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nlohmannjson/doc/examples/crbegin.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 an array value
json array = {1, 2, 3, 4, 5};
// get an iterator to the reverse-beginning
json::const_reverse_iterator it = array.crbegin();
// serialize the element that the iterator points to
std::cout << *it << '\n';
}