[fpc-devel] which constant expression?
Mario R. Carro
mcarro at gmx.net
Sat May 26 23:40:12 CEST 2007
Hi. Why does this fail to compile with FPC 2.3.1? (from ZeosLib):
procedure TZExpression.SetTokenizer(Value: IZTokenizer);
FTokenizer := Value;
TZExpressionParser(FParser).Tokenizer := Value; // <-- This line fails
FParser is declared as TObject and assigned a TZExpressionParser at runtime.
Tokenizer is a property of TZExpressionParser of type IZTokenizer that gives
direct access to the field FTokenizer of the same class.
The error message says:
ZExpression.pas(479,20) Error: Can't take the address of constant expressions
I googled a little and found that this error message is associated to trying
to use a property as a var parameter or to try to modify a member of a value
returned by a property, but this isn't any of those cases. May the problem be
the property is of an interface type?
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