What are AST Macros?

[Rory McGuire]

On Sun, 11 Jul 2010 21:55:30 +0200, Philippe Sigaud  
<philippe.sigaud at gmail.com> wrote:

> On Sun, Jul 11, 2010 at 18:58, Rory McGuire <rmcguire at neonova.co.za>  
> wrote:
>> On Sun, 11 Jul 2010 15:29:36 +0200, Michel Fortin  
>> <michel.fortin at michelf.com> wrote:
>>>
>>>        int num = 1;
>>>        string result = substitute!"Number: $num";
>>>        assert(result == "Number: 1");
>>>
>>
>> someone already made something like that, I forget where it was. Its  
>> old now.
>
> Doesn't Format (in std.metastrings) cover part of this?
>
> string result = Format!("Numbers: %s", to!string(num));
>
> I remember finding it cumbersome to use. For one, it could easily take  
> any type for argument, and call to!string on them internally. Why  
> >bothering me with this?
> But maybe I wasn't using it the right way.
>
> Hmm, I think what I'd like is some numbered substituting scheme:
>
> string result = Substitute!("static if (is (typeof(%1) t == %2!U, U)) {
>                                                         alias U Result;
>                                                     else
>                                                        alias typeof(%1)  
> Result;",                                                  a,b);
>
>
> I agree with Rory than someone already did something similar. But I  
> guess now it can be done with CTFE on strings. A CT replace.
>
>
> Philippe
>


I think I found what I was thinking of (not sure its the same one):
http://www.digitalmars.com/d/archives/digitalmars/D/PHP-style_embedded_variables_print_statements_54053.html

-Rory
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