diff options
Diffstat (limited to 'src/aapl/bubblesort.h')
| -rw-r--r-- | src/aapl/bubblesort.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/aapl/bubblesort.h b/src/aapl/bubblesort.h new file mode 100644 index 00000000..42482991 --- /dev/null +++ b/src/aapl/bubblesort.h @@ -0,0 +1,95 @@ +/* + * 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 */ |