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#include "Node.hpp" |
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template <typename Type> |
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template<typename Type> |
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class NullNode : public Node<Type> |
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{ |
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private: |
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bool null; |
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NullNode<Type>* next; |
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NullNode<Type>* previous; |
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public: |
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NullNode() : null(true) {} |
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NullNode(const Type& value) : Node<Type>::Node(value), null(true) {} |
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NullNode(const Type& value) : Node<Type>::Node(value), null(false) {} |
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~NullNode() {} |
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void addNext(const Type& value); |
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void addPrevious(const Type& value); |
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void removeNext(void); |
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void removePrevious(void); |
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void setNext(NullNode<Type>* next) { this->next = next; } |
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void setPrevious(NullNode<Type>* previous) { this->previous = previous; } |
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NullNode<Type>* getNext(void) const { return next; } |
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NullNode<Type>* getPrevious(void) const { return next; } |
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bool contains(const Type& value, NullNode<Type>* end); |
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}; |
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template<typename Type> |
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void NullNode<Type>::removeNext(void) |
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{ |
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NullNode<Type>* behind = next->next; |
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delete next; |
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next = behind; |
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} |
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template<typename Type> |
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void NullNode<Type>::removePrevious(void) |
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bool NullNode<Type>::contains(const Type& value, NullNode<Type>* end) |
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{ |
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NullNode<Type>* ahead = previous->previous; |
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delete previous; |
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NullNode<Type>* another = Node<Type>::getNext() != NULL ? |
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Node<Type>::getNext() : Node<Type>::getPrevious(); |
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previous = ahead; |
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if (null && end == this) |
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{ |
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return false; |
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} |
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else if (!null && value == Node<Type>::getValue()) |
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{ |
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return true; |
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} |
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else return another->contains(value, end); |
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} |
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#endif // _NullNode_hpp_ |
