[Issue 4265] It should be possible to query template parameters with __traits

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4265


Andrej Mitrovic <andrej.mitrovich at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |k.hara.pg at gmail.com


--- Comment #8 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2013-04-06 06:40:55 PDT ---
(In reply to comment #5)
> I can have a pull ready soon for 2 traits:

I managed to lose the branch where I implemented this. I think I only did it
partially though.

@kenji: If you have this:

template T(Args...) { }
struct S(Args...) { }
alias Tint = T!int;
alias Sint = S!int;

How do you get to the 'S' declaration from the instance? I want to implement
these traits:

static assert(is(__traits(getTemplateSymbol, SInt) == S));
static assert(is(__traits(getTemplateArgs, SInt) == int));

I've tried this in traits.c:

Dsymbol *s = getDsymbol(o);
TemplateInstace *ti = s->isTemplateInstance();

However that only works for Tint, and not for Sint. 's' is actually a
StructDeclaration for Sint, not a TemplateInstance.

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