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c++自定义迭代器，如跳表，怎么实现

news 2025/11/26 14:57:53

在C++中，跳表是一种高效的数据结构，用于存储有序数据并支持快速查找、插入和删除操作。为了在C++类中实现跳表迭代器，你需要定义一个迭代器类，并在跳表类中提供相应的接口。以下是一个简单的实现示例：

#include <iostream>
#include <vector>// 定义跳表节点
template<typename T>
struct SkipListNode {T value;std::vector<SkipListNode*> next;SkipListNode(const T& value) : value(value) {}
};// 定义跳表迭代器
template<typename T>
class SkipListIterator {
public:SkipListIterator(SkipListNode<T>* node) : current(node) {}// 前置递增运算符SkipListIterator& operator++() {if (current) {current = current->next[0];}return *this;}// 后置递增运算符SkipListIterator operator++(int) {SkipListIterator old = *this;++(*this);return old;}// 解引用运算符T& operator*() {return current->value;}// 指针运算符T* operator->() {return &(current->value);}// 比较运算符bool operator==(const SkipListIterator& other) const {return current == other.current;}bool operator!=(const SkipListIterator& other) const {return !(*this == other);}private:SkipListNode<T>* current;
};// 定义跳表类
template<typename T>
class SkipList {
public:SkipList() : head(new SkipListNode<T>()) {}// 插入元素void insert(const T& value) {// 实现跳表插入逻辑}// 删除元素void remove(const T& value) {// 实现跳表删除逻辑}// 获取迭代器SkipListIterator<T> begin() {return SkipListIterator<T>(head->next[0]);}SkipListIterator<T> end() {return SkipListIterator<T>(nullptr);}private:SkipListNode<T>* head;
};int main() {SkipList<int> skiplist;skiplist.insert(10);skiplist.insert(20);skiplist.insert(30);for (SkipListIterator<int> it = skiplist.begin(); it != skiplist.end(); ++it) {std::cout << *it << std::endl;}return 0;
}