Property expressions: Cannot assign "Integer" to "TEnum"

[Former user]

Is this a bug in DWScript?

Script:

unit Test;

type TIntegerField = class
    property Name: String;
    property Value: Integer;
end;

type TEnum = enum (Blub1, Blub2, Blub3);

type TFoo = class
    property EnumField: TIntegerField;
    property EnumFieldValue: TEnum read (EnumField.Value) write (EnumField.Value);

    constructor Create;
    begin
        EnumField := new TIntegerField;
    end;
end;

var Foo := new TFoo;
Foo.EnumField.Name := 'EnumName';
Foo.EnumField.Value := TEnum.Blub2;

PrintLn(Foo.EnumField.Name);
PrintLn(Foo.EnumField.Value);
PrintLn(Foo.EnumFieldValue);

Error:

Syntax Error: Incompatible types: Cannot assign "Integer" to "TEnum" [line: 12, column: 49]

[Christian Budde]

I don't think it's a bug in DWScript, because EnumField is of type TIntegerField and its property Value is an Integer. This integer type is different to the EnumFieldValue property type (TEnum).

I haven't tried this, but eventually you can cast it to TEnum like:

    property EnumFieldValue: TEnum read (TEnum(EnumField.Value)) write (TEnum(EnumField.Value));

I'm not sure if this makes sense (in terms of legibility of the code), but eventually it compiles.

[Eric Grange]

Yes, Christian is right, this is by design (and same as in Delphi).

To convert between an integer and an enum, an explicit cast is required.