Using custom attribute for a general parser. Is possible in D ?

[bioinfornatics via Digitalmars-d-learn]

On Monday, 26 May 2014 at 19:50:29 UTC, Ali Çehreli wrote:
> On 05/23/2014 09:09 AM, bioinfornatics wrote:
>
> > struct A {
> >           @section( ( word ) =>  word[0] == '@', ( word ) =>
> > word[0] == '\n')
> >           int a;
> > }
>
> I was able to make that work if I used function instead of 
> delegate:
>
> import std.stdio;
>
> struct attribute { }
>
> alias MatchFunc = bool function( string );
>
> @attribute
> struct section {
>      MatchFunc start;
>      MatchFunc end;
>
>      this( in MatchFunc start,
>            in MatchFunc end)
>      {
>          this.start  = start,
>          this.end    = end;
>      }
> }
>
> struct A {
>     @section((string word) => word[0] == '@',
>              (string word) => word[0] == '\n')
>     int a;
> }
>
> import std.traits;
>
> void main()
> {
>     auto aa = A();
>     auto t = __traits(getAttributes, A.a);
>
>     foreach (sect; t) {
>         auto start_result = sect.start("@test");
>         auto end_result = sect.end("\n");
>
>         writefln("Results: %s and %s", start_result, 
> end_result);
>     }
> }
>
> Ali

thanks Ali nice works as usual :-)

it seem delegate will be suppoted into dmdfe 2.066