32 Thread support library [thread]

32.9 Futures [futures]

32.9.1 Overview [futures.overview]

[futures] describes components that a C++ program can use to retrieve in one thread the result (value or exception) from a function that has run in the same thread or another thread.
[Note 1:
These components are not restricted to multi-threaded programs but can be useful in single-threaded programs as well.
— end note]