[fpc-pascal] Error: Argument cannot be assigned to
lazarus at mfriebe.de
Sun Jun 4 15:28:37 CEST 2023
On 04/06/2023 15:04, Juha Manninen via fpc-pascal wrote:
> Why the following code fails to compile?
> TMyRec = record
> RecInstance: TMyRec read fRecInstance;// write fRecInstance;
> MyObj.RecInstance.ii := 123;
> Access through property seems to be the problem. Accessing
> fRecInstance directly works.
A property enforces that any code you write will work even if you change
the property to a getter/setter.
Or in other words, it will fail any code that would not work.
If this was a getter, it would be
function GetRec: TMyRec;
And that returns a *copy* in a temporary location of the record.
Technically you can modify the members of the temp record (just to have
the work thrown away afterwards).
So I guess the compiler forbids it, because the only case it would ever
be done is: by mistake.
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