I think you cant do it like that, You probably should use SFINAE to solve something like this:
//C++11 version
template<typename T>
struct IsCircle
{
private:
template<typename Z>
constexpr static bool _is(typename Z::MyCirlce*) //if Z dont have `MyCirlce` then this function is removed
{
return true;
}
template<typename Z>
constexpr static bool _is(...) //fallback function
{
return false;
}
public:
static const bool VALUE = _is<T>(nullptr);
};
//C++98 version
template<typename T>
struct IsCircle
{
private:
struct a { char a; }; //size ~1
struct b { char a[8]; }; //size ~8
template<typename Z>
static b _is(typename Z::MyCirlce*);
template<typename Z>
static a _is(...);
public:
static const bool VALUE = sizeof(_is<T>(0)) == sizeof(b);
};