Hi,
FPC and Delphi handle type alias differently and I wonder if this was
deliberate.
type
TMyDouble = type double;
TBird<T> = class
a: T;
end;
TDoubleBird = TBird<double>;
TMyDoubleBird = TBird<TMyDouble>;
Both FPC and Delphi create different classes for TDoubleBird and
TMyDoubleBird.
In Delphi they are not assign compatible, in FPC they are. For example:
var
a: TDoubleBird;
b: TMyDoubleBird;
begin
b:=TMyDoubleBird.Create;
a:=b; // forbidden in Delphi
writeln(a is TDoubleBird); // writes false
Bytewise the assignment is ok, but logic wise "a" is no longer a
TDoubleBird.
Is this a bug or a feature?
Mattias
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