Added a sortedlist template class to libmaxsi/sortedlist.h.
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2 changed files with 319 additions and 0 deletions
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@ -67,6 +67,7 @@ process.h \
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types.h \
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format.h \
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keyboard.h \
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sortedlist.h \
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sortix-vga.h \
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sortix-keyboard.h \
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sortix-sound.h \
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318
libmaxsi/hsrc/sortedlist.h
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318
libmaxsi/hsrc/sortedlist.h
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/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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This file is part of LibMaxsi.
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LibMaxsi is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
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sortedlist.h
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A container that ensures its elements are always sorted when they are
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accessed. It also provides binary search.
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******************************************************************************/
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#ifndef LIBMAXSI_SORTEDLIST_H
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#define LIBMAXSI_SORTEDLIST_H
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#ifndef SIZE_MAX
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#error Define __STDC_LIMIT_MACROS before including <stdint.h>
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#endif
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namespace Maxsi
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{
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template <class T> class SortedList
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{
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public:
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// GCC appears to be broken as the const in the function pointer typedef
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// below is ignored for some reason. Is it a compiler bug?
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typedef int (*compare_t)(const T, const T);
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private:
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static const int FLAG_SORTED = (1<<0);
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private:
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T* list;
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size_t listused;
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size_t listlength;
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compare_t comparator;
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unsigned flags;
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public:
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SortedList(compare_t thecomparator = NULL) :
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list(NULL),
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listused(0),
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listlength(0),
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comparator(thecomparator),
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flags(0)
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{
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}
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~SortedList()
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{
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Clear();
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}
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public:
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void SetComparator(compare_t thecomparator)
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{
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comparator = thecomparator;
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flags &= ~FLAG_SORTED;
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}
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void Clear()
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{
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for ( size_t i = 0; i < listused; i++ )
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{
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list[i].~T();
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}
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listused = 0;
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flags |= FLAG_SORTED;
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delete[] list;
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list = NULL;
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}
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size_t Length()
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{
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return listused;
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}
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bool Empty()
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{
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return !listused;
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}
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bool IsSorted()
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{
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return (flags & FLAG_SORTED);
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}
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void Sort(compare_t thecomparator)
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{
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comparator = thecomparator;
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Sort();
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}
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void Sort()
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{
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if ( !listused || (flags & FLAG_SORTED) ) { return; }
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MergeSort(0, listused-1);
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flags |= FLAG_SORTED;
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}
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void Invalidate()
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{
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flags &= ~FLAG_SORTED;
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}
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bool Add(T t)
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{
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if ( listused == listlength && !Expand() ) { return false; }
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list[listused++] = t;
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flags &= ~FLAG_SORTED;
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return true;
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}
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T Get(size_t index)
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{
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if ( !(flags & FLAG_SORTED) ) { Sort(); }
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return list[index];
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}
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// Accesses the elements, but the order might not be sorted.
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T GetUnsorted(size_t index)
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{
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return list[index];
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}
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T Remove(size_t index)
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{
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if ( !(flags & FLAG_SORTED) ) { Sort(); }
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T result = list[listused-1];
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if ( index == listused-1 )
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{
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list[--listused].~T();
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}
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else
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{
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list[index].~T();
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list[index] = list[--listused];
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list[listused].~T();
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flags &= ~FLAG_SORTED;
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}
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return result;
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}
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size_t Search(T searchee)
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{
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return Search(comparator, searchee);
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}
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// Returns the index of the element being searched for using the given
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// comparator, or returns SIZE_MAX if not found.
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template <class Searchee> size_t Search(int (*searcher)(const T t, const Searchee searchee), const Searchee searchee)
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{
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if ( !listused ) { return SIZE_MAX; }
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if ( flags & FLAG_SORTED ) { Sort(); }
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size_t minindex = 0;
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size_t maxindex = listused-1;
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do
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{
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size_t tryindex = (minindex + maxindex) / 2;
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const T& t = list[tryindex];
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int relation = searcher(t, searchee);
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if ( relation == 0 ) { return tryindex; }
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if ( relation < 0 ) { minindex = tryindex+1; }
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if ( relation > 0 ) { maxindex = tryindex-1; }
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} while ( maxindex + 1 != minindex );
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return SIZE_MAX;
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}
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private:
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bool Expand()
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{
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size_t newsize = (listused == 0 ) ? 4 : listlength*2;
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T* newlist = new T[newsize*2];
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if ( !newlist ) { return false; }
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for ( size_t i = 0; i < listused; i++ )
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{
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newlist[i] = list[i];
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list[i].~T();
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}
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delete[] list;
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list = newlist;
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listlength = newsize;
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return true;
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}
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T* GetDestList()
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{
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return list + listlength;
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}
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void MergeSort(size_t minindex, size_t maxindex)
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{
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FixupMergeSort(minindex, maxindex);
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}
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void FixupMergeSort(size_t minindex, size_t maxindex)
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{
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MergeSortInternal(minindex, maxindex);
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T* destlist = GetDestList();
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do
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{
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list[minindex] = destlist[minindex];
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} while ( minindex++ != maxindex );
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}
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void MergeSortInternal(size_t minindex, size_t maxindex)
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{
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T* destlist = GetDestList();
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if ( maxindex - minindex == 1 )
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{
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if ( 0 < comparator(list[minindex], list[maxindex]) )
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{
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destlist[minindex] = list[maxindex];
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destlist[maxindex] = list[minindex];
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list[minindex].~T();
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list[maxindex].~T();
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}
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else
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{
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destlist[minindex] = list[minindex];
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destlist[maxindex] = list[maxindex];
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list[minindex].~T();
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list[maxindex].~T();
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}
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return;
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}
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if ( minindex == maxindex )
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{
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destlist[minindex] = list[minindex];
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list[minindex].~T();
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return;
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}
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const size_t asize = (maxindex - minindex + 1) / 2 + 1;
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const size_t bsize = (maxindex - minindex) / 2;
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const size_t astart = minindex;
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const size_t bstart = minindex + asize;
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const size_t aend = minindex + asize - 1;
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const size_t bend = minindex + asize + bsize - 1;
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FixupMergeSort(astart, aend);
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FixupMergeSort(bstart, bend);
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destlist += minindex;
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size_t aindex = astart;
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size_t bindex = bstart;
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while ( aindex <= aend && bindex <= bend )
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{
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int relation = comparator(list[aindex], list[bindex]);
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if ( relation <= 0 )
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{
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*destlist++ = list[aindex];
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list[aindex++].~T();
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}
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else
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{
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*destlist++ = list[bindex];
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list[bindex++].~T();
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}
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}
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while ( aindex <= aend )
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{
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*destlist++ = list[aindex];
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list[aindex++].~T();
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}
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while ( bindex <= bend )
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{
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*destlist++ = list[bindex];
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list[bindex++].~T();
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}
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}
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};
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}
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#endif
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