NAME¶

std::latch::count_down - std::latch::count_down

Synopsis¶

void count_down( std::ptrdiff_t n = 1 ); (since C++20)

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¶

n - the value by which the internal counter is decreased

Return value¶

(none)

Exceptions¶

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