variable.h

精确的函数表达模板,里面包含了许多C和C++的函数表达模板

/****************************************************************************
 * Copyright (C) 2001        Piece Wise Functions
 *                           Carlo Galotto
 *                           Italy
 *                           Email: [e-mail]
 *                                  [e-mail]
 *
 *
 * This framework is free  software; you can  redistribute it and/or modify
 * it. This framework is distributed  in the  hope  that  it  will  be useful,
 * but WITHOUT ANY WARRANTY;  without even the   implied  warranty of
 * MERCHANTABILITY  or FITNESS FOR A PARTICULAR PURPOSE.
 * The proposed framework is based upon the paper "Expression Templates" by
 * Todd Veldhuizen.
 ****************************************************************************/

 // Class: Variable

#ifndef __VARIABLE_H          //Required for current class
  #define __VARIABLE_H

                              
#ifndef __EXPR_H               //Required for base classes
  #include "Expr.h"
#endif

#ifndef __IDNTTEXP_H          //Required for base classes
  #include "IdentityExpr.h"
#endif

   // A shortcut for e.g. Expr< IdentityExpr<float> >  x;
   template <class T>
   class Variable : public Expr< IdentityExpr<T> >

   {

      public:

         typedef typename IdentityExpr<T>::argument_type argument_type;
         typedef typename IdentityExpr<T>::result_type result_type;

      public:

         // Default constructor

         Variable() : Expr< IdentityExpr<T> >( IdentityExpr<T>() ) {}


   };
#endif