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#include <iostream>
 
using namespace std;
 
class OverVoid{
public:
 
    virtual ~OverVoid(){
    };
};
 
class Meta : public OverVoid{
 
};
 
template <typename T>
struct is_overvoid_or_meta
{
     static const bool value = false;
};
 
template <> struct is_overvoid_or_meta<OverVoid>
{
     static const bool value = true;
};
 
template <> struct is_overvoid_or_meta<Meta>
{
     static const bool value = true;
};
 
template<typename _Ty>
class Move
{
     typedef typename std::enable_if<is_overvoid_or_meta<_Ty>::value, _Ty>::type Type;
};
 
int main()
{
	Move<OverVoid> m1;
	Move<Meta> m2;
	Move<int> m3;
	return 0;
}

prog.cpp: In instantiation of 'class Move<int>':
prog.cpp:42:12:   required from here
prog.cpp:35:82: error: no type named 'type' in 'struct std::enable_if<false, int>'
      typedef typename std::enable_if<is_overvoid_or_meta<_Ty>::value, _Ty>::type Type;
                                                                                  ^

Standard output is empty