examples/is_string.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/1x7B5XrHtV8RTROC"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Uh60XVyyG1N5pL2n"><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 40a7cb33..ed573e3c 100644
--- a/doc/examples/is_structured.cpp
+++ b/doc/examples/is_structured.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_structured.link b/doc/examples/is_structured.link
index 6cc3c9bb..8ae6fd04 100644
--- a/doc/examples/is_structured.link
+++ b/doc/examples/is_structured.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/kXpxIk6MP6OxEvwu"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/QH2PmyggbFbaA8Dg"><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 b5537c67..d2f1b727 100644
--- a/doc/examples/max_size.cpp
+++ b/doc/examples/max_size.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/max_size.link b/doc/examples/max_size.link
index 88752ae7..d91bc8cd 100644
--- a/doc/examples/max_size.link
+++ b/doc/examples/max_size.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/RLNomTjexFIzyUx4"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/pHK8lxPJaR0LZwRM"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/object.cpp b/doc/examples/object.cpp
index a4f9b4a2..54f3ca3b 100644
--- a/doc/examples/object.cpp
+++ b/doc/examples/object.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/object.link b/doc/examples/object.link
index b41ff5a3..575473b3 100644
--- a/doc/examples/object.link
+++ b/doc/examples/object.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/wArBhgANa8p39v92"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/g46YJ0TCAELXYvZb"><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 962b4bf6..9307e69b 100644
--- a/doc/examples/operator__ValueType.cpp
+++ b/doc/examples/operator__ValueType.cpp
@@ -1,7 +1,7 @@
 #include <json.hpp>
 #include <unordered_map>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__ValueType.link b/doc/examples/operator__ValueType.link
index cc28e01f..204d8f5e 100644
--- a/doc/examples/operator__ValueType.link
+++ b/doc/examples/operator__ValueType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/PK8Jc2HcZ1MdHOFH"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/laFGVm1oHwhEIiJl"><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 e40dc964..12bf92ed 100644
--- a/doc/examples/operator__equal.cpp
+++ b/doc/examples/operator__equal.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__equal.link b/doc/examples/operator__equal.link
index 28e82044..41ae20ce 100644
--- a/doc/examples/operator__equal.link
+++ b/doc/examples/operator__equal.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/a74tSggkWP5Zo0Ee"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Zpc5xccVHh210pJ4"><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 f3ce2fe2..49c632cf 100644
--- a/doc/examples/operator__equal__nullptr_t.cpp
+++ b/doc/examples/operator__equal__nullptr_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__equal__nullptr_t.link b/doc/examples/operator__equal__nullptr_t.link
index 0ddbd47e..49e46fd6 100644
--- a/doc/examples/operator__equal__nullptr_t.link
+++ b/doc/examples/operator__equal__nullptr_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/gXAi4IhfawcmtX6v"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Y7k4oKr0qq2C1m6Q"><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 bd78b0ce..bee3b2b5 100644
--- a/doc/examples/operator__greater.cpp
+++ b/doc/examples/operator__greater.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__greater.link b/doc/examples/operator__greater.link
index 5b13ba11..2299d610 100644
--- a/doc/examples/operator__greater.link
+++ b/doc/examples/operator__greater.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/TZmhplJw3tl08RFN"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/FsDUutWOyZiFDADV"><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 df73b515..cd398966 100644
--- a/doc/examples/operator__greaterequal.cpp
+++ b/doc/examples/operator__greaterequal.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__greaterequal.link b/doc/examples/operator__greaterequal.link
index 76203276..fdd676e6 100644
--- a/doc/examples/operator__greaterequal.link
+++ b/doc/examples/operator__greaterequal.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/clvCFZxlFEerhtk8"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/EGB8bgj4XZ1QDdoG"><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 68afac04..d4a7b794 100644
--- a/doc/examples/operator__less.cpp
+++ b/doc/examples/operator__less.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__less.link b/doc/examples/operator__less.link
index 949c3f83..5d7f6f56 100644
--- a/doc/examples/operator__less.link
+++ b/doc/examples/operator__less.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/85XpxnwbJZR1PVtz"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/4UPUe8lpV9e48paC"><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 98f99b4d..20654d9e 100644
--- a/doc/examples/operator__lessequal.cpp
+++ b/doc/examples/operator__lessequal.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__lessequal.link b/doc/examples/operator__lessequal.link
index 8e2c58aa..620b6aa8 100644
--- a/doc/examples/operator__lessequal.link
+++ b/doc/examples/operator__lessequal.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/JYP6JpBzl8Q9xQDZ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/D1CUYI3AqEozXpjh"><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 27182b25..499a00d1 100644
