std::experimental::latch::count_down

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void count_down( ptrdiff_t n = 1 );	(1)	(concurrency TS)

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

If n is greater than the value of the internal counter or is negative, the behavior is undefined.

This operation synchronizes with all calls that block on this latch and all is_ready calls on this latch that returns true.

n

-

the value by which the internal counter is decreased

(none)

Throws nothing.

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