basic_streambuf::commit

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.

Exceptions

std::length_error: If n is greater than the size of the output sequence.