What are AST Macros?

[Philippe Sigaud]

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
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