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# std::experimental::latch::count_down

From cppreference.com
< 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`.

### [edit] Parameters

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

### [edit] Return value

(none)

### [edit] Exceptions

Throws nothing.

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