#include <iostream> #include <nlohmann/json.hpp> using json = nlohmann::json; 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_number_unsigned_integer = 12345678987654321u; json j_object = {{"one", 1}, {"two", 2}}; json j_array = {1, 2, 4, 8, 16}; json j_string = "Hello, world"; // call is_object() std::cout << std::boolalpha; std::cout << j_null.is_object() << '\n'; std::cout << j_boolean.is_object() << '\n'; std::cout << j_number_integer.is_object() << '\n'; std::cout << j_number_unsigned_integer.is_object() << '\n'; std::cout << j_number_float.is_object() << '\n'; std::cout << j_object.is_object() << '\n'; std::cout << j_array.is_object() << '\n'; std::cout << j_string.is_object() << '\n'; }