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 type() 19 std::cout << std::boolalpha; 20 std::cout << (j_null.type() == json::value_t::null) << '\n'; 21 std::cout << (j_boolean.type() == json::value_t::boolean) << '\n'; 22 std::cout << (j_number_integer.type() == json::value_t::number_integer) << '\n'; 23 std::cout << (j_number_unsigned.type() == json::value_t::number_unsigned) << '\n'; 24 std::cout << (j_number_float.type() == json::value_t::number_float) << '\n'; 25 std::cout << (j_object.type() == json::value_t::object) << '\n'; 26 std::cout << (j_array.type() == json::value_t::array) << '\n'; 27 std::cout << (j_string.type() == json::value_t::string) << '\n'; 28 } 29