minor changes

doc/examples/operatorarray__key_type.cpp

@@ -0,0 +1,30 @@
+#include <json.hpp>
+
+using namespace nlohmann;
+
+int main()
+{
+    // create a JSON object
+    json object =
+    {
+        {"one", 1}, {"two", 2}, {"three", 2.9}
+    };
+
+    // output element with key "two"
+    std::cout << object["two"] << "\n\n";
+
+    // change element with key "three"
+    object["three"] = 3;
+
+    // output changed array
+    std::cout << std::setw(4) << object << "\n\n";
+
+    // mention nonexisting key
+    object["four"];
+
+    // write to nonexisting key
+    object["five"]["really"]["nested"] = true;
+
+    // output changed object
+    std::cout << std::setw(4) << object << '\n';
+}

doc/examples/operatorarray__key_type.output

@@ -0,0 +1,19 @@
+2
+
+{
+    "one": 1,
+    "three": 3,
+    "two": 2
+}
+
+{
+    "five": {
+        "really": {
+            "nested": true
+        }
+    },
+    "four": null,
+    "one": 1,
+    "three": 3,
+    "two": 2
+}

doc/examples/operatorarray__key_type_const.cpp

@@ -0,0 +1,15 @@
+#include <json.hpp>
+
+using namespace nlohmann;
+
+int main()
+{
+    // create a JSON object
+    json object =
+    {
+        {"one", 1}, {"two", 2}, {"three", 2.9}
+    };
+
+    // output element with key "two"
+    std::cout << object["two"] << '\n';
+}

doc/examples/operatorarray__key_type_const.output

@@ -0,0 +1 @@
+2