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/*
* Copyright 2002 Adrian Thurston <thurston@colm.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _AAPL_BUBBLESORT_H
#define _AAPL_BUBBLESORT_H
#ifdef AAPL_NAMESPACE
namespace Aapl {
#endif
/**
* \addtogroup sort
* @{
*/
/**
* \class BubbleSort
* \brief Bubble sort an array of data.
*
* BubbleSort can be used to sort any array of objects of type T provided a
* compare class is given. BubbleSort is in-place. It does not require any
* temporary storage.
*
* Objects are not made aware that they are being moved around in memory.
* Assignment operators, constructors and destructors are never invoked by the
* sort.
*
* BubbleSort runs in O(n^2) time. It is most useful when sorting arrays that
* are nearly sorted. It is best when neighbouring pairs are out of place.
* BubbleSort is a stable sort, meaning that objects with the same key have
* their relative ordering preserved.
*/
/*@}*/
/* BubbleSort. */
template <class T, class Compare> class BubbleSort
: public Compare
{
public:
/* Sorting interface routine. */
void sort(T *data, long len);
};
/**
* \brief Bubble sort an array of data.
*/
template <class T, class Compare> void BubbleSort<T,Compare>::
sort(T *data, long len)
{
bool changed = true;
for ( long pass = 1; changed && pass < len; pass ++ ) {
changed = false;
for ( long i = 0; i < len-pass; i++ ) {
/* Do we swap pos with the next one? */
if ( this->compare( data[i], data[i+1] ) > 0 ) {
char tmp[sizeof(T)];
/* Swap the two items. */
memcpy( tmp, data+i, sizeof(T) );
memcpy( data+i, data+i+1, sizeof(T) );
memcpy( data+i+1, tmp, sizeof(T) );
/* Note that we made a change. */
changed = true;
}
}
}
}
#ifdef AAPL_NAMESPACE
}
#endif
#endif /* _AAPL_BUBBLESORT_H */
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