Re: [boost] Fun, only handled by vc6/7!

From: Paul Mensonides (pmenso57_at_[hidden])
Date: 2003-01-12 17:59:01

----- Original Message -----
From: "David Abrahams" <dave_at_[hidden]>

> The latter.  It was just an experiment.  Fortunately, nothing I'm
> doing depends very much on it.  It was prompted by the fact that
> Borland 5.51 can handle enable_if, but not in a templated constructor:
>
> template <class T>
> struct X
> {
>     template <class U>
>     X(X<U> const&, typename enable_if<some_property_of<U>::value,
int*>::type = 0);
         ^
It chokes here?  Is it legal to use the template parameter 'U' in a
non-deduced context like that?  I'm curious because I thought that it wasn't
(though I could be wrong).

> }
>
> The parser chokes on the first '<' inside the parens.
>
> I was going to try attacking it from the other direction, by defining
> a conversion operator.

Interesting.  It was a herculean effort though!

Paul Mensonides