namespace std {
void swap(nlohmann::basic_json& j1, nlohmann::basic_json& j2);
}
Exchanges the values of two JSON objects.
j1 (in, out) : value to be replaced by j2
j2 (in, out) : value to be replaced by j1
No-throw guarantee: this function never throws exceptions.
Constant.
void swap(nlohmann::basic_json& j1, nlohmann::basic_json& j2)
{
j1.swap(j2);
}
Example
The following code shows how two values are swapped with std::swap.
#include <iostream>
#include <iomanip>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
// create JSON values
json j1 = {{"one", 1}, {"two", 2}};
json j2 = {1, 2, 4, 8, 16};
std::cout << "j1 = " << j1 << " | j2 = " << j2 << '\n';
// swap values
std::swap(j1, j2);
std::cout << "j1 = " << j1 << " | j2 = " << j2 << std::endl;
}
Output:
j1 = {"one":1,"two":2} | j2 = [1,2,4,8,16]
j1 = [1,2,4,8,16] | j2 = {"one":1,"two":2}