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nlohmannjson/doc/examples/swap__object_t.cpp

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create a JSON value
json value = { {"translation", {{"one", "eins"}, {"two", "zwei"}}} };
// create an object_t
json::object_t object = {{"cow", "Kuh"}, {"dog", "Hund"}};
// swap the object stored in the JSON value
value["translation"].swap(object);
// output the values
std::cout << "value = " << value << '\n';
std::cout << "object = " << object << '\n';
}