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# irrList.h

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    00001 // Copyright (C) 2002-2009 Nikolaus Gebhardt
    00002 // This file is part of the "Irrlicht Engine".
    00003 // For conditions of distribution and use, see copyright notice in irrlicht.h
    00004
    00005 #ifndef __IRR_LIST_H_INCLUDED__
    00006 #define __IRR_LIST_H_INCLUDED__
    00007
    00008 #include "irrTypes.h"
    00009 #include "irrAllocator.h"
    00010 #include "irrMath.h"
    00011
    00012 namespace irr
    00013 {
    00014 namespace core
    00015 {
    00016
    00017
    00019 template <class T>
    00020 class list
    00021 {
    00022 private:
    00023
    00025         struct SKListNode
    00026         {
    00027                 SKListNode(const T& e) : Next(0), Prev(0), Element(e) {}
    00028
    00029                 SKListNode* Next;
    00030                 SKListNode* Prev;
    00031                 T Element;
    00032         };
    00033
    00034 public:
    00035         class ConstIterator;
    00036
    00038         class Iterator
    00039         {
    00040         public:
    00041                 Iterator() : Current(0) {}
    00042
    00043                 Iterator& operator ++()    { Current = Current->Next; return *this; }
    00044                 Iterator& operator --()    { Current = Current->Prev; return *this; }
    00045                 Iterator  operator ++(s32) { Iterator tmp = *this; Current = Current->Next; return tmp; }
    00046                 Iterator  operator --(s32) { Iterator tmp = *this; Current = Current->Prev; return tmp; }
    00047
    00048                 Iterator& operator +=(s32 num)
    00049                 {
    00050                         if(num > 0)
    00051                         {
    00052                                 while (num-- && this->Current != 0) ++(*this);
    00053                         }
    00054                         else
    00055                         {
    00056                                 while(num++ && this->Current != 0) --(*this);
    00057                         }
    00058                         return *this;
    00059                 }
    00060
    00061                 Iterator  operator + (s32 num) const { Iterator tmp = *this; return tmp += num; }
    00062                 Iterator& operator -=(s32 num) const { return (*this)+=(-num); }
    00063                 Iterator  operator - (s32 num) const { return (*this)+ (-num); }
    00064
    00065                 bool operator ==(const Iterator&      other) const { return Current == other.Current; }
    00066                 bool operator !=(const Iterator&      other) const { return Current != other.Current; }
    00067                 bool operator ==(const ConstIterator& other) const { return Current == other.Current; }
    00068                 bool operator !=(const ConstIterator& other) const { return Current != other.Current; }
    00069
    00070                 #if defined (_MSC_VER) && (_MSC_VER < 1300)
    00071                         #pragma warning(disable:4284) // infix notation problem when using iterator operator ->
    00072                 #endif
    00073
    00074                 T & operator * () { return Current->Element; }
    00075                 T * operator ->() { return &Current->Element; }
    00076
    00077         private:
    00078                 explicit Iterator(SKListNode* begin) : Current(begin) {}
    00079
    00080                 SKListNode* Current;
    00081
    00082                 friend class list<T>;
    00083                 friend class ConstIterator;
    00084         };
    00085
    00087         class ConstIterator
    00088         {
    00089         public:
    00090
    00091                 ConstIterator() : Current(0) {}
    00092                 ConstIterator(const Iterator& iter) : Current(iter.Current)  {}
    00093
    00094                 ConstIterator& operator ++()    { Current = Current->Next; return *this; }
    00095                 ConstIterator& operator --()    { Current = Current->Prev; return *this; }
    00096                 ConstIterator  operator ++(s32) { ConstIterator tmp = *this; Current = Current->Next; return tmp; }
    00097                 ConstIterator  operator --(s32) { ConstIterator tmp = *this; Current = Current->Prev; return tmp; }
    00098
    00099                 ConstIterator& operator +=(s32 num)
    00100                 {
    00101                         if(num > 0)
    00102                         {
    00103                                 while(num-- && this->Current != 0) ++(*this);
    00104                         }
    00105                         else
    00106                         {
    00107                                 while(num++ && this->Current != 0) --(*this);
    00108                         }
    00109                         return *this;
    00110                 }
    00111
    00112                 ConstIterator  operator + (s32 num) const { ConstIterator tmp = *this; return tmp += num; }
    00113                 ConstIterator& operator -=(s32 num) const { return (*this)+=(-num); }
    00114                 ConstIterator  operator - (s32 num) const { return (*this)+ (-num); }
    00115
    00116                 bool operator ==(const ConstIterator& other) const { return Current == other.Current; }
    00117                 bool operator !=(const ConstIterator& other) const { return Current != other.Current; }
    00118                 bool operator ==(const Iterator&      other) const { return Current == other.Current; }
    00119                 bool operator !=(const Iterator&      other) const { return Current != other.Current; }
    00120
    00121                 const T & operator * () { return Current->Element; }
    00122                 const T * operator ->() { return &Current->Element; }
    00123
    00124                 ConstIterator & operator =(const Iterator & iterator) { Current = iterator.Current; return *this; }
    00125
    00126         private:
    00127                 explicit ConstIterator(SKListNode* begin) : Current(begin) {}
    00128
    00129                 SKListNode* Current;
    00130
    00131                 friend class Iterator;
    00132                 friend class list<T>;
    00133         };
    00134
    00136         list()
    00137                 : First(0), Last(0), Size(0) {}
    00138
    00139
    00141         list(const list<T>& other) : First(0), Last(0), Size(0)
    00142         {
    00143                 *this = other;
    00144         }
    00145
    00146
    00148         ~list()
    00149         {
    00150                 clear();
    00151         }
    00152
    00153
    00155         void operator=(const list<T>& other)
    00156         {
    00157                 if(&other == this)
    00158                 {
    00159                         return;
    00160                 }
    00161
    00162                 clear();
    00163
    00164                 SKListNode* node = other.First;
