added examples

doc/examples/at_json_pointer.cpp

@@ -0,0 +1,35 @@
+#include <json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON value
+    json j =
+    {
+        {"number", 1}, {"string", "foo"}, {"array", {1, 2}}
+    };
+
+    // read-only access
+
+    // output element with JSON pointer "/number"
+    std::cout << j.at("/number"_json_pointer) << '\n';
+    // output element with JSON pointer "/string"
+    std::cout << j.at("/string"_json_pointer) << '\n';
+    // output element with JSON pointer "/array"
+    std::cout << j.at("/array"_json_pointer) << '\n';
+    // output element with JSON pointer "/array/1"
+    std::cout << j.at("/array/1"_json_pointer) << '\n';
+
+    // writing access
+
+    // change the string
+    j.at("/string"_json_pointer) = "bar";
+    // output the changed string
+    std::cout << j["string"] << '\n';
+
+    // change an array element
+    j.at("/array/1"_json_pointer) = 21;
+    // output the changed array
+    std::cout << j["array"] << '\n';
+}

doc/examples/at_json_pointer.link

@@ -0,0 +1 @@
+<a target="_blank" href="http://melpon.org/wandbox/permlink/dGjf71qpuaptNhpP"><b>online</b></a>

doc/examples/at_json_pointer.output

@@ -0,0 +1,6 @@
+1
+"foo"
+[1,2]
+2
+"bar"
+[1,21]

doc/examples/at_json_pointer_const.cpp

@@ -0,0 +1,23 @@
+#include <json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON value
+    json j =
+    {
+        {"number", 1}, {"string", "foo"}, {"array", {1, 2}}
+    };
+
+    // read-only access
+
+    // output element with JSON pointer "/number"
+    std::cout << j.at("/number"_json_pointer) << '\n';
+    // output element with JSON pointer "/string"
+    std::cout << j.at("/string"_json_pointer) << '\n';
+    // output element with JSON pointer "/array"
+    std::cout << j.at("/array"_json_pointer) << '\n';
+    // output element with JSON pointer "/array/1"
+    std::cout << j.at("/array/1"_json_pointer) << '\n';
+}

doc/examples/at_json_pointer_const.link

@@ -0,0 +1 @@
+<a target="_blank" href="http://melpon.org/wandbox/permlink/O1Jx8KXGu0EqkwFg"><b>online</b></a>

doc/examples/at_json_pointer_const.output

@@ -0,0 +1,4 @@
+1
+"foo"
+[1,2]
+2