error: out-of-line definition of 'test' does not match any declaration in 'B'

I have a small problem that is killing me!! I don't know what seems to be wrong with the below code. I should be able to implement the function that is inherited from the super class, shouldn't I? but I get error: out-of-line definition of 'test' does not match any declaration in 'B<dim>'

template <int dim> class A { public: virtual double test() const ; }; template <int dim> class B : public A <dim> { }; template <int dim> double B<dim>::test () const { return 0; } 

I am on a Mac using clang (Apple LLVM version 5.1).

2 Answers

Try

template <int dim> class B : public A <dim> { public: virtual double test () const; }; // Function definition template <int dim> double B<dim>::test () const { return 0; } 

You still need to define the function declared the class declaration.

The problem is that you are trying to define function test outside the class definition of class B. You have to declare it at first in the class

template <int dim> class B : public A <dim> { double test() const; };