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513 lines
13 KiB
C++
513 lines
13 KiB
C++
/// \file
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/// \brief \b [Internal] Array based list. Usually the Queue class is used instead, since it has all the same functionality and is only worse at random access.
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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.jenkinssoftware.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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#ifndef __LIST_H
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#define __LIST_H
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#include <assert.h>
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#include <string.h> // memmove
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#include "Export.h"
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/// Maximum unsigned long
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static const unsigned int MAX_UNSIGNED_LONG = 4294967295U;
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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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/// \brief Array based implementation of a list.
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/// \note ONLY USE THIS FOR SHALLOW COPIES. I don't bother with operator= to improve performance.
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template <class list_type>
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class RAK_DLL_EXPORT List
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{
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public:
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/// Default constructor
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List();
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/// Destructor
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~List();
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/// Copy constructor
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/// \param[in] original_copy The list to duplicate
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List( const List& original_copy );
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/// Assign one list to another
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List& operator= ( const List& original_copy );
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/// Access an element by its index in the array
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/// \param[in] position The index into the array.
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/// \return The element at position \a position.
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list_type& operator[] ( const unsigned int position ) const;
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/// Push an element at the end of the stack
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/// \param[in] input The new element.
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void Push(const list_type input);
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/// Pop an element from the end of the stack
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/// \pre Size()>0
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/// \return The element at the end.
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list_type& Pop(void);
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/// Insert an element at position \a position in the list
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/// \param[in] input The new element.
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/// \param[in] position The position of the new element.
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void Insert( const list_type input, const unsigned int position );
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/// Insert at the end of the list.
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/// \param[in] input The new element.
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void Insert( const list_type input );
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/// Replace the value at \a position by \a input. If the size of
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/// the list is less than @em position, it increase the capacity of
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/// the list and fill slot with @em filler.
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/// \param[in] input The element to replace at position @em position.
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/// \param[in] filler The element use to fill new allocated capacity.
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/// \param[in] position The position of input in the list.
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void Replace( const list_type input, const list_type filler, const unsigned int position );
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/// Replace the last element of the list by \a input .
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/// \param[in] input The element used to replace the last element.
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void Replace( const list_type input );
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/// Delete the element at position \a position.
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/// \param[in] position The index of the element to delete
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void RemoveAtIndex( const unsigned int position );
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/// Delete the element at position \a position.
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/// \note - swaps middle with end of list, only use if list order does not matter
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/// \param[in] position The index of the element to delete
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void RemoveAtIndexFast( const unsigned int position );
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/// Delete the element at the end of the list
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void RemoveFromEnd(const unsigned num=1);
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/// Returns the index of the specified item or MAX_UNSIGNED_LONG if not found
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/// \param[in] input The element to check for
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/// \return The index or position of @em input in the list.
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/// \retval MAX_UNSIGNED_LONG The object is not in the list
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/// \retval [Integer] The index of the element in the list
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unsigned int GetIndexOf( const list_type input ) const;
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/// \return The number of elements in the list
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unsigned int Size( void ) const;
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/// Clear the list
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void Clear( bool doNotDeallocateSmallBlocks=false );
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// Preallocate the list, so it needs fewer reallocations at runtime
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void Preallocate( unsigned countNeeded );
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/// Frees overallocated members, to use the minimum memory necessary
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/// \attention
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/// This is a slow operation
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void Compress( void );
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private:
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/// An array of user values
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list_type* listArray;
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/// Number of elements in the list
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unsigned int list_size;
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/// Size of \a array
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unsigned int allocation_size;
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};
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template <class list_type>
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List<list_type>::List()
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{
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allocation_size = 0;
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listArray = 0;
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list_size = 0;
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}
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template <class list_type>
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List<list_type>::~List()
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{
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if (allocation_size>0)
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delete [] listArray;
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}
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template <class list_type>
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List<list_type>::List( const List& original_copy )
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{
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// Allocate memory for copy
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if ( original_copy.list_size == 0 )
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{
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list_size = 0;
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allocation_size = 0;
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}
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else
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{
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listArray = new list_type [ original_copy.list_size ];
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for ( unsigned int counter = 0; counter < original_copy.list_size; ++counter )
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listArray[ counter ] = original_copy.listArray[ counter ];
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// Don't call constructors, assignment operators, etc.
