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nlohmannjson/doc/examples/basic_json__basic_json.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 a JSON array
json j1 = {"one", "two", 3, 4.5, false};
// create a copy
json j2(j1);
// serialize the JSON array
std::cout << j1 << " = " << j2 << '\n';
std::cout << std::boolalpha << (j1 == j2) << '\n';
}