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std::counti...try_acquire(3)  C++ Standard Libary std::counti...try_acquire(3)

NAME
       std::counting_semaphore::try_acquire - std::counting_semaphore::try_ac-
       quire

Synopsis
	  bool try_acquire() noexcept;	(since C++20)

	  Tries	 to  atomically	 decrement  the	internal counter by 1 if it is
       greater than
	  0; no	blocking occurs	regardless.

Return value
	  true if it decremented the internal counter, otherwise false

Notes
	  Implementations are allowed to fail to decrement the counter even if
       it was greater
	  than 0 - i.e., they are allowed to spuriously	fail and return	false.

http://cppreference.com		  2022.07.31	  std::counti...try_acquire(3)

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