question about local class in a function

Hello,
    Can any one explain why the following code cannot get compiled ??
Thanks.

#include <iostream>
#include <string>
#include <vector>
#include <iterator>
#include <algorithm>

using namespace std;

int main(int argc, char* argv[])
{
  struct A
  {
    void operator()(int i)
    {
       cout << i <<  endl;
    }
  };

  vector<int> v(3);

  for_each( v.begin(), v.end(), A() );

  return 0;
}

c.cpp: In function 'int main(int, char**)':
c.cpp:21: error: no matching function for call to
'for_each(__gnu_cxx::__normal_iterator<int*, std::vector<int,
std::allocator<int> > >, __gnu_cxx::__normal_iterator<int*,
std::vector<int, std::allocator<int> > >, main(int, char**)::A)'