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/*
* Copyright 2001 Adrian Thurston <thurston@complang.org>
*/
/* This file is part of Aapl.
*
* Aapl is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* Aapl 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 Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Aapl; if not, write to the Free Software Foundation, Inc., 59
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _AAPL_COMPARE_H
#define _AAPL_COMPARE_H
#include <string.h>
#include "table.h"
#ifdef AAPL_NAMESPACE
namespace Aapl {
#endif
/**
* \defgroup compare Compare
* \brief Basic compare clases.
*
* Compare classes are used by data structures that need to know the relative
* ordering of elemets. To become a compare class, a class must imlement a
* routine long compare(const T &key1, const T &key2) that behaves just like
* strcmp.
*
* Compare classes are passed to the template data structure as a template
* parameter and are inherited. In most cases the compare routine will base
* the key comparision only on the two keys and the compare routine can
* therefore be static. Though sometimes it is useful to include data in the
* compare class and use this data in the comparison. For example the compare
* class may contain a pointer to some other data structure to which the
* comparison is delegated.
*
* @{
*/
/**
* \brief Compare a type for which < and > are implemented.
*
* CmpOrd is suitable for simple types such as integers and pointers that by
* default have the less-than and greater-than operators defined.
*/
template <class T> struct CmpOrd
{
/**
* \brief Compare two ordinal types.
*
* This compare routine copies its arguements in by value.
*/
static inline long compare(const T k1, const T k2)
{
if (k1 < k2)
return -1;
else if (k1 > k2)
return 1;
else
return 0;
}
};
/**
* \brief Compare two tables of type T
*
* Table comparison is useful for keying a data structure on a vector or
* binary search table. T is the element type stored in the table.
* CompareT is the comparison structure used to compare the individual values
* in the table.
*/
template < class T, class CompareT = CmpOrd<T> > struct CmpTable
: public CompareT
{
/**
* \brief Compare two tables storing type T.
*/
static inline long compare(const Table<T> &t1, const Table<T> &t2)
{
if ( t1.tabLen < t2.tabLen )
return -1;
else if ( t1.tabLen > t2.tabLen )
return 1;
else
{
T *i1 = t1.data, *i2 = t2.data;
long len = t1.tabLen, cmpResult;
for ( long pos = 0; pos < len;
pos += 1, i1 += 1, i2 += 1 )
{
cmpResult = CompareT::compare(*i1, *i2);
if ( cmpResult != 0 )
return cmpResult;
}
return 0;
}
}
};
/**
* \brief Compare two tables of type T -- non-static version.
*
* CmpTableNs is identical to CmpTable, however the compare routine is
* non-static. If the CompareT class contains a non-static compare, then this
* version must be used because a static member cannot invoke a non-static
* member.
*
* Table comparison is useful for keying a data structure on a vector or binary
* search table. T is the element type stored in the table. CompareT
* is the comparison structure used to compare the individual values in the
* table.
*/
template < class T, class CompareT = CmpOrd<T> > struct CmpTableNs
: public CompareT
{
/**
* \brief Compare two tables storing type T.
*/
inline long compare(const Table<T> &t1, const Table<T> &t2)
{
if ( t1.tabLen < t2.tabLen )
return -1;
else if ( t1.tabLen > t2.tabLen )
return 1;
else
{
T *i1 = t1.data, *i2 = t2.data;
long len = t1.tabLen, cmpResult;
for ( long pos = 0; pos < len;
pos += 1, i1 += 1, i2 += 1 )
{
cmpResult = CompareT::compare(*i1, *i2);
if ( cmpResult != 0 )
return cmpResult;
}
return 0;
}
}
};
/**
* \brief Compare two implicitly shared tables of type T
*
* This table comparison is for data structures based on implicitly
* shared tables.
*
* Table comparison is useful for keying a data structure on a vector or
* binary search table. T is the element type stored in the table.
* CompareT is the comparison structure used to compare the individual values
* in the table.
*/
template < class T, class CompareT = CmpOrd<T> > struct CmpSTable : public CompareT
{
/**
* \brief Compare two tables storing type T.
*/
static inline long compare(const STable<T> &t1, const STable<T> &t2)
{
long t1Length = t1.length();
long t2Length = t2.length();
/* Compare lengths. */
if ( t1Length < t2Length )
return -1;
else if ( t1Length > t2Length )
return 1;
else {
/* Compare the table data. */
T *i1 = t1.data, *i2 = t2.data;
for ( long pos = 0; pos < t1Length;
pos += 1, i1 += 1, i2 += 1 )
{
long cmpResult = CompareT::compare(*i1, *i2);
if ( cmpResult != 0 )
return cmpResult;
}
return 0;
}
}
};
/**
* \brief Compare two implicitly shared tables of type T -- non-static
* version.
*
* This is a non-static table comparison for data structures based on
* implicitly shared tables. If the CompareT class contains a non-static
* compare, then this version must be used because a static member cannot
* invoke a non-static member.
*
* Table comparison is useful for keying a data structure on a vector or
* binary search table. T is the element type stored in the table.
* CompareT is the comparison structure used to compare the individual values
* in the table.
*/
template < class T, class CompareT = CmpOrd<T> > struct CmpSTableNs
: public CompareT
{
/**
* \brief Compare two tables storing type T.
*/
inline long compare(const STable<T> &t1, const STable<T> &t2)
{
long t1Length = t1.length();
long t2Length = t2.length();
/* Compare lengths. */
if ( t1Length < t2Length )
return -1;
else if ( t1Length > t2Length )
return 1;
else {
/* Compare the table data. */
T *i1 = t1.data, *i2 = t2.data;
for ( long pos = 0; pos < t1Length;
pos += 1, i1 += 1, i2 += 1 )
{
long cmpResult = CompareT::compare(*i1, *i2);
if ( cmpResult != 0 )
return cmpResult;
}
return 0;
}
}
};
/*@}*/
#ifdef AAPL_NAMESPACE
}
#endif
#endif /* _AAPL_COMPARE_H */
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