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std::latch::count_down(3)     C++ Standard Libary    std::latch::count_down(3)

NAME
       std::latch::count_down -	std::latch::count_down

Synopsis
	  void count_down( std::ptrdiff_t n = 1	);  (since C++20)

	  Atomically decrements	the internal counter by	n without blocking the
       caller.

	  If  n	 is greater than the value of the internal counter or is nega-
       tive, the behavior
	  is undefined.

	  This operation strongly happens-before all calls that	are  unblocked
       on this latch.

Parameters
	  n - the value	by which the internal counter is decreased

Return value
	  (none)

Exceptions
	  Throws  std::system_error with an error code allowed for mutex types
       on error.

http://cppreference.com		  2022.07.31	     std::latch::count_down(3)

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