[phobos] isClass!T

[David Simcha]

Vote++.  It's also more readable.

On Thu, May 19, 2011 at 11:11 AM, Lars Tandle Kyllingstad <
lars at kyllingen.net> wrote:

> Several places in Phobos I've noticed tests like if(is(T==class)) that
> check whether T is a class type.  I suspect it is usually meant for
> these tests to pass if T is an interface as well, but this is not the
> case.  Doing
>
>  grep 'is(\w\+\s*==\s*class)' *.d
>
> on the Phobos sources reveals many cases where the test for
> is(T==interface) has most likely been forgotten.  This should be fixed,
> and I think the best way is to add the following to std.traits:
>
>  template isClass(T)
>  {
>      enum isClass = is(T == class) || is(T == interface);
>  }
>
> Most instances of is(T==class) in Phobos can then be replaced with
> isClass!T.
>
> What say you?
>
> -Lars
>
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