30 Thread support library [thread]

30.3 Threads [thread.threads]

30.3.2 Class thread [thread.thread.class]

30.3.2.6 thread static members [thread.thread.static]

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unsigned hardware_concurrency() noexcept;
1
#
Returns: The number of hardware thread contexts.
[ Note
:
This value should only be considered to be a hint.
— end note
 ]
If this value is not computable or well-defined, an implementation should return 0.