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// std::future_errc example:
#include <iostream> // std::cerr
#include <future> // std::promise, std::future_error, std::future_errc
int main ()
{
std::promise<int> prom;
try {
prom.get_future();
prom.get_future(); // throws std::future_error with future_already_retrieved
}
catch (std::future_error& e) {
if (e.code() == std::make_error_condition(std::future_errc::future_already_retrieved))
std::cerr << "[future already retrieved]\n";
else std::cerr << "[unknown exception]\n";
}
return 0;
}
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