Problem with functor in g++

[okronglis]

Hi,

I am having trouble compiling some templated code that uses functors in
g++.  It compiles fine in VC8.  Any idea what I could do to make this
work with g++?

code:

#include <iostream>

using namespace std;

template <class T>
class add
{
public:
  T& operator()(T& t1, const T& t_inc)
  {
    t1 += t_inc;
    return t1;
  }
};

template <class T, class addition = add<T> >
class A
{
private:
  T m_start;
  T m_end;

public:
  A(){}
  ~A(){}

  void initialize(const T& start, const T& end)
  {
    m_start = start;
    m_end = end;
  }

  template <class output_functor>
  void do_loop(output_functor& o)
  {
    T var = m_start;
    for ( int n = 0; var <= m_end; ++n )
    {
      o(var);
      addition()(var,static_cast<T>(1));
    }
  }
};

struct output
{
  void operator()(const int n)
  {
    cout << n << ", ";
  }
};

int main(int argc, char* argv[])
{
  A<int> a_int;

  a_int.initialize(1,10);
  a_int.do_loop(output());

  getchar();
        return 0;
}



Output from g++:

tst.cpp: In function 'int main(int, char**)':
tst.cpp:58: error: no matching function for call to 'A(int,add<int>
>::do_loop(output)'
tst.cpp:35: note: candidates are: void A<T,
addition>::do_loop(output_functor&) [with output_functor = output, T =
int, addition = add<int>]


Thanks,

Stefan