mirror of
https://github.com/nlohmann/json
synced 2024-12-28 03:11:07 +00:00
9b32f72584
As I learned in https://github.com/melpon/wandbox/issues/209, this library is already installed at Wandbox, so we need to adjust the examples to use `#include "json.hpp"` insteas of `#include <json.hpp>`.
38 lines
1020 B
C++
38 lines
1020 B
C++
#include "json.hpp"
|
|
|
|
using json = nlohmann::json;
|
|
|
|
int main()
|
|
{
|
|
// create JSON values
|
|
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 back()
|
|
std::cout << j_boolean.back() << '\n';
|
|
std::cout << j_number_integer.back() << '\n';
|
|
std::cout << j_number_float.back() << '\n';
|
|
std::cout << j_object.back() << '\n';
|
|
//std::cout << j_object_empty.back() << '\n'; // undefined behavior
|
|
std::cout << j_array.back() << '\n';
|
|
//std::cout << j_array_empty.back() << '\n'; // undefined behavior
|
|
std::cout << j_string.back() << '\n';
|
|
|
|
// back() called on a null value
|
|
try
|
|
{
|
|
json j_null;
|
|
j_null.back();
|
|
}
|
|
catch (json::invalid_iterator& e)
|
|
{
|
|
std::cout << e.what() << '\n';
|
|
}
|
|
}
|