    00165                 while(node)
    00166                 {
    00167                         push_back(node->Element);
    00168                         node = node->Next;
    00169                 }
    00170         }
    00171
    00172
    00174
    00175         u32 size() const
    00176         {
    00177                 return Size;
    00178         }
    00179         u32 getSize() const
    00180         {
    00181                 return Size;
    00182         }
    00183
    00184
    00186
    00187         void clear()
    00188         {
    00189                 while(First)
    00190                 {
    00191                         SKListNode * next = First->Next;
    00192                         allocator.destruct(First);
    00193                         allocator.deallocate(First);
    00194                         First = next;
    00195                 }
    00196
    00197                 //First = 0; handled by loop
    00198                 Last = 0;
    00199                 Size = 0;
    00200         }
    00201
    00202
    00204
    00205         bool empty() const
    00206         {
    00207                 return (First == 0);
    00208         }
    00209
    00210
    00212
    00213         void push_back(const T& element)
    00214         {
    00215                 SKListNode* node = allocator.allocate(1);
    00216                 allocator.construct(node, element);
    00217
    00218                 ++Size;
    00219
    00220                 if (First == 0)
    00221                         First = node;
    00222
    00223                 node->Prev = Last;
    00224
    00225                 if (Last != 0)
    00226                         Last->Next = node;
    00227
    00228                 Last = node;
    00229         }
    00230
    00231
    00233
    00234         void push_front(const T& element)
    00235         {
    00236                 SKListNode* node = allocator.allocate(1);
    00237                 allocator.construct(node, element);
    00238
    00239                 ++Size;
    00240
    00241                 if (First == 0)
    00242                 {
    00243                         Last = node;
    00244                         First = node;
    00245                 }
    00246                 else
    00247                 {
    00248                         node->Next = First;
    00249                         First->Prev = node;
    00250                         First = node;
    00251                 }
    00252         }
    00253
    00254
    00256
    00257         Iterator begin()
    00258         {
    00259                 return Iterator(First);
    00260         }
    00261
    00262
    00264
    00265         ConstIterator begin() const
    00266         {
    00267                 return ConstIterator(First);
    00268         }
    00269
    00270
    00272
    00273         Iterator end()
    00274         {
    00275                 return Iterator(0);
    00276         }
    00277
    00278
    00280
    00281         ConstIterator end() const
    00282         {
    00283                 return ConstIterator(0);
    00284         }
    00285
    00286
    00288
    00289         Iterator getLast()
    00290         {
    00291                 return Iterator(Last);
    00292         }
    00293
    00294
    00296
    00297         ConstIterator getLast() const
    00298         {
    00299                 return ConstIterator(Last);
    00300         }
    00301
    00302
    00304
    00308         void insert_after(const Iterator& it, const T& element)
    00309         {
    00310                 SKListNode* node = allocator.allocate(1);
    00311                 allocator.construct(node, element);
    00312
    00313                 node->Next = it.Current->Next;
    00314
    00315                 if (it.Current->Next)
    00316                         it.Current->Next->Prev = node;
    00317
    00318                 node->Prev = it.Current;
    00319                 it.Current->Next = node;
    00320                 ++Size;
    00321
    00322                 if (it.Current == Last)
    00323                         Last = node;
    00324         }
    00325
    00326
    00328
    00332         void insert_before(const Iterator& it, const T& element)
    00333         {
    00334                 SKListNode* node = allocator.allocate(1);
    00335                 allocator.construct(node, element);
    00336
    00337                 node->Prev = it.Current->Prev;
    00338
    00339                 if (it.Current->Prev)
    00340                         it.Current->Prev->Next = node;
    00341
    00342                 node->Next = it.Current;
    00343                 it.Current->Prev = node;
    00344                 ++Size;
    00345
    00346                 if (it.Current == First)
    00347                         First = node;
    00348         }
    00349
    00350
    00352
    00354         Iterator erase(Iterator& it)
    00355         {
    00356                 // suggest changing this to a const Iterator& and
    00357                 // working around line: it.Current = 0 (possibly with a mutable, or just let it be garbage?)
    00358
    00359                 Iterator returnIterator(it);
    00360                 ++returnIterator;
    00361
    00362                 if(it.Current == First)
    00363                 {
    00364                         First = it.Current->Next;
    00365                 }
    00366                 else
    00367                 {
    00368                         it.Current->Prev->Next = it.Current->Next;
    00369                 }
    00370
    00371                 if(it.Current == Last)
    00372                 {
    00373                         Last = it.Current->Prev;
    00374                 }
    00375                 else
    00376                 {
    00377                         it.Current->Next->Prev = it.Current->Prev;
    00378                 }
    00379
    00380                 allocator.destruct(it.Current);
    00381                 allocator.deallocate(it.Current);
    00382                 it.Current = 0;
    00383                 --Size;
    00384
    00385                 return returnIterator;
    00386         }
    00387
    00389
    00393         void swap(list<T>& other)
    00394         {
    00395                 core::swap(First, other.First);
    00396                 core::swap(Last, other.Last);
    00397                 core::swap(Size, other.Size);
    00398                 core::swap(allocator, other.allocator); // memory is still released by the same allocator used for allocation
    00399         }
    00400
    00401
    00402 private:
    00403
    00404         SKListNode* First;
    00405         SKListNode* Last;
    00406         u32 Size;
    00407         irrAllocator<SKListNode> allocator;
    00408
    00409 };
    00410
    00411
    00412 } // end namespace core
    00413 }// end namespace irr
    00414
    00415 #endif
    00416

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