bindfp2.hpp

C++ Templates 完全导引范例

/* The following code example is taken from the book
 * "C++ Templates - The Complete Guide"
 * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002
 *
 * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.
 */
// convenience function to bind a function pointer with two parameters
template<int PNum, typename RT, typename P1, typename P2>
inline
Binder<FunctionPtr<RT,P1,P2>,
       PNum,
       BoundVal<typename FunctorParam<FunctionPtr<RT,P1,P2>,
                                      PNum
                                     >::Type
               >
      >
bindfp (RT (*fp)(P1,P2),
        typename ForwardParamT
                   <typename FunctorParam<FunctionPtr<RT,P1,P2>,
                                          PNum
                                         >::Type  
                   >::Type val)
{
    return Binder<FunctionPtr<RT,P1,P2>,
                  PNum,
                  BoundVal
                    <typename FunctorParam<FunctionPtr<RT,P1,P2>,
                                           PNum
                                          >::Type
                    >
                 >(func_ptr(fp),
                   BoundVal<typename FunctorParam
                              <FunctionPtr<RT,P1,P2>,
                               PNum
                              >::Type
                           >(val)
                  );
}