On Sat, 1 Apr 2023 13:34:02 +0000, Peter Relson wrote: > ... One is to make a copy and pass the argument by reference to the copy. > Another is to pass the actual value (somewhere, somehow). > ??? "somehow". The mechanism of passing an "actual value" distinct from a copy is left as an exercise for the student's imagination.
> ... Or make your own copy. > A third option for languages providing a syntactic distinction between "reference" and "value" is that the caller could pass a reference and entry code in the called routine could transparently make a copy. This should provide "value" semantics, except for a few race conditions, with the advantage that the code to copy exists once in the entry rather than at each point of call. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
