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Move bytes from the output sequence to the input sequence.
void commit(
std::size_t n);
The number of bytes to append from the start of the output sequence to the end of the input sequence. The remainder of the output sequence is discarded.
Requires a preceding call prepare(x) where x >= n,
and no intervening operations that modify the input or output sequence.
If n is greater than the size of the output sequence, the
entire output sequence is moved to the input sequence and no error is issued.