--- a/doc/examples/operator__notequal.cpp
+++ b/doc/examples/operator__notequal.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__notequal.link b/doc/examples/operator__notequal.link
index 6a9d08f5..482b9721 100644
--- a/doc/examples/operator__notequal.link
+++ b/doc/examples/operator__notequal.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/csiUCov9Mquff3ZZ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/AVJ7PQO6te3sC6kp"><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 9a740d5d..014e6343 100644
--- a/doc/examples/operator__notequal__nullptr_t.cpp
+++ b/doc/examples/operator__notequal__nullptr_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__notequal__nullptr_t.link b/doc/examples/operator__notequal__nullptr_t.link
index 4d6ad55f..40f6bb4f 100644
--- a/doc/examples/operator__notequal__nullptr_t.link
+++ b/doc/examples/operator__notequal__nullptr_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/yfp2fEHkXCZSenTX"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/E0Hu2nk9YvMUW1ck"><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 39d85a69..d281df0d 100644
--- a/doc/examples/operator__value_t.cpp
+++ b/doc/examples/operator__value_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__value_t.link b/doc/examples/operator__value_t.link
index 36b32318..a9707232 100644
--- a/doc/examples/operator__value_t.link
+++ b/doc/examples/operator__value_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/OTJgTuHDjzQlrONB"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/qt8t1mE1LjXjtBtO"><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 af82c74e..a43cdf0f 100644
--- a/doc/examples/operator_deserialize.cpp
+++ b/doc/examples/operator_deserialize.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator_deserialize.link b/doc/examples/operator_deserialize.link
index 3b605151..27e998d9 100644
--- a/doc/examples/operator_deserialize.link
+++ b/doc/examples/operator_deserialize.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/q0DrCAa87X0xR7vu"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Q4f0uwIQWvnheKCb"><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 2531064e..c1568d99 100644
--- a/doc/examples/operator_serialize.cpp
+++ b/doc/examples/operator_serialize.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator_serialize.link b/doc/examples/operator_serialize.link
index 558c0738..231306ac 100644
--- a/doc/examples/operator_serialize.link
+++ b/doc/examples/operator_serialize.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/t8kFPBs2j2mN6VBc"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/c5XBX38eOBEz5Xkw"><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 6050dc12..e83a2ac0 100644
--- a/doc/examples/operatorarray__key_type.cpp
+++ b/doc/examples/operatorarray__key_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operatorarray__key_type.link b/doc/examples/operatorarray__key_type.link
index 1dfa0cc0..40df071b 100644
--- a/doc/examples/operatorarray__key_type.link
+++ b/doc/examples/operatorarray__key_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/NjX5TeaQdGHer7Xu"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ibp0eDm8dPhHEsSB"><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 a59cca58..5ad97355 100644
--- a/doc/examples/operatorarray__key_type_const.cpp
+++ b/doc/examples/operatorarray__key_type_const.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operatorarray__key_type_const.link b/doc/examples/operatorarray__key_type_const.link
index 7e740a1b..bba664a5 100644
--- a/doc/examples/operatorarray__key_type_const.link
+++ b/doc/examples/operatorarray__key_type_const.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/4WLxv7id8P64Q1KI"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/pHB8PKHjuFOesfMM"><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 70a7d562..4ccbf270 100644
--- a/doc/examples/operatorarray__size_type.cpp
+++ b/doc/examples/operatorarray__size_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operatorarray__size_type.link b/doc/examples/operatorarray__size_type.link
index 050f86f6..b9d57881 100644
--- a/doc/examples/operatorarray__size_type.link
+++ b/doc/examples/operatorarray__size_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/x5eACUyqALnEmtJa"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/KUCir2gm6mh39HNy"><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 d99d8c5d..2ef79478 100644
--- a/doc/examples/operatorarray__size_type_const.cpp
+++ b/doc/examples/operatorarray__size_type_const.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operatorarray__size_type_const.link b/doc/examples/operatorarray__size_type_const.link
index ef0eec4f..a1f8c98b 100644
--- a/doc/examples/operatorarray__size_type_const.link
+++ b/doc/examples/operatorarray__size_type_const.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/eyDuHRe4RnWdGv2o"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/KGERZ2Wgb9dpt4V0"><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 85805310..6812a5e2 100644
--- a/doc/examples/parse__istream__parser_callback_t.cpp
+++ b/doc/examples/parse__istream__parser_callback_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/parse__istream__parser_callback_t.link b/doc/examples/parse__istream__parser_callback_t.link
index 36aee856..85960e15 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="http://melpon.org/wandbox/permlink/2ZxOGwFs5YLdSOlG"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/9Maolv5LJQM9pbqb"><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 52fecbff..62982ca6 100644
