# std::experimental::latch::count_down

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< cpp‎ | experimental‎ | latch

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.

### Parameters

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

### Return value

(none)

### Exceptions

Throws nothing.

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