is_base_of.h

#pragma once
 
#if !defined(_MSC_VER) || (_MSC_VER < 1400)
#include <tr1/type_traits>
#include <cgv/type/func/drop_const.h>
#endif
 
namespace cgv {
        namespace type {
                namespace cond {
 
template <typename base_type, typename derived_type>
struct is_base_of 
{ 
        static const bool value =  
#if _MSC_VER >= 1400
                        __is_base_of(base_type,derived_type);
#else
                std::tr1::is_base_of<typename func::drop_const<base_type>::type,
                                                                   typename func::drop_const<derived_type>::type>::value;
#endif
};
 
                }
        }
}