ATL / WTL / STL

class DeleteValue : public std::unary_function<std::pair<int const,char *>&, void>
{
public:
  void operator()(std::pair<int const,char *>& pairObject)
  {
    delete [] pairObject.second;
  }
};

template <class func1_type,class func2_type>
struct composite: public unary_function<func2_type::argument_type,func1_type::result_type>
{
  composite(func1_type f1=func1_type(),func2_type=func2_type()):f1(f1),f2(f2){}
  func1_type::result_type operator()(func2_type::argument_type a)
  {
    return f1(f2(a));
  }
private:
  func1_type f1;
  func2_type f2;
};