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In This Case It Does Work.

The behavior is undefined if valid () is false before the call to this. If the future is the result of a call to async that used lazy evaluation, this function returns immediately without waiting. In such situation future grants assigned on the database level are ignored.

Perhaps Installing A Previous Version Of.

This function may block for longer than timeout_duration due to. The behavior is undefined if valid() == false before the call to this function. One plausible scenario is existence of another future grants that are assigned on schema level to different role.

Std::future Is An Object Used In Multithreaded Programming To Receive Data Or An Exception From A Different Thread;

The get member function waits (by calling wait ()) until the shared state is ready, then retrieves the value stored in the shared state (if any). A future represents the result of an asynchronous operation, and can have two states: If the future is the result of a call to std::async that used lazy evaluation, this function returns immediately without waiting.

Valid() == True After The Call.

Right after calling this function, valid () is false. The class template std::future provides a mechanism to access the result of asynchronous operations: I'm wondering how this break in backwards compatibility should in general be navigated.

Blocks Until The Result Becomes Available.

Most likely, as you aren't doing this just for fun, you actually need the. In general, it probably doesn't. An asynchronous operation (created via std::async, std::packaged_task,.