[Boost-users] boost::mpl and VS 2005

Subject: [Boost-users] boost::mpl and VS 2005
From: narinder.claire_at_[hidden]
Date: 2011-07-12 07:57:55

Hi,

The following piece of code compile successfully on VS2008,VS2010 & GCC 
4.5.2 but fails to compile on VS2005.
Is the likely to be because of a bug in VS2005 ? (boost v 1.46.1)
------------------------------------------------------------
#include<iostream>
#include<string>

#include<boost/tr1/type_traits.hpp>
#include<boost/mpl/empty.hpp>
#include<boost/mpl/vector.hpp>
#include<boost/mpl/filter_view.hpp> 
#include<boost/utility.hpp>

template<class T>
struct  is_recognised_type
{
    static const bool value =false;
};

typedef   boost::mpl::vector<std::string>  naked_variant_type_list;

struct myclass
{
    myclass(){}

    template<class T>
    myclass(const T&t, 
            const typename 
boost::disable_if_c<is_recognised_type<T>::value,T >::type * ptr =0,
            const typename boost::disable_if_c<
                    boost::mpl::empty<
                       typename boost::mpl::filter_view<
 naked_variant_type_list,boost::is_convertible<T,boost::mpl::_> 
                            >::type>::value>::type * pt =0,
            const typename boost::enable_if_c<
                    boost::mpl::empty<
                       typename boost::mpl::filter_view<
 naked_variant_type_list,std::tr1::is_base_of<boost::mpl::_,T> 
                            >::type>::value>::type * pt2 =0)
    {
    }

}; 

int main()
{
    myclass m;
    m = "hello";
}

------------------------------------------------------------

My workaround is to collapse  is_convertible and is_base_of into a
single type_trait is_convertible_but_not_derived_from. and then it works.
The problems seems to be that there are two trait checks, using either one 
individualy
seems to work.

Rgds
Narinder

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