Public API Reference

csutil/comparator.h

Go to the documentation of this file.

/*
  Template providing various comparison and ordering functions.
  Copyright (C) 2005 by Eric Sunshine

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  This library 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.  See the GNU
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public
  License along with this library; if not, write to the Free
  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __CSUTIL_COMPARATOR_H__
#define __CSUTIL_COMPARATOR_H__

class csString;
class csStringBase;

template <class T1, class T2>
class csComparator
{
public:
  static int Compare(T1 const &r1, T2 const &r2)
  {
    if (r1 < r2) return -1;
    else if (r2 < r1) return 1;
    else return 0;
  }
};

template <class T>
class csComparatorString
{
public:
  static int Compare (T const& r1, T const& r2)
  {
    if (((const char*)r1) == 0)
    {
      return (((const char*)r2) == 0) ? 0 : 1;
    }
    else if (((const char*)r2) == 0)
    {
      return -1;
    }
    return strcmp ((const char*)r1, (const char*)r2);
  }
};

template<>
class csComparator<const char*, const char*> :
  public csComparatorString<const char*> {};

template<>
class csComparator<csString, csString> :
  public csComparatorString<csString> {};
template<>
class csComparator<csStringBase, csStringBase> :
  public csComparatorString<csStringBase> {};
template<class T>
class csComparatorStruct
{
public:
  static int Compare (T const& r1, T const& r2)
  {
    return memcmp (&r1, &r2, sizeof (T));
  }
};

#endif // __CSUTIL_COMPARATOR_H__

---