How to forward declare a template class in namespace std?

Question

#ifndef __TEST__
#define __TEST__

namespace std
{
    template
    class list;
}

template
void Pop(std::list * l)
{
           


        

Answer 1

there is a limited alternative you can use

header:

class std_int_vector;

class A{
    std_int_vector* vector;
public:
    A();
    virtual ~A();
};

cpp:

#include "header.h"
#include 
class std_int_vector: public std::vectror {}

A::A() : vector(new std_int_vector()) {}
[...]

not tested in real programs, so expect it to be non-perfect.