nstream-origin

Arguments: stream position

This function is like stream-origin, except that it destructively modifies and returns the position argument (which must be a position object created by make-position), rather than consing a new position. This may be useful to avoid garbage creation if called frequently. stream should be a cg-stream.

Unlike stream-origin, nstream-origin is not setfable. See stream-origin for further information.

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Created 2015.5.21.