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//memcpy(listArray, original_copy.listArray, original_copy.list_size*sizeof(list_type));
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list_size = allocation_size = original_copy.list_size;
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}
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}
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template <class list_type>
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List<list_type>& List<list_type>::operator= ( const List& original_copy )
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{
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if ( ( &original_copy ) != this )
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{
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Clear();
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// Allocate memory for copy
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if ( original_copy.list_size == 0 )
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{
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list_size = 0;
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allocation_size = 0;
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}
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else
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{
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listArray = new list_type [ original_copy.list_size ];
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for ( unsigned int counter = 0; counter < original_copy.list_size; ++counter )
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listArray[ counter ] = original_copy.listArray[ counter ];
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// Don't call constructors, assignment operators, etc.
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//memcpy(listArray, original_copy.listArray, original_copy.list_size*sizeof(list_type));
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list_size = allocation_size = original_copy.list_size;
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}
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}
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return *this;
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}
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template <class list_type>
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inline list_type& List<list_type>::operator[] ( const unsigned int position ) const
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{
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#ifdef _DEBUG
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if (position>=list_size)
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{
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assert ( position < list_size );
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}
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#endif
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return listArray[ position ];
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}
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template <class list_type>
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void List<list_type>::Push(const list_type input)
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{
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Insert(input);
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}
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template <class list_type>
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inline list_type& List<list_type>::Pop(void)
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{
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#ifdef _DEBUG
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assert(list_size>0);
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#endif
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--list_size;
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return listArray[list_size];
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}
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template <class list_type>
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void List<list_type>::Insert( const list_type input, const unsigned int position )
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{
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#ifdef _DEBUG
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if (position>list_size)
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{
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assert( position <= list_size );
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}
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#endif
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// Reallocate list if necessary
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if ( list_size == allocation_size )
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{
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// allocate twice the currently allocated memory
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list_type * new_array;
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if ( allocation_size == 0 )
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allocation_size = 16;
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else
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allocation_size *= 2;
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new_array = new list_type [ allocation_size ];
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// copy old array over
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for ( unsigned int counter = 0; counter < list_size; ++counter )
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new_array[ counter ] = listArray[ counter ];
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// Don't call constructors, assignment operators, etc.
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//memcpy(new_array, listArray, list_size*sizeof(list_type));
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// set old array to point to the newly allocated and twice as large array
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delete[] listArray;
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listArray = new_array;
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}
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// Move the elements in the list to make room
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for ( unsigned int counter = list_size; counter != position; counter-- )
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listArray[ counter ] = listArray[ counter - 1 ];
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// Don't call constructors, assignment operators, etc.
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//memmove(listArray+position+1, listArray+position, (list_size-position)*sizeof(list_type));
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// Insert the new item at the correct spot
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listArray[ position ] = input;
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++list_size;
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}
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template <class list_type>
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void List<list_type>::Insert( const list_type input )
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{
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// Reallocate list if necessary
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if ( list_size == allocation_size )
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{
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// allocate twice the currently allocated memory
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list_type * new_array;
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if ( allocation_size == 0 )
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allocation_size = 16;
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else
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allocation_size *= 2;
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new_array = new list_type [ allocation_size ];
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if (listArray)
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{
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// copy old array over
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for ( unsigned int counter = 0; counter < list_size; ++counter )
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new_array[ counter ] = listArray[ counter ];
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// Don't call constructors, assignment operators, etc.
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//memcpy(new_array, listArray, list_size*sizeof(list_type));
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// set old array to point to the newly allocated and twice as large array
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delete[] listArray;
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}
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listArray = new_array;
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}
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// Insert the new item at the correct spot
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listArray[ list_size ] = input;
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++list_size;
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}
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template <class list_type>
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inline void List<list_type>::Replace( const list_type input, const list_type filler, const unsigned int position )
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{
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if ( ( list_size > 0 ) && ( position < list_size ) )
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{
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// Direct replacement
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listArray[ position ] = input;
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}
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else
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{
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if ( position >= allocation_size )
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{
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// Reallocate the list to size position and fill in blanks with filler
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list_type * new_array;
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allocation_size = position + 1;
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new_array = new list_type [ allocation_size ];
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// copy old array over
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for ( unsigned int counter = 0; counter < list_size; ++counter )
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new_array[ counter ] = listArray[ counter ];
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// Don't call constructors, assignment operators, etc.
