CODEWITHSUNDEEP
classfunctiontemplatespure-virtual
user1827609
user1827609

Reputation: 1

pure virtual template functions in a template class

So my instructor handed out some code that I believe does not work at all and I want to get some clarification on it. He used this in his hand out notes (it implies that this is correct).

template<class T>
class State
{
public:
    virtual void Enter(T*)=0;
    virtual void Execute(T*)=0;
    virtual void Exit(T*)=0;
    virtual ~State(){};
};

I can see what he is trying to do but I believe the compiler will not like it at all. Can anyone help explain why this does or does not work.

Upvotes: 0

Views: 1558

Answers (1)

Bok McDonagh
Bok McDonagh

Reputation: 1447

This should work as none of the member functions are not template member functions. The base class arguments can be deduced at compile-time, and the actual function to call can still be determined at runtime.

If you had this:

class Foo
{
    template< typename T > virtual void Bar( T * ) = 0;
};

You would have problems as there is no way to generate functions to handle all the potential types that may be passed into this function at compile time.

Upvotes: 2

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