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00070 #ifndef KYRA_CIRCLELIST_INCLUDED
00071 #define KYRA_CIRCLELIST_INCLUDED
00072
00073 #include "../util/gldebug.h"
00074
00075
00076
00077
00078
00079
00080 template <class T>
00081 struct GlCircleNode
00082 {
00083 T data;
00084
00085 GlCircleNode<T>* next;
00086 GlCircleNode<T>* prev;
00087 };
00088
00089
00090
00091
00092 template <class T>
00093 class GlCircleList
00094 {
00095 public:
00096 GlCircleList() { sentinel.next = &sentinel; sentinel.prev = &sentinel; }
00097 ~GlCircleList() { Clear(); }
00098
00099 bool Empty() const { return sentinel.next == &sentinel; }
00100 T& Front() const { return sentinel.next->data; }
00101 T& Back() const { return sentinel.prev->data; }
00102 GlCircleNode<T>* FrontNode() const { return sentinel.next; }
00103 GlCircleNode<T>* BackNode() const { return sentinel.prev; }
00104
00105 void Clear() { GlCircleNode<T>* temp;
00106 while( sentinel.next != &sentinel )
00107 {
00108 temp = sentinel.next;
00109 sentinel.next = sentinel.next->next;
00110 delete temp;
00111 }
00112 sentinel.prev = &sentinel;
00113 }
00114 void PushFront( const T& insert ) {
00115 GlCircleNode<T>* node = new GlCircleNode<T>;
00116 node->data = insert;
00117
00118 node->prev = &sentinel;
00119 node->next = sentinel.next;
00120 sentinel.next->prev = node;
00121 sentinel.next = node;
00122 }
00123 void PushBack( const T& insert ) {
00124 GlCircleNode<T>* node = new GlCircleNode<T>;
00125 node->data = insert;
00126
00127 node->prev = sentinel.prev;
00128 node->next = &sentinel;
00129 sentinel.prev->next = node;
00130 sentinel.prev = node;
00131 }
00132 void PopFront() {
00133 GLASSERT( sentinel.next != &sentinel );
00134 GlCircleNode<T>* node = sentinel.next;
00135
00136
00137
00138 Delete( node );
00139 }
00140 void PopBack() {
00141 GLASSERT( sentinel.prev != &sentinel );
00142 GlCircleNode<T>* node = sentinel.prev;
00143
00144
00145
00146 Delete( node );
00147 }
00148
00149 void Delete( GlCircleNode<T>* node ) {
00150 GLASSERT( node != &sentinel );
00151 node->prev->next = node->next;
00152 node->next->prev = node->prev;
00153 delete node;
00154 }
00155 GlCircleNode<T>* Find( T value ) {
00156 GlCircleNode<T>* node = sentinel.next;
00157 while ( node != &sentinel )
00158 {
00159 if ( node->data == value )
00160 return node;
00161 node = node->next;
00162 }
00163 return 0;
00164 }
00165
00166
00167 GlCircleNode<T> sentinel;
00168 };
00169
00170
00171 template <class T>
00172 class GlCircleListIterator
00173 {
00174 public:
00175 GlCircleListIterator( GlCircleList<T>& _list ) : current( 0 ), list( &_list ) {}
00176
00177 void Begin() { current = list->sentinel.next; }
00178 void Next() { current = current->next; }
00179 void Prev() { current = current->prev; }
00180 bool Done() { return ( current == &(list->sentinel) ); }
00181
00183 T& Current() { return (current->data); }
00184
00185 void InsertBefore( const T& addMe )
00186 {
00187 GlCircleNode<T>* node = new GlCircleNode<T>;
00188 node->data = addMe;
00189
00190 node->prev = current->prev;
00191 node->next = current;
00192 current->prev->next = node;
00193 current->prev = node;
00194 }
00195
00196 void InsertAfter( const T& addMe )
00197 {
00198 GlCircleNode<T>* node = new GlCircleNode<T>;
00199 node->data = addMe;
00200
00201 node->prev = current;
00202 node->next = current->next;
00203 current->next->prev = node;
00204 current->next = node;
00205 }
00206
00207 void Remove()
00208 {
00209 GLASSERT( current != &(list->sentinel) );
00210
00211 GlCircleNode<T>* temp = current;
00212 current = current->next;
00213
00214 temp->prev->next = temp->next;
00215 temp->next->prev = temp->prev;
00216 delete temp;
00217 }
00218
00219 private:
00220 GlCircleNode<T>* current;
00221 GlCircleList<T>* list;
00222 };
00223
00224
00225 #endif