std::future<>::wait_for Member function

Wait until the asynchronous result associated with an instance of std::future is ready, or until a specified time period has elapsed.

template<typename Rep,typename Period>
future_status wait_for(
    std::chrono::duration<Rep,Period> const&
    relative_time);

Preconditions:: this->valid() would return true.
Effects:: If the asynchronous result associated with *this contains a deferred function arising from a call to std::async that has not yet started execution, returns immediately without blocking. Otherwise blocks until the asynchronous result associated with *this is ready or the time period specified by relative_time has elapsed.
Returns:: std::future_status::deferred if the asynchronous result associated with *this contains a deferred function arising from a call to std::async that has not yet started execution, std::future_status::ready if the asynchronous result associated with *this is ready, std::future_status::timeout if the time period specified by relative_time has elapsed.
Note:: The thread may be blocked for longer than the specified duration. Where possible, the elapsed time is determined by a steady clock.
Throws:: Nothing.

#include <future>

just::thread Complete C++ Standard Thread Library by Just Software Solutions