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//memcpy(new_array, listArray, list_size*sizeof(list_type));
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// set old array to point to the newly allocated array
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delete[] listArray;
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listArray = new_array;
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}
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// Fill in holes with filler
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while ( list_size < position )
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listArray[ list_size++ ] = filler;
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// Fill in the last element with the new item
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listArray[ list_size++ ] = input;
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#ifdef _DEBUG
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assert( list_size == position + 1 );
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#endif
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}
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}
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template <class list_type>
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inline void List<list_type>::Replace( const list_type input )
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{
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if ( list_size > 0 )
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listArray[ list_size - 1 ] = input;
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}
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template <class list_type>
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void List<list_type>::RemoveAtIndex( const unsigned int position )
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{
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#ifdef _DEBUG
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if (position >= list_size)
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{
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assert( position < list_size );
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return;
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}
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#endif
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if ( position < list_size )
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{
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// Compress the array
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for ( unsigned int counter = position; counter < list_size - 1 ; ++counter )
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listArray[ counter ] = listArray[ counter + 1 ];
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// Don't call constructors, assignment operators, etc.
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// memmove(listArray+position, listArray+position+1, (list_size-1-position) * sizeof(list_type));
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RemoveFromEnd();
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}
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}
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template <class list_type>
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void List<list_type>::RemoveAtIndexFast( const unsigned int position )
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{
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#ifdef _DEBUG
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if (position >= list_size)
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{
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assert( position < list_size );
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return;
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}
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#endif
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--list_size;
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listArray[position]=listArray[list_size];
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}
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template <class list_type>
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inline void List<list_type>::RemoveFromEnd( const unsigned num )
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{
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// Delete the last elements on the list. No compression needed
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#ifdef _DEBUG
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assert(list_size>=num);
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#endif
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list_size-=num;
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}
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template <class list_type>
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unsigned int List<list_type>::GetIndexOf( const list_type input ) const
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{
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for ( unsigned int i = 0; i < list_size; ++i )
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if ( listArray[ i ] == input )
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return i;
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return MAX_UNSIGNED_LONG;
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}
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template <class list_type>
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inline unsigned int List<list_type>::Size( void ) const
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{
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return list_size;
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}
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template <class list_type>
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void List<list_type>::Clear( bool doNotDeallocateSmallBlocks )
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{
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if ( allocation_size == 0 )
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return;
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if (allocation_size>512 || doNotDeallocateSmallBlocks==false)
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{
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delete [] listArray;
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allocation_size = 0;
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listArray = 0;
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}
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list_size = 0;
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}
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template <class list_type>
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void List<list_type>::Compress( void )
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{
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list_type * new_array;
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if ( allocation_size == 0 )
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return ;
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new_array = new list_type [ allocation_size ];
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// copy old array over
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for ( unsigned int counter = 0; counter < list_size; ++counter )
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new_array[ counter ] = listArray[ counter ];
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// Don't call constructors, assignment operators, etc.
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//memcpy(new_array, listArray, list_size*sizeof(list_type));
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// set old array to point to the newly allocated array
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delete[] listArray;
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listArray = new_array;
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}
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template <class list_type>
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void List<list_type>::Preallocate( unsigned countNeeded )
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{
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unsigned amountToAllocate = allocation_size;
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if (allocation_size==0)
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amountToAllocate=16;
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while (amountToAllocate < countNeeded)
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amountToAllocate<<=1;
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if ( allocation_size < amountToAllocate)
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{
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// allocate twice the currently allocated memory
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list_type * new_array;
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allocation_size=amountToAllocate;
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new_array = new list_type [ allocation_size ];
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if (listArray)
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{
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// copy old array over
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for ( unsigned int counter = 0; counter < list_size; ++counter )
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new_array[ counter ] = listArray[ counter ];
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// Don't call constructors, assignment operators, etc.
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//memcpy(new_array, listArray, list_size*sizeof(list_type));
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// set old array to point to the newly allocated and twice as large array
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delete[] listArray;
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}
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listArray = new_array;
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}
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}
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} // End namespace
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#endif
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