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Move characters from the output sequence to the input sequence.
void commit(
    std::size_t n);
          Appends n characters from the start of the output sequence
          to the input sequence. The beginning of the output sequence is advanced
          by n characters.
        
          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.