[fpc-pascal] TMemoryStream.SetSize question.

Michael Van Canneyt michael at freepascal.org
Mon Jun 14 21:27:57 CEST 2021

On Mon, 14 Jun 2021, gabor via fpc-pascal wrote:

> Why does TMemoryStream only implement one version of SetSize method?
> https://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/rtl/objpas/classes/classesh.inc?revision=49038&view=markup#l1225
> The TStream class has two versions of SetSize method (virtual, overload) 
> - one with a parameter of LongInt type and the other with the Int64 
> type. Since function is virtual, child classes can override it and can 
> be called from code, but then a version of the SetSize function not 
> implemented for a given platform in the TMemoryStream class can be called.

The base method checks which one is overridden. 
So it does not matter which one you override in the child.
The "other" one will always fall back to the method in TStream.


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