literal.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: Literal                     //ANSI C++

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


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

#ifndef __LTRLEXPR_H       //Required for base classes
  #include "LiteralExpr.h"
#endif

  // A shortcut for e.g. Expr< LiteralExpr<double, bool> > literal = true;
  // A shortcut for e.g. Expr< LiteralExpr<int> > literal = 2;

  template <class argT, class resT = argT>

   class Literal : public Expr< LiteralExpr<argT, resT> >
   {

      public:

         typedef typename LiteralExpr<argT, resT>::argument_type argument_type;
         typedef typename LiteralExpr<argT, resT>::result_type result_type;

      public:


         //Default constructor

         Literal()

          : Expr< LiteralExpr<argT, resT> >(LiteralExpr<argT, resT>()) {}


         // Conversion constructor

         Literal(const resT & c)

          : Expr< LiteralExpr<argT, resT> >(LiteralExpr<argT, resT>(c)) {}


         // Destructor

         ~Literal() {}

   };


#endif