所谓deque，是"double-ended queue"的缩写;
它是一种动态数组形式，可以向两端发展，在尾部和头部插入元素非常迅速;
在中间插入元素比较费时，因为需要移动其它元素;(No)
双端队列容器，在序列的两端放置和删除元素是高效的;
而vector只是在序列末尾插入才是高效的。
C++ Code
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/* strdeque.cpp 所谓deque，是"double-ended queue"的缩写; 它是一种动态数组形式，可以向两端发展，在尾部和头部插入元素非常迅速; 在中间插入元素比较费时，因为需要移动其它元素;(No) 双端队列容器，在序列的两端放置和删除元素是高效的; 而vector只是在序列末尾插入才是高效的。 */ #include <iostream> #include <deque> using namespace std; int main(void) { //push_front(); //push_back(); //pop_front(); //pop_back(); deque<int> d; d.push_back(1); d.push_back(2); d.push_back(3); d.push_front(0); for (int i = 0; i < d.size(); i++) { cout << "d[" << i << "] = " << d[i] << endl; } d.pop_front(); d[1] = 23; for (int i = 0; i < d.size(); i++) { cout << "d[" << i << "] = " << d[i] << endl; } //迭代器遍历 typedef deque<int>::iterator PITER; for (PITER piter = d.begin(); piter != d.end(); piter++) { cout << *piter << endl; } //大小度量 cout << d.size() << endl; d.resize(10, 23); cout << d.size() << endl; cout << d.max_size() << endl; //返回函数 //begin front rbegin 下同 //end back rend PITER pIter = d.begin(); cout << "The first element is " << *pIter << endl; *pIter = 55; pIter = d.begin(); cout << "The first element is " << *pIter << endl; int &nRet = d.front(); cout << "The first element is " << nRet << endl; typedef deque<int>::reverse_iterator PREVITER; PREVITER pRevIter = d.rbegin(); cout << "The last element is " << *pRevIter << endl; //判断是否为空 if (d.empty()) { cout << "empty" << endl; } //deque访问 deque<char> dchar; dchar.push_back(‘A‘); dchar.push_back(‘B‘); dchar.push_back(‘C‘); dchar.push_back(‘D‘); for (int i = 0; i < dchar.size(); i++) { cout << dchar.at(i) << " "; } cout << endl; //deque重置技术 deque<char> dchar2; dchar2.push_back(‘a‘); dchar2.push_back(‘b‘); dchar2.push_back(‘c‘); dchar2.push_back(‘d‘); dchar.assign(dchar2.begin(), dchar2.end()); for (int i = 0; i < dchar.size(); i++) { cout << dchar.at(i) << " "; } cout << endl; //容器内容交换 deque<int> d1(3, 1); for (int i = 0; i < d1.