std::promise::set_value

From cppreference.com
void set_value( const R& value );
(1) (member only of generic promise template)
(since C++11)
void set_value( R&& value );
(2) (member only of generic promise template)
(since C++11)
void set_value( R& value );
(3) (member only of promise<R&> template specialization)
(since C++11)
void set_value()
(4) (member only of promise<void> template specialization)
(since C++11)

Stores the value into the shared state and makes the state ready.

The operation is atomic, i.e. it behaves as though they acquire a single mutex associated with the promise object while updating the promise object.

An exception is thrown if there is no shared state or the shared state already stores a value or exception.

Contents

[edit] Parameters

value - value to store in the shared state

[edit] Return value

(none)

[edit] Exceptions

std::future_error on the following conditions:

  • *this has no shared state. The error category is set to no_state.

Additionally:

1-2) Any exception thrown by the copy constructor of value
3) Any exception thrown by the move constructor of value

[edit] Example

[edit] See also

sets the result to indicate an exception
(public member function)