1 #include <iostream>
2 #include <nlohmann/json.hpp>
3
4 using json = nlohmann::json;
5 using namespace nlohmann::literals;
6
main()7 int main()
8 {
9 // create a JSON object with different entry types
10 json j =
11 {
12 {"integer", 1},
13 {"floating", 42.23},
14 {"string", "hello world"},
15 {"boolean", true},
16 {"object", {{"key1", 1}, {"key2", 2}}},
17 {"array", {1, 2, 3}}
18 };
19
20 // access existing values
21 int v_integer = j.value("/integer"_json_pointer, 0);
22 double v_floating = j.value("/floating"_json_pointer, 47.11);
23
24 // access nonexisting values and rely on default value
25 std::string v_string = j.value("/nonexisting"_json_pointer, "oops");
26 bool v_boolean = j.value("/nonexisting"_json_pointer, false);
27
28 // output values
29 std::cout << std::boolalpha << v_integer << " " << v_floating
30 << " " << v_string << " " << v_boolean << "\n";
31 }
32