Hairy Pixels via fpc-pascal <fpc-pascal@lists.freepascal.org> schrieb am Di., 4. Juni 2024, 10:54:
> In the manual it at https://www.freepascal.org/docs-html/ref/refse38.html > it says "Calling the constructor will provoke a call to the virtual class > method NewInstance, which, in its default implementation, calls GetMem, to > allocate enough space to hold the class instance data, and then zeroes out > the memory." > > I'm trying this like below but it crashes. Is this correct? The fact > NewInstance returns TObject instead of Pointer doesn't make sense to me and > suggests this isn't correct. > > class function TDataObject.NewInstance: TObject; > begin > result := TObject(GetMem(InstanceSize)); > end; > You also need to call TObject.InitInstance() on the allocated memory (that should probably be mentioned in the documentation...). Regards, Sven >
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