#include <future>
#include <cstring>
#include <cassert>
int main()
{
{
std::future_error f(std::make_error_code(std::future_errc::broken_promise));
assert(std::strcmp(f.what(), "The associated promise has been destructed prior "
"to the associated state becoming ready.") == 0);
}
{
std::future_error f(std::make_error_code(std::future_errc::future_already_retrieved));
assert(std::strcmp(f.what(), "The future has already been retrieved from "
"the promise or packaged_task.") == 0);
}
{
std::future_error f(std::make_error_code(std::future_errc::promise_already_satisfied));
assert(std::strcmp(f.what(), "The state of the promise has already been set.") == 0);
}
{
std::future_error f(std::make_error_code(std::future_errc::no_state));
assert(std::strcmp(f.what(), "Operation not permitted on an object without "
"an associated state.") == 0);
}
}