Template function inside template class

Question

I have this code:

template <class T> class MyClass { public: template <class U> void foo() { U a; a.invoke(); } }; 

I want this in this form:

 template <class T> class MyClass { public: template <class U> void foo(); }; template <class T> /* ????? */ void MyClass<T>::foo() { U a; a.invoke(); } 

How can i do this? What is the correct syntax?

Answer 1

Write this:

 template <class T> template <class U> void MyClass<T>::foo() { /* ... */ }