RE: [boost] Re: [MPL] Making Generators

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2002-12-06 07:14:46

David B. Held wrote:
> > In "C++ Templates: The Complete Guide" (Recommended), they give
> > this example on pages 106-107:
> >
> >  typedef char RT1;
> >  typedef struct {char a[2];} RT2;
> >  template<typename T> RT1 test(typename T::X const*);
> >  template<typename T> RT2 test(...);
> >
> >  #define type_has_member_type_X(T) \
> >          (sizeof(test<T>(0) == 1)
> 
> This is cool.  What compilers are known to support it?

MPL's implementation ("boost/mpl/aux_/has_xxx.hpp") is known to work on
Comeau, Intel (all versions), MSVC (all versions), Metroweks 8.3/8.2 and GCC
3.2. There is no known way to make it work on Borland. You can test it
against any other compiler by trying out
"boost/libs/mpl/test/aux_/has_xxx.cpp" test case.

Aleksey