invalid_type.h

#pragma once
 
namespace cgv {
        namespace type {
 
struct invalid_type {};
 
template <typename T>
struct is_valid
{
        static const int value = 1;
};
template <>
struct is_valid<invalid_type>
{
        static const int value = 0;
};
 
template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
struct count_valid_types
{
        static const int value = is_valid<T1>::value + is_valid<T2>::value + is_valid<T3>::value + is_valid<T4>::value + is_valid<T5>::value + is_valid<T6>::value + is_valid<T7>::value + is_valid<T8>::value;
};
 
        }
}