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nlohmannjson/doc/examples/update__range.cpp

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#include <iostream>
#include "json.hpp"
using json = nlohmann::json;
int main()
{
// create two JSON objects
json o1 = R"( {"color": "red", "price": 17.99} )"_json;
json o2 = R"( {"color": "blue", "speed": 100} )"_json;
// add all keys from o2 to o1 (updating "color")
o1.update(o2.begin(), o2.end());
// output updated object o1
std::cout << std::setw(2) << o1 << '\n';
}