ATL / WTL / STL

<br />
#include <map><br />
#include <iostream><br />
#include <utility><br />
#include <algorithm><br />
#include <string><br />
<br />
<br />
typedef std::map<std::string,std::string> StringMap;<br />
<br />
struct update<br />
   {<br />
   void operator() ( StringMap::value_type& v ) const<br />
      {<br />
      if ( v.first == "second" )<br />
         v.second = "replaced value";<br />
      }<br />
   };<br />
<br />
struct print<br />
   {<br />
   void operator() ( StringMap::value_type& v ) const<br />
      {<br />
      std::cout << "first = " << v.first << ", second = " << v.second << std::endl;<br />
      }<br />
   };<br />
<br />
int main( int argc, char* argv[] )<br />
   {<br />
   StringMap testMap;<br />
   <br />
   testMap.insert( StringMap::value_type("first", "1") );<br />
   testMap.insert( StringMap::value_type("second", "2") );<br />
   testMap.insert( StringMap::value_type("third", "3") );<br />
   testMap.insert( StringMap::value_type("fourth", "4") );<br />
   testMap.insert( StringMap::value_type("fifth", "5") );<br />
   <br />
   std::for_each(testMap.begin(), testMap.end(), print());<br />
   std::for_each(testMap.begin(), testMap.end(), update());<br />
   std::for_each(testMap.begin(), testMap.end(), print());<br />
   <br />
   return 0;<br />
   }<br />

HRESULT STDMETHODCALLTYPE put_Font(IFontDisp* pFont)
{
    ...
    __if_exists(T::OnFontChanged) 
    {
        pT->OnFontChanged();
    }
    ...
}