template within templates problem

Hello,

I have a problem with getting some C++ code to compile with VC++. The code
compiles fine with GCC, but we also need it to work with Visual Studio.

This is a cut down sample of the code that generates the same error.

In the .h
class ClassA
{
public:
    template<template<typename T> class V,typename T> int
convertToContainer(V<T>&) const;
};

In the .cpp
#include "ClassA.h"
#include <vector>

template<template<typename T> class V,typename T>
int ClassA::convertToContainer(V<T>& CT) const
{
  return CT.size();
}

template int ClassA::convertToContainer(std::vector<int>&) const;

The last line throws the following compilation errors
1>Compiling...
1>ClassA.cpp
1>.\ClassA.cpp(11) : error C3190: 'int
ClassA::convertToContainer(std::vector<_Ty> &) const' with the provided
template arguments is not the explicit instantiation of any member function
of 'ClassA'
1> with
1> [
1> _Ty=int
1> ]
1>.\ClassA.cpp(11) : error C2945: explicit instantiation does not refer to a
template-class specialization

I can???t see what is wrong with the template instantiation line. Can anyone
suggest what the problem is?

Regards,
Nick Draper