json/docs/examples/insert__range_object.cpp

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#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
// create two JSON objects
json j1 = {{"one", "eins"}, {"two", "zwei"}};
json j2 = {{"eleven", "elf"}, {"seventeen", "siebzehn"}};
// output objects
std::cout << j1 << '\n';
std::cout << j2 << '\n';
// insert range from j2 to j1
j1.insert(j2.begin(), j2.end());
// output result of insert call
std::cout << j1 << '\n';
}