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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.