Hello,

Is there a way to specifie a constant argument ( I would say an argument for which his value is evaluate at compile time )

For example, something like this :

/* -------- CODE --------- */
import tango.io.Stdout;

void func(const bool constArg)
{
    static if (constArg)
        Stdout("Yes").newline;
    else
        Stdout("No").newline;
}

void main()
{
    func( true );
    func( false );
}
/* -------- END CODE --------- */

Thanks in advance,
TSalm

On Sat, Mar 28, 2009 at 6:12 AM, TSalm <TSalm@free.fr> wrote:
> Hello,
>
> Is there a way to specifie a constant argument ( I would say an argument for which his value is evaluate at compile time )
>
> For example, something like this :
>
> /* -------- CODE --------- */
> import tango.io.Stdout;
>
> void func(const bool constArg)
> {
>    static if (constArg)
>        Stdout("Yes").newline;
>    else
>        Stdout("No").newline;
> }
>
> void main()
> {
>    func( true );
>    func( false );
> }
> /* -------- END CODE --------- */

You have to do it with templates:

void func(bool constArg)()
{
    static if(constArg) ... else ...
}

func!(true)();
func!(false)();

Walter suggested, in the D2 presentation at the conference in 2007, that there should be "static" parameters which would work the way your code should work.

Le Sat, 28 Mar 2009 12:21:52 +0100, Jarrett Billingsley <jarrett.billingsley@gmail.com> a écrit:

> On Sat, Mar 28, 2009 at 6:12 AM, TSalm <TSalm@free.fr> wrote:
>> Hello,
>>
>> Is there a way to specifie a constant argument ( I would say an argument for
>> which his value is evaluate at compile time )
>>
>> For example, something like this :
>>
>> /* -------- CODE --------- */
>> import tango.io.Stdout;
>>
>> void func(const bool constArg)
>> {
>>    static if (constArg)
>>        Stdout("Yes").newline;
>>    else
>>        Stdout("No").newline;
>> }
>>
>> void main()
>> {
>>    func( true );
>>    func( false );
>> }
>> /* -------- END CODE --------- */
>
> You have to do it with templates:
>
> void func(bool constArg)()
> {
>     static if(constArg) ... else ...
> }
>
> func!(true)();
> func!(false)();
>
Thanks.

> Walter suggested, in the D2 presentation at the conference in 2007,
> that there should be "static" parameters which would work the way your
> code should work.
good idea IMO.

Le Sat, 28 Mar 2009 17:52:54 +0100, TSalm <TSalm@free.fr> a écrit:

> Le Sat, 28 Mar 2009 12:21:52 +0100, Jarrett Billingsley <jarrett.billingsley@gmail.com> a écrit:
>
>> On Sat, Mar 28, 2009 at 6:12 AM, TSalm <TSalm@free.fr> wrote:
>>> Hello,
>>>
>>> Is there a way to specifie a constant argument ( I would say an argument for
>>> which his value is evaluate at compile time )
>>>
>>> For example, something like this :
>>>
>>> /* -------- CODE --------- */
>>> import tango.io.Stdout;
>>>
>>> void func(const bool constArg)
>>> {
>>>    static if (constArg)
>>>        Stdout("Yes").newline;
>>>    else
>>>        Stdout("No").newline;
>>> }
>>>
>>> void main()
>>> {
>>>    func( true );
>>>    func( false );
>>> }
>>> /* -------- END CODE --------- */
>>
>> You have to do it with templates:
>>
>> void func(bool constArg)()
>> {
>>     static if(constArg) ... else ...
>> }
>>
>> func!(true)();
>> func!(false)();
>>
> Thanks.
>
>> Walter suggested, in the D2 presentation at the conference in 2007,
>> that there should be "static" parameters which would work the way your
>> code should work.
> good idea IMO.

I've just think that, since templated methods don't treat with respect rules of object inheritance, this could be a cause of mistakes...