[fpc-pascal] Initializing records and other complicated structures
befelemepeseveze at gmail.com
Mon Sep 27 10:38:16 CEST 2010
2010/9/27 Jim <hakkie42 at gmail.com>:
> Fpc sometimes complains (hints) about local variables not being initialized.
> My question: how do I initialize more complicated structures like
> records? And should I need to (I'm guessing no in the example below, but
> the contents of the record will be undefined - no problem as there are
> no pointers/strings in there)?
> TIfdTag = packed Record
> ID: word;
> //Tag number
> Typ: word;
> //Type tag
> Count: cardinal;
> //tag length
> Offset: cardinal;
> //Offset / Value
> tag: TIfdTag;
> in code somewhere
> As TIfdTag seems to contain non-pointer records only, I thought I could
> use Sizeof and tried this:
> FillByte(tag, SizeOf(tag), 0); //initialize var.
> The compiler warning doesn't go away though.
> Is this the recommended way of doing things?
There is not enough code shown to say much. If the ReadTag procedure
is declared with a presumably var paramater of type TIfdTag then the
compiler warning is OK if the passed record has not been initialized
in any way. In such case it may/should help to change the 'var'
paramater to an 'out' parameter to explicitly tell the compiler that
there is nothing going into ReadTag but only the other way.
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