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BOOL GL_Window::Initialize ()
{
                ...
   {
   using namespace glGraph;
   g_graph = new CglGraph();
   }
                ...
}

 g_graph = new glGraph::CglGraph();

#include <stdio.h>

namespace ns1
{
    class c1
    {
    public:
        c1() { printf("c1()\n"); };
        ~c1() { printf("~c1()\n"); };
    };
    typedef c1 *c1ptr;
};

int main(int argc, char* argv[])
{
    printf("enter main()\n");
    ns1::c1ptr p;
    {
        p = new ns1::c1();
        delete p;
    }
    printf("exit main()\n");
   return 0;
}

#include <stdio.h>

namespace ns1
{
    class c1
    {
    public:
        c1() { printf("c1()\n"); };
        ~c1() { printf("~c1()\n"); };
    };
    typedef c1 *c1ptr;
};

namespace ns2
{
    class c2
    {
    public:
        c2() { printf("c2()\n"); };
        ~c2() { printf("~c2()\n"); };
        void Initialize();
        ns1::c1ptr p1;
    };
    typedef c2 *c2ptr;
};


void ns2::c2::Initialize()
{
    printf("c2::Initialize()\n");
    p1 = new ns1::c1();
    delete p1;
}


int main(int argc, char* argv[])
{
    printf("enter main()\n");
    ns2::c2ptr p2;
    {
        p2 = new ns2::c2();
        p2->Initialize();
        delete p2;
    }
    printf("exit main()\n");
   return 0;
}

BOOL GL_Window::Initialize () 
{ 
                ... 
   g_graph = new glGraph::CglGraph(); 
                   ... 
}