1 #include <iostream> 2 #include <nlohmann/json.hpp> 3 4 using json = nlohmann::json; 5 main()6int main() 7 { 8 // create JSON values 9 json j_null; 10 json j_boolean = true; 11 json j_number_integer = -17; 12 json j_number_unsigned = 42u; 13 json j_number_float = 23.42; 14 json j_object = {{"one", 1}, {"two", 2}}; 15 json j_array = {1, 2, 4, 8, 16}; 16 json j_string = "Hello, world"; 17 18 // call operator value_t() 19 json::value_t t_null = j_null; 20 json::value_t t_boolean = j_boolean; 21 json::value_t t_number_integer = j_number_integer; 22 json::value_t t_number_unsigned = j_number_unsigned; 23 json::value_t t_number_float = j_number_float; 24 json::value_t t_object = j_object; 25 json::value_t t_array = j_array; 26 json::value_t t_string = j_string; 27 28 // print types 29 std::cout << std::boolalpha; 30 std::cout << (t_null == json::value_t::null) << '\n'; 31 std::cout << (t_boolean == json::value_t::boolean) << '\n'; 32 std::cout << (t_number_integer == json::value_t::number_integer) << '\n'; 33 std::cout << (t_number_unsigned == json::value_t::number_unsigned) << '\n'; 34 std::cout << (t_number_float == json::value_t::number_float) << '\n'; 35 std::cout << (t_object == json::value_t::object) << '\n'; 36 std::cout << (t_array == json::value_t::array) << '\n'; 37 std::cout << (t_string == json::value_t::string) << '\n'; 38 } 39