gcc 4.6.1でコードをコンパイルできない

以下のコードはVS2010でうまくコンパイルされますが、gcc 4.6.1でコンパイルしたくありません。

#ifndef IS_CHAR_H_INCLUDED
#define IS_CHAR_H_INCLUDED
#include 

template
struct Is_Char_
{
    enum {value = false};
};

template<>
struct Is_Char_
{
    enum {value = true};
};

template<>
struct Is_Char_
{
    enum {value = true};
};

template<>
struct Is_Char_
{
    enum {value = true};
};

template
struct Is_Char : Is_Char_::type>
{

};

#endif//IS_CHAR_H_INCLUDED

#ifndef PROMOTE_H_INCLUDED
#define PROMOTE_H_INCLUDED
#include 
#include 
#include 
#include 
#include 
#include 
   //#include "Is_Char.h" doesn't have to be here this file is pasted above


/*Promotes Integer type to one up in size range*/
template
struct Promote
{
    static_assert(std::is_integral::value,"Non Integer type is not allowed.");
    /*Check correct type - depending on Integer being signed or unsigned*/
    typedef typename std::conditional::value,
                                boost::mpl::vector,
    boost::mpl::vector
                                     >::type types;
    /*
    Find this type from the list above - substituting Integer for signed or unsigned char iff Integer is of type char
    */
    typedef typename boost::mpl::find::value,
    typename std::conditional::value,signed char,unsigned char>::type, Integer>::type>::type this_type;

    /*If Integer is int and if size of it is == to long promote int to long long (iterate to next element twice)*/
    typedef typename boost::mpl::eval_if::value || std::is_same::value)
                                                                && (sizeof(int) == sizeof(long)))>,
                                         boost::mpl::next::type>,
                                         boost::mpl::next<this_type>
                                        >::type next_type;
    /*Check if iterator points within range or if one pass end which means that Integer was u/long long*/
    typedef typename std::conditional::type,next_type>::value,Integer,typename boost::mpl::deref::type>::type type;
};

#endif//PROMOTE_H_INCLUDED