• JS (11/11) Jul 19 2013 I have a template
• John Colvin (4/15) Jul 19 2013 that error is probably related to what you're passing as t, which
• JS (8/27) Jul 19 2013 Yeah, I forgot to add a private local variable and it was
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (25/42) Jul 19 2013 I read everything you wrote and came up with this:

"JS" <js.mdnq gmail.com> writes:

I have a template

template T(alias t)
{
   pragma(msg, t.stringof);
   .... other stuff ...
}

which I use in a class and pass fields/members to.

D complains that t does not have a this.

I'd just like to print the literal text that was passed to T. 
(which I actually do in ctfe) This is so I can have some sort of 
debug output of what was passed to t.

"John Colvin" <john.loughran.colvin gmail.com> writes:

On Friday, 19 July 2013 at 08:02:45 UTC, JS wrote:
 I have a template

 template T(alias t)
 {
   pragma(msg, t.stringof);
   .... other stuff ...
 }

 which I use in a class and pass fields/members to.

 D complains that t does not have a this.

 I'd just like to print the literal text that was passed to T. 
 (which I actually do in ctfe) This is so I can have some sort 
 of debug output of what was passed to t.

that error is probably related to what you're passing as t, which 
leads to the obvious question: what sort of things are you 
passing as t?

"JS" <js.mdnq gmail.com> writes:

On Friday, 19 July 2013 at 08:08:27 UTC, John Colvin wrote:
 On Friday, 19 July 2013 at 08:02:45 UTC, JS wrote:
 I have a template

 template T(alias t)
 {
  pragma(msg, t.stringof);
  .... other stuff ...
 }

 which I use in a class and pass fields/members to.

 D complains that t does not have a this.

 I'd just like to print the literal text that was passed to T. 
 (which I actually do in ctfe) This is so I can have some sort 
 of debug output of what was passed to t.

 that error is probably related to what you're passing as t, 
 which leads to the obvious question: what sort of things are 
 you passing as t?

Yeah, I forgot to add a private local variable and it was 
complaining... I didn't realize this because it was working 
before I started refactoring stuff.

I guess it would be nice to assert a proper error if t doesn't 
exist rather than the error it gave. (I'm suppose to be passing 
it a field of a class so it should exist)

Is there any way to test for "existance" of an alias?

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 07/19/2013 02:02 AM, JS wrote:

 On Friday, 19 July 2013 at 08:08:27 UTC, John Colvin wrote:
 On Friday, 19 July 2013 at 08:02:45 UTC, JS wrote:
 I have a template

 template T(alias t)
 {
  pragma(msg, t.stringof);
  .... other stuff ...
 }

 which I use in a class and pass fields/members to.



I read everything you wrote and came up with this:

template T(alias t)
{
     pragma(msg, t.stringof);
}

class C
{
     int i;

     void foo()
     {
         mixin T!i;
         mixin T!j;
     }
}

void main()
{
     auto c = new C();
}

 D complains that t does not have a this.



Hm... It does not do that for me.

 I guess it would be nice to assert a proper error if t doesn't exist
 rather than the error it gave.

That is exactly what dmd does:

Error: undefined identifier j, did you mean variable i?

 (I'm suppose to be passing it a field of
 a class so it should exist)

 Is there any way to test for "existance" of an alias?

Probably. But I suspect your code is something different from what I 
understood.

Ali