On Mon, Aug 25, 2014 at 05:10:18PM +0000, via Digitalmars-d-learn wrote:
> On Monday, 25 August 2014 at 17:05:48 UTC, H. S. Teoh via Digitalmars-d-learn wrote:
> >On Mon, Aug 25, 2014 at 03:48:10PM +0000, Jeremy DeHaan via Digitalmars-d-learn wrote:
> >>I've done things like this before with traits and I figured that this way should work as well, but it gives me errors instead. Perhaps someone can point out my flaws.
> >>
> >>immutable(T)[] toString(T)(const(T)* str)
> >>	if(typeof(T) is dchar)//this is where the error is
> >
> >The correct syntax is:
> >
> >	if (is(typeof(T) == dchar))
> 
> Almost... T is already a type; typeof(T) doesn't compile.

Ah, right, it should be simply: if (is(T == dchar))

Should've read more carefully before replying. :-P


T

-- 
It only takes one twig to burn down a forest.

On 08/25/14 18:52, Jonathan M Davis via Digitalmars-d-learn wrote:
> Another commonly used one is is(typeof(foo)). typeof(foo) gets the type of foo
> and will result in void if foo doesn't exist, and is(void) is false, whereas

D is not quite that simple. ;)

   static assert(is(void)==true);

(a) `typeof(invalid)` is an error;
(b) the `is(...)` expression swallows errors;

hence (a)+(b) ->

   static assert(is(typeof(invalid))==false);

artur