what is correct syntax for partial specialization of template template

Question

Hi can anyone please explain what is the correct syntax for partial specialization of template template? or is it even possible? any help is much appreciated

template < typename A >
class X
{


};

template < typename B >
class Y
{


};

template < template< typename > class U, class T >
class Z
{   
    // there are other methods in class which i don't want to replicate
    void func();  // want to specialize this for class X
};

template < template< typename > class U, class T >
void Z< U, T >::func()
{
    std::cout << " this is done ";
}

// specialize this for X
template < template< typename > class U, class T >
void Z< X, T >::func()
{

}

Answer 1

You cannot specialise just a part of a class template. When you partially specialise a class template, you need to provide the entire declaration, not just a single function.

And you cannot partially specialise a function template.

You might be able to do what you want with inheritance. You could collect the shared methods in a base class, and then define a templated derived class with a partial specialisation for the methods with exceptions.