模板内部模板类

Question

I have a class that looks like this:

template <typename P>
class Pack {
    Public:
          template <typename X>
    Private:
          Other T <other>
};

I want to write the function outside of the class but I am having difficulties defining the header.. I tried something like this:

template <typename X>
int Pack<X>::pop(X led) const{
  // Do something in here with Other from the private above
}

But this does not work it keeps saying "Out of line definition of pop, does not match any definitions of P.

Any help is appreciated thanks!

Clarification: Trying to Implement the function stub so I can write the code outside of the class.

Answer 1

Your code looks incomplete and you're posting small chunks of it from time to time but I believe this syntax is what you want:

#include <iostream>
using namespace std;

template <typename P>
class Stack {
    public:
          template <typename X> int pop(X pred) const;
};

template <typename P> 
template<typename X>
int Stack<P>::pop(X pred) const{
    return 0;
}

int main() {

    Stack<bool> obj;
    char a;
    obj.pop(a);

    return 0;
}

http://ideone.com/Cp69hg