C Future

For default constructed future objects this function returns false unless move assigned a valid future. The class templates future and shared future describe asynchronous return objects.

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No state an operation attempted to access.

C future. The value is set directly by using a std promise or set to the result of a function call using std packaged task or std async. A future is an object that can retrieve a value from some provider object or function properly synchronizing this access if in different threads. Each of the class templates promise future and shared future has a specialization for the type void and a partial specialization for storing and retrieving a value by reference.

In the dojo toolkit s deferred api as of version 1 5 a consumer only promise object represents a read only view. The class template std shared future provides a mechanism to access the result of asynchronous operations similar to std future except that multiple threads are allowed to wait for the same shared state unlike std future which is only moveable so only one instance can refer to any particular asynchronous result std shared future is copyable and multiple shared future objects may. Future objects are only useful when they are valid.

Broken promise the promise object with which the future shares its shared state was destroyed before being set a value or an exception. Valid futures are future objects associated to a shared state and are constructed by calling one of the following functions. The value retrieved by its member future get is the value returned by fn if any.

Future errc label int value description. Future already retrieved a future object was already retrieved from this provider. These specializations differ from the primary template only in the signatures and.

Once the value of the shared state is retrieved. A future object whose shared state is made ready when the execution of fn ends. Futures can only be initially constructed with valid shared states by certain provider functions such as async promise get future or packaged task get future.

In c 11 a std future provides a read only view. In this case its destructor synchronizes. When launch async is selected the future returned is linked to the end of the thread created even if its shared state is never accessed.

Returns whether the future object is currently associated with a shared state. Promise already satisfied the promise object was already set a value or exception.

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