nlohmannjson/doc/examples/basic_json__moveconstructor.cpp

#include <iostream>
#include <nlohmann/json.hpp>

using json = nlohmann::json;

int main()
{
    // create a JSON value
    json a = 23;

    // move contents of a to b
    json b(std::move(a));

    // serialize the JSON arrays
    std::cout << a << '\n';
    std::cout << b << '\n';
}