1#include <iostream> 2#include <nlohmann/json.hpp> 3 4using json = nlohmann::json; 5 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_float = 23.42; 13 json j_object = {{"one", 1}, {"two", 2}}; 14 json j_object_empty(json::value_t::object); 15 json j_array = {1, 2, 4, 8, 16}; 16 json j_array_empty(json::value_t::array); 17 json j_string = "Hello, world"; 18 19 // call front() 20 //std::cout << j_null.front() << '\n'; // would throw 21 std::cout << j_boolean.front() << '\n'; 22 std::cout << j_number_integer.front() << '\n'; 23 std::cout << j_number_float.front() << '\n'; 24 std::cout << j_object.front() << '\n'; 25 //std::cout << j_object_empty.front() << '\n'; // undefined behavior 26 std::cout << j_array.front() << '\n'; 27 //std::cout << j_array_empty.front() << '\n'; // undefined behavior 28 std::cout << j_string.front() << '\n'; 29} 30