1#include <iostream> 2#include <nlohmann/json.hpp> 3 4using json = nlohmann::json; 5 6int main() 7{ 8 // create JSON values 9 json object = {{"one", 1}, {"two", 2}}; 10 json null; 11 12 // print values 13 std::cout << object << '\n'; 14 std::cout << null << '\n'; 15 16 // add values 17 auto res1 = object.emplace("three", 3); 18 null.emplace("A", "a"); 19 null.emplace("B", "b"); 20 21 // the following call will not add an object, because there is already 22 // a value stored at key "B" 23 auto res2 = null.emplace("B", "c"); 24 25 // print values 26 std::cout << object << '\n'; 27 std::cout << *res1.first << " " << std::boolalpha << res1.second << '\n'; 28 29 std::cout << null << '\n'; 30 std::cout << *res2.first << " " << std::boolalpha << res2.second << '\n'; 31} 32