Callback Enumeration APIs & the Input Iterator Concept

Listing 1: Enumerating through the full range, then storing items in a container.

#include <windows.h>
#include <list>

typedef std::list<HWND>   HWND_list_t;
BOOL CALLBACK ChildWindowProc(HWND hwnd, HWND_list_t &wndlist)
{
  return (wndlist.push_back(hwnd), TRUE);
}
void main()
{
  HWND_list_t  wndlist;
  if(::EnumChildWindows(0, (WNDENUMPROC)ChildWindowProc, (LPARAM)&wndlist))
  {
    HWND_list_t::const_iterator  begin = wndlist.begin();
    HWND_list_t::const_iterator  end   = wndlist.end();
    for(; begin != end; ++begin)
    {
      fprintf(stdout, "HWND: 0x%08x\n", *begin);
    }
  }
}