Multiple opCasts

[Simen Kjaeraas]

On Mon, 25 Aug 2008 17:54:05 +0200, Denis Koroskin <2korden at gmail.com>  
wrote:

> On Mon, 25 Aug 2008 01:44:05 +0400, Russell Lewis  
> <webmaster at villagersonline.com> wrote:
>
>> Jarrett Billingsley wrote:
>>> "dsimcha" <dsimcha at yahoo.com> wrote in message  
>>> news:g8po0h$2hen$1 at digitalmars.com...
>>
>> (snip)
>>
>>>> On the calling side:
>>>>
>>>> Foo foo;
>>>> int i = cast(int) foo;  //equivalent to int i = foo.opCast!(int)().
>>>> float f = cast(float) foo;  //equivalent to float f =  
>>>> foo.opCast!(float)()
>>>  No offense meant, but this has been proposed multiple times.
>>
>> I was going to reply and say that this was an exciting and elegant  
>> idea, since I hadn't remembered seeing it before.  I guess I will offer  
>> congrats to dsimcha, and also to everybody had who suggested it before.
>>
>> :)
>>
>> Russ
>
> I am not that excited with exact this solution since templated functions
> cannot be virtual. That's why I give my vote to the following one:
>
> class Foo
> {
>      void opCast(ref float value) {
>          value = 42.0f;
>      }
>
>      void opImplicitCast(ref int value) {
>          value = 42;
>      }
> }
>
> Foo foo = new Foo();
> int bar = value;               // int bar; value.opImplicitCast(bar);
> float baz = cast(float)value;  // float baz; value.opCast(baz);

Also proposed before (by me, probably others as well).

-- 
Simen