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// future_error::what example:
#include <iostream> // std::cout
#include <future> // std::promise, std::future_error
int main ()
{
std::promise<int> prom;
try {
prom.get_future();
prom.get_future(); // throws std::future_error
}
catch (std::future_error& e) {
std::cout << "future_error caught: " << e.what() << '\n';
}
return 0;
}
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