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doc/examples/is_discarded.cpp

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+#include <json.hpp>
+
+using namespace nlohmann;
+
+int main()
+{
+    // create JSON values
+    json j_null;
+    json j_boolean = true;
+    json j_number_integer = 17;
+    json j_number_float = 23.42;
+    json j_object = {{"one", 1}, {"two", 2}};
+    json j_array = {1, 2, 4, 8, 16};
+    json j_string = "Hello, world";
+
+    // call is_discarded()
+    std::cout << std::boolalpha;
+    std::cout << j_null.is_discarded() << '\n';
+    std::cout << j_boolean.is_discarded() << '\n';
+    std::cout << j_number_integer.is_discarded() << '\n';
+    std::cout << j_number_float.is_discarded() << '\n';
+    std::cout << j_object.is_discarded() << '\n';
+    std::cout << j_array.is_discarded() << '\n';
+    std::cout << j_string.is_discarded() << '\n';
+}

doc/examples/is_discarded.link

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+<a target="_blank" href="http://melpon.org/wandbox/permlink/Fz9sE7wOVCDCxuqw"><b>online</b></a>

doc/examples/is_discarded.output

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+false
+false
+false
+false
+false
+false
+false

doc/examples/operator__equal__nullptr_t.cpp

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+#include <json.hpp>
+
+using namespace nlohmann;
+
+int main()
+{
+    // create several JSON values
+    json array = {1, 2, 3};
+    json object = {{"A", "a"}, {"B", "b"}};
+    json number = 17;
+    json string = "foo";
+    json null;
+
+    // output values and comparisons
+    std::cout << std::boolalpha;
+    std::cout << array << " == nullptr " << (array == nullptr) << '\n';
+    std::cout << object << " == nullptr " << (object == nullptr) << '\n';
+    std::cout << number << " == nullptr " << (number == nullptr) << '\n';
+    std::cout << string << " == nullptr " << (string == nullptr) << '\n';
+    std::cout << null << " == nullptr " << (null == nullptr) << '\n';
+}

doc/examples/operator__equal__nullptr_t.link

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+<a target="_blank" href="http://melpon.org/wandbox/permlink/gXAi4IhfawcmtX6v"><b>online</b></a>

doc/examples/operator__equal__nullptr_t.output

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+[1,2,3] == nullptr false
+{"A":"a","B":"b"} == nullptr false
+17 == nullptr false
+"foo" == nullptr false
+null == nullptr true

doc/examples/operator__notequal__nullptr_t.cpp

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+#include <json.hpp>
+
+using namespace nlohmann;
+
+int main()
+{
+    // create several JSON values
+    json array = {1, 2, 3};
+    json object = {{"A", "a"}, {"B", "b"}};
+    json number = 17;
+    json string = "foo";
+    json null;
+
+    // output values and comparisons
+    std::cout << std::boolalpha;
+    std::cout << array << " != nullptr " << (array != nullptr) << '\n';
+    std::cout << object << " != nullptr " << (object != nullptr) << '\n';
+    std::cout << number << " != nullptr " << (number != nullptr) << '\n';
+    std::cout << string << " != nullptr " << (string != nullptr) << '\n';
+    std::cout << null << " != nullptr " << (null != nullptr) << '\n';
+}

doc/examples/operator__notequal__nullptr_t.link

@@ -0,0 +1 @@
+<a target="_blank" href="http://melpon.org/wandbox/permlink/yfp2fEHkXCZSenTX"><b>online</b></a>

doc/examples/operator__notequal__nullptr_t.output

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+[1,2,3] != nullptr true
+{"A":"a","B":"b"} != nullptr true
+17 != nullptr true
+"foo" != nullptr true
+null != nullptr false