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.
[edit] Parameters
n
-
the value by which the internal counter is decreased
[edit] Return value
(none)
[edit] Exceptions
Throws nothing.