30 lines
951 B
C++
30 lines
951 B
C++
#include <iostream>
|
|
#include <nlohmann/json.hpp>
|
|
|
|
using json = nlohmann::json;
|
|
|
|
int main()
|
|
{
|
|
// create JSON values
|
|
json j_null;
|
|
json j_boolean = true;
|
|
json j_number_integer = 17;
|
|
json j_number_float = 23.42;
|
|
json j_object = {{"one", 1}, {"two", 2}};
|
|
json j_object_empty(json::value_t::object);
|
|
json j_array = {1, 2, 4, 8, 16};
|
|
json j_array_empty(json::value_t::array);
|
|
json j_string = "Hello, world";
|
|
|
|
// call front()
|
|
//std::cout << j_null.front() << '\n'; // would throw
|
|
std::cout << j_boolean.front() << '\n';
|
|
std::cout << j_number_integer.front() << '\n';
|
|
std::cout << j_number_float.front() << '\n';
|
|
std::cout << j_object.front() << '\n';
|
|
//std::cout << j_object_empty.front() << '\n'; // undefined behavior
|
|
std::cout << j_array.front() << '\n';
|
|
//std::cout << j_array_empty.front() << '\n'; // undefined behavior
|
|
std::cout << j_string.front() << '\n';
|
|
}
|