--- a/doc/examples/parse__string__parser_callback_t.cpp
+++ b/doc/examples/parse__string__parser_callback_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/parse__string__parser_callback_t.link b/doc/examples/parse__string__parser_callback_t.link
index f92ef4b6..9db1c3b8 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="http://melpon.org/wandbox/permlink/XD9GkEmVZI9ecPEL"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/rleJPtEaWVJ9oBAn"><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 8599999c..5d0877f0 100644
--- a/doc/examples/push_back.cpp
+++ b/doc/examples/push_back.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/push_back.link b/doc/examples/push_back.link
index a1781b84..8ec17dba 100644
--- a/doc/examples/push_back.link
+++ b/doc/examples/push_back.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/5ZglUDvkQ0VxYxQ4"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/NDbzJ3aIWcJCtyQj"><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 92f1c210..b55ee640 100644
--- a/doc/examples/push_back__object_t__value.cpp
+++ b/doc/examples/push_back__object_t__value.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/push_back__object_t__value.link b/doc/examples/push_back__object_t__value.link
index 4744be03..24882e38 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="http://melpon.org/wandbox/permlink/xtErbxTG2iIC5wHh"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/PbG1Ox3wbWO5M2n0"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/rbegin.cpp b/doc/examples/rbegin.cpp
index 58514b73..2ced56d3 100644
--- a/doc/examples/rbegin.cpp
+++ b/doc/examples/rbegin.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/rbegin.link b/doc/examples/rbegin.link
index 69e5aaa2..de269d74 100644
--- a/doc/examples/rbegin.link
+++ b/doc/examples/rbegin.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/qVpSdd1SQJeMkVQQ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/61XbPi0WzoFMwGOC"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/rend.cpp b/doc/examples/rend.cpp
index 319a75c1..ece1c551 100644
--- a/doc/examples/rend.cpp
+++ b/doc/examples/rend.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/rend.link b/doc/examples/rend.link
index e8c43daf..17faa911 100644
--- a/doc/examples/rend.link
+++ b/doc/examples/rend.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/7oaTSGkGGPAiGxSU"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/1jdSpDY9sGkVXNXf"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/size.cpp b/doc/examples/size.cpp
index db012861..5949ed63 100644
--- a/doc/examples/size.cpp
+++ b/doc/examples/size.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/size.link b/doc/examples/size.link
index e8224604..4cc0afa1 100644
--- a/doc/examples/size.link
+++ b/doc/examples/size.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/GozebkNWdjby4a8N"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/EbP2syhcIlnzaVgg"><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 e9716183..3c2cc6b7 100644
--- a/doc/examples/swap__array_t.cpp
+++ b/doc/examples/swap__array_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/swap__array_t.link b/doc/examples/swap__array_t.link
index 5afa09c9..8851fdb9 100644
--- a/doc/examples/swap__array_t.link
+++ b/doc/examples/swap__array_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/qHbCdOUwZK6INFH8"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Dm8mklPRNsWM9jDG"><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 aaed2fc4..d3a0bae2 100644
--- a/doc/examples/swap__object_t.cpp
+++ b/doc/examples/swap__object_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/swap__object_t.link b/doc/examples/swap__object_t.link
index 6063f815..8bd7495e 100644
--- a/doc/examples/swap__object_t.link
+++ b/doc/examples/swap__object_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/g5pkLUCrBVoNPRyE"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/oTEHCv1zOE5n03v8"><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 4c03cc01..178a60be 100644
--- a/doc/examples/swap__reference.cpp
+++ b/doc/examples/swap__reference.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/swap__reference.link b/doc/examples/swap__reference.link
index 7f834590..3ee4c0df 100644
--- a/doc/examples/swap__reference.link
+++ b/doc/examples/swap__reference.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/TKgXGJF9Cr5TXabd"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/HUBPhdgANUGiBEWp"><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 4922f7c9..af166849 100644
--- a/doc/examples/swap__string_t.cpp
+++ b/doc/examples/swap__string_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/swap__string_t.link b/doc/examples/swap__string_t.link
index 15d703e2..71931369 100644
--- a/doc/examples/swap__string_t.link
+++ b/doc/examples/swap__string_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/UsEo3yK2GsjH8CyA"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/BBJAr8uCd2ru1ODN"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/type.cpp b/doc/examples/type.cpp
index e5a38ea8..07ec7885 100644
--- a/doc/examples/type.cpp
+++ b/doc/examples/type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/type.link b/doc/examples/type.link
index acd8cbfb..f197d847 100644
--- a/doc/examples/type.link
+++ b/doc/examples/type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/bYygSYwOFyTzN2Py"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ZfaJtrNZiwyke1M8"><b>online</b></a>
\ No newline at end of file