Your latter example a b c d e f 1 2 3 works for me calling swapbuffers 6, \@buffer. Your example looks as if you called swapbuffers 8, \@buffer. It also seems to be very similar to graff's proposal 1118234 that I do not quite understand still.

In reply to Re^7: [OT] Swapping buffers in place. by hdb
in thread [OT] Swapping buffers in place. by BrowserUk

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