std::latch::count_down

void count_down( std::ptrdiff_t n = 1 );

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

Parameters

Return value

(none).

Exceptions

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