31 lines
871 B
C++
31 lines
871 B
C++
|
#include <iostream>
|
||
|
|
#include <nlohmann/json.hpp>
|
||
|
|
|
||
|
|
using json = nlohmann::json;
|
||
|
|
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
// create a JSON object with different entry types
|
||
|
|
json j =
|
||
|
|
{
|
||
|
|
{"integer", 1},
|
||
|
|
{"floating", 42.23},
|
||
|
|
{"string", "hello world"},
|
||
|
|
{"boolean", true},
|
||
|
|
{"object", {{"key1", 1}, {"key2", 2}}},
|
||
|
|
{"array", {1, 2, 3}}
|
||
|
|
};
|
||
|
|
|
||
|
|
// access existing values
|
||
|
|
int v_integer = j.value("/integer"_json_pointer, 0);
|
||
|
|
double v_floating = j.value("/floating"_json_pointer, 47.11);
|
||
|
|
|
||
|
|
// access nonexisting values and rely on default value
|
||
|
|
std::string v_string = j.value("/nonexisting"_json_pointer, "oops");
|
||
|
|
bool v_boolean = j.value("/nonexisting"_json_pointer, false);
|
||
|
|
|
||
|
|
// output values
|
||
|
|
std::cout << std::boolalpha << v_integer << " " << v_floating
|
||
|
|
<< " " << v_string << " " << v_boolean << "\n";
|
||
|
|
}
|