cppvalue.h

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/******************************************************************************
 *
 * Copyright (C) 1997-2021 by Dimitri van Heesch.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation under the terms of the GNU General Public License is hereby
 * granted. No representations are made about the suitability of this software
 * for any purpose. It is provided "as is" without express or implied warranty.
 * See the GNU General Public License for more details.
 *
 * Documents produced by Doxygen are derivative works derived from the
 * input used in their production; they are not affected by this license.
 *
 */
 
#ifndef CPPVALUE_H
#define CPPVALUE_H
 
#include <cstdio>
#include <string>
 
/** A class representing a C-preprocessor value. */
class CPPValue
{
  public:
    enum Type { Int, Float };
 
    explicit CPPValue(char c) : type(Int) { v.l = c; }
    explicit CPPValue(long val=0) : type(Int) { v.l = val; }
    explicit CPPValue(double val) : type(Float) { v.d = val; }
 
    operator double () const { return type==Int ? static_cast<double>(v.l) : v.d; }
    operator long ()   const { return type==Int ? v.l : static_cast<long>(v.d);   }
 
    bool isInt() const { return type == Int; }
 
    void print() const
    {
      if (type==Int)
        printf("(%ld)\n",v.l);
      else
        printf("(%f)\n",v.d);
    }
    static CPPValue parseOctal(const std::string& token);
    static CPPValue parseDecimal(const std::string& token);
    static CPPValue parseHexadecimal(const std::string& token);
    static CPPValue parseBinary(const std::string& token);
    static CPPValue parseCharacter(const std::string& token);
    static CPPValue parseFloat(const std::string& token);
 
  private:
    Type type;
    union {
      double d;
      long l;
    } v;
};
 
 
#endif