Giuliano Colla via fpc-pascal <fpc-pascal@lists.freepascal.org> schrieb am Mi., 12. Apr. 2023, 22:54:
> Il 12/04/2023 21:17, Bo Berglund via fpc-pascal ha scritto: > > And if so, what is the rule for **when** to use var in function call argument > lists for items that will be changed inside the called function and used > afterwards? > > Your Wargs is defined as an open array, i.e. its length is unknown at > compile time. Therefore the compiler cannot pass it in the subroutine call > other than a pointer to the array. It cannot pass the array content because > it doesn't know its length. > In that case you may omit the var specifier. > But if one day you change your mind, and decide to establish a size for > your array, without var the compiler may decide to pass the full array data > to the procedure, and therefore whatever you do in your procedure is done > on the local copy of the array and not in the original array. > My suggestion is to specify "var" whenever your procedure is expected to > modify the data passed. It makes the program more readable, even if "var" > is redundant. > There is *no* open array in the example given. Also even if there were changing the length of an open array would not work... Regards, Sven
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