class Base
{};
class Derived : public Base
{};

template <class T, class Enabler=void>
class Partialy
{
public:
    void say()
    {
        std::cout << "Partialy Default" << std::endl;
    }
};

template <class T>
class Partialy<T, typename std::enable_if<std::is_base_of< Base, T >::value>::type>
{
public:
    void say()
    {
        std::cout << "Partialy special" << std::endl;
    }
};

template <class T>
class BaseTpl
{};
class DerivedTpl : public BaseTpl<int>
{};

template <class T, class Ta>
class Partialy<T, typename std::enable_if<std::is_base_of< BaseTpl<Ta>, T >::value>::type>
{
public:
    void say()
    {
        std::cout << "Partialy special with TPL" << std::endl;
    }
};

class A1 : public BaseTpl<int>
class A2 : public BaseTpl<std::string>
class A3 : public BaseTpl<vector<int> >
...

class DerivedTpl : public BaseTpl<int>, public BaseTpl<char>
{};

class BaseNonTpl {};

template <class T>
class BaseTpl : BaseNonTpl
{};

template <class T>
class PartialyTpl<T, typename std::enable_if<std::is_base_of< BaseNonTpl, T >::value>::type>