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237 lines
7.9 KiB
C++
237 lines
7.9 KiB
C++
/// \file
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/// \brief \b [Internal] Quicksort ordered list.
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///
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/// This file is part of RakNet Copyright 2003 Kevin Jenkins.
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///
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/// Usage of RakNet is subject to the appropriate license agreement.
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/// Creative Commons Licensees are subject to the
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/// license found at
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/// http://creativecommons.org/licenses/by-nc/2.5/
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/// Single application licensees are subject to the license found at
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/// http://www.rakkarsoft.com/SingleApplicationLicense.html
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/// Custom license users are subject to the terms therein.
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/// GPL license users are subject to the GNU General Public
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/// License as published by the Free
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/// Software Foundation; either version 2 of the License, or (at your
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/// option) any later version.
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#include "DS_List.h"
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#include "Export.h"
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#ifndef __ORDERED_LIST_H
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#define __ORDERED_LIST_H
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/// The namespace DataStructures was only added to avoid compiler errors for commonly named data structures
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/// As these data structures are stand-alone, you can use them outside of RakNet for your own projects if you wish.
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namespace DataStructures
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{
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template <class key_type, class data_type>
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int defaultOrderedListComparison(const key_type &a, const data_type &b)
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{
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if (a<b) return -1; if (a==b) return 0; return 1;
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}
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/// \note IMPORTANT! If you use defaultOrderedListComparison then call IMPLEMENT_DEFAULT_COMPARISON or you will get an unresolved external linker error.
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)=defaultOrderedListComparison<key_type, data_type> >
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class RAK_DLL_EXPORT OrderedList
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{
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public:
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static void IMPLEMENT_DEFAULT_COMPARISON(void) {DataStructures::defaultOrderedListComparison<key_type, data_type>(key_type(),data_type());}
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OrderedList();
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~OrderedList();
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OrderedList( const OrderedList& original_copy );
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OrderedList& operator= ( const OrderedList& original_copy );
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/// comparisonFunction must take a key_type and a data_type and return <0, ==0, or >0
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/// If the data type has comparison operators already defined then you can just use defaultComparison
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bool HasData(const key_type &key) const;
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unsigned GetIndexFromKey(const key_type &key, bool *objectExists) const;
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data_type GetElementFromKey(const key_type &key);
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unsigned Insert(const key_type &key, const data_type &data);
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unsigned Remove(const key_type &key);
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data_type& operator[] ( const unsigned int position ) const;
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void RemoveAtIndex(const unsigned index);
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void InsertAtIndex(const data_type &data, const unsigned index);
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void InsertAtEnd(const data_type &data);
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void Del(const unsigned num=1);
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void Clear(void);
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unsigned Size(void) const;
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protected:
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DataStructures::List<data_type> orderedList;
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};
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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OrderedList<key_type, data_type, comparison_function>::OrderedList()
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{
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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OrderedList<key_type, data_type, comparison_function>::~OrderedList()
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{
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Clear();
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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OrderedList<key_type, data_type, comparison_function>::OrderedList( const OrderedList& original_copy )
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{
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orderedList=original_copy.orderedList;
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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OrderedList<key_type, data_type, comparison_function>& OrderedList<key_type, data_type, comparison_function>::operator= ( const OrderedList& original_copy )
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{
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orderedList=original_copy.orderedList;
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return *this;
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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bool OrderedList<key_type, data_type, comparison_function>::HasData(const key_type &key) const
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{
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bool objectExists;
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unsigned index;
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index = GetIndexFromKey(key, &objectExists);
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return objectExists;
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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data_type OrderedList<key_type, data_type, comparison_function>::GetElementFromKey(const key_type &key)
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{
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bool objectExists;
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unsigned index;
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index = GetIndexFromKey(key, &objectExists);
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assert(objectExists);
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return orderedList[index];
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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unsigned OrderedList<key_type, data_type, comparison_function>::GetIndexFromKey(const key_type &key, bool *objectExists) const
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{
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int index, upperBound, lowerBound;
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int res;
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if (orderedList.Size()==0)
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{
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*objectExists=false;
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return 0;
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}
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upperBound=(int)orderedList.Size()-1;
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lowerBound=0;
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index = (int)orderedList.Size()/2;
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#ifdef _MSC_VER
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#pragma warning( disable : 4127 ) // warning C4127: conditional expression is constant
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#endif
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while (1)
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{
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res = comparison_function(key,orderedList[index]);
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if (res==0)
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{
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*objectExists=true;
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return index;
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}
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else if (res<0)
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{
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upperBound=index-1;
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}
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else// if (res>0)
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{
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lowerBound=index+1;
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}
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index=lowerBound+(upperBound-lowerBound)/2;
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if (lowerBound>upperBound)
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{
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*objectExists=false;
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return lowerBound; // No match
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}
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}
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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unsigned OrderedList<key_type, data_type, comparison_function>::Insert(const key_type &key, const data_type &data)
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{
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bool objectExists;
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unsigned index;
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index = GetIndexFromKey(key, &objectExists);
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// Don't allow duplicate insertion.
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if (objectExists)
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return (unsigned)-1;
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if (index>=orderedList.Size())
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{
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orderedList.Insert(data);
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return orderedList.Size()-1;
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}
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else
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{
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orderedList.Insert(data,index);
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return index;
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}
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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unsigned OrderedList<key_type, data_type, comparison_function>::Remove(const key_type &key)
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{
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bool objectExists;
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unsigned index;
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index = GetIndexFromKey(key, &objectExists);
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// Can't find the element to remove if this assert hits
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assert(objectExists==true);
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if (objectExists==false)
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return 0;
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orderedList.RemoveAtIndex(index);
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return index;
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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void OrderedList<key_type, data_type, comparison_function>::RemoveAtIndex(const unsigned index)
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{
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orderedList.RemoveAtIndex(index);
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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void OrderedList<key_type, data_type, comparison_function>::InsertAtIndex(const data_type &data, const unsigned index)
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{
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orderedList.Insert(data, index);
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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void OrderedList<key_type, data_type, comparison_function>::InsertAtEnd(const data_type &data)
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{
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orderedList.Insert(data);
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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void OrderedList<key_type, data_type, comparison_function>::Del(const unsigned num)
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{
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orderedList.Del(num);
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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void OrderedList<key_type, data_type, comparison_function>::Clear(void)
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{
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orderedList.Clear();
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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data_type& OrderedList<key_type, data_type, comparison_function>::operator[]( const unsigned int position ) const
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{
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return orderedList[position];
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}
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template <class key_type, class data_type, int (*comparison_function)(const key_type&, const data_type&)>
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unsigned OrderedList<key_type, data_type, comparison_function>::Size(void) const
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{
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return orderedList.Size();
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}
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}
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#endif
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