in reply to [OT] Swapping buffers in place.

For buffers of any significant size this looks like far too much work! Can't you fix your code that uses these buffers to access them through pointers and then you just swap the pointers?

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Re^2: [OT] Swapping buffers in place.
by BrowserUk (Patriarch) on Mar 01, 2015 at 10:53 UTC

    No. This is to deal with the edge case where the last buffer is partial. Think:end-of-file. "swapping pointers" would not achieve the same result.

    After the swap, the left (full-sized) buffer will contain the contents of the right buffer, made up the full buffer size, with the left-hand end of the left buffer.

    And the right buffer contains the right-hand end the left buffer.

    The buffers are mem-mapped chunks of a disk file. You can't swap chunks of disk around by swapping pointers.

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