json/doc/examples/insert.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 v = {1, 2, 3, 4};
// insert number 10 before number 3
auto new_pos = v.insert(v.begin() + 2, 10);
// output new array and result of insert call
std::cout << *new_pos << '\n';
std::cout << v << '\n';
}