Re: Template Problem

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#define TESTCASE 2

#include <iterator>
#include <iostream>

class Point
{
public:
     double x;
     double y;
};

class VertexBase
{
public:
     Point point;
};

class Vertex : public VertexBase
{
public:
     int someExtraInfo;
};

template <class V>
class Mesh
{
public:
     typedef V Vertex;

     class VertexIterator : public
       std::iterator<std::bidirectional_iterator_tag,
#if (TESTCASE == 0)
// The code compiles in this case, but this is not the data type that
I actually
// want to use here.
       VertexBase,
#elif (TESTCASE == 1)
// This results in a compile error. See below.
       Vertex,
#elif (TESTCASE == 2)
// This results in a compile error. See below.
       V,
#endif
       ptrdiff_t>
     {
     private:
// NOTE: This line is the problematic one in the cases where a
compile
// error is obtained. In particular, I get: "pointer" does not name a
type.
         pointer vertex_;

     };
};

template class Mesh<Vertex>;
template class Mesh<VertexBase>;
typedef Mesh<Vertex> MyMesh1;
typedef Mesh<VertexBase> MyMesh2;

int main(int argc, char **argv)
{
     MyMesh1 mesh1;
     MyMesh2 mesh2;
}
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