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#include <iostream>
using namespace std;
 
template<class T>
class CMemoryPool
{
public:
    CMemoryPool(int param1)
        : stuff(param1)
    {}
 
private:
    T stuff;
};
 
template<class T>
class CList
{
public:
    struct Entry
    {
        T data;
    };
 
    static CMemoryPool<Entry> s_pool;
};
 
template<class T>
CList<T>::CMemoryPool<typename CList<T>::Entry>::s_pool(1);
 
int main()
{
    CList<int> list;
}

prog.cpp:29:11: error: non-template ‘CMemoryPool’ used as template
 CList<T>::CMemoryPool<typename CList<T>::Entry>::s_pool(1);
           ^
prog.cpp:29:11: note: use ‘CList<T>::template CMemoryPool’ to indicate that it is a template
prog.cpp:29:1: error: need ‘typename’ before ‘CList<T>::CMemoryPool’ because ‘CList<T>’ is a dependent scope
 CList<T>::CMemoryPool<typename CList<T>::Entry>::s_pool(1);
 ^
prog.cpp: In function ‘int main()’:
prog.cpp:33:16: warning: unused variable ‘list’ [-Wunused-variable]
     CList<int> list;
                ^

Standard output is empty