1 #include <iostream> 2 #include <nlohmann/json.hpp> 3 4 using json = nlohmann::json; 5 main()6 int main() 7 { 8 // create several JSON values 9 json array = {1, 2, 3}; 10 json object = {{"A", "a"}, {"B", "b"}}; 11 json number = 17; 12 json string = "foo"; 13 json null; 14 15 // output values and comparisons 16 std::cout << std::boolalpha; 17 std::cout << array << " == nullptr " << (array == nullptr) << '\n'; 18 std::cout << object << " == nullptr " << (object == nullptr) << '\n'; 19 std::cout << number << " == nullptr " << (number == nullptr) << '\n'; 20 std::cout << string << " == nullptr " << (string == nullptr) << '\n'; 21 std::cout << null << " == nullptr " << (null == nullptr) << '\n'; 22 } 23