1 #include <iostream> 2 #include <iomanip> 3 #include <nlohmann/json.hpp> 4 5 using json = nlohmann::json; 6 using namespace nlohmann::literals; 7 main()8int main() 9 { 10 // create two JSON objects 11 json o1 = R"( {"color": "red", "price": 17.99, "names": {"de": "Flugzeug"}} )"_json; 12 json o2 = R"( {"color": "blue", "speed": 100, "names": {"en": "plane"}} )"_json; 13 json o3 = o1; 14 15 // add all keys from o2 to o1 (updating "color", replacing "names") 16 o1.update(o2.begin(), o2.end()); 17 18 // add all keys from o2 to o1 (updating "color", merging "names") 19 o3.update(o2.begin(), o2.end(), true); 20 21 // output updated object o1 and o3 22 std::cout << std::setw(2) << o1 << '\n'; 23 std::cout << std::setw(2) << o3 << '\n'; 24 } 25