[boost] Re: mpl apply_if.hpp question

From: Larry Evans (cppljevans_at_[hidden])
Date: 2004-10-13 14:00:27

On 10/13/2004 01:47 PM, Larry Evans wrote:
> That's probably not the problem, because with this input:
> 
> <-------------
> #include <boost/mpl/eval_if.hpp>
> struct A{};
> struct B{};
> struct C{};
> typedef boost::mpl::eval_if<A,B,C>::type X;
> X x;
>  >-------------
> 
> compilation succeeds.

OOPS. Forgot to rm the -E flag.  The following:

<----------------
#include <boost/mpl/eval_if.hpp>
struct C
{
     static bool const value=true;
};
struct f1
{};
struct f2
{};
namespace boost{namespace mpl{

typedef  eval_if<C,f1,f2>::type X;
X x;

}}

 >----------------
gets error:
<----------------
test.cpp(12): error: class "boost::mpl::eval_if<C, f1, f2>" has no 
member "type"
   typedef  eval_if<C,f1,f2>::type X;
                              ^
 >----------------