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nlohmannjson/doc/examples/basic_json__copyassignment.cpp

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#include <iostream>
#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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int main()
{
// create JSON values
json a = 23;
json b = 42;
// copy-assign a to b
b = a;
// serialize the JSON arrays
std::cout << a << '\n';
std::cout << b << '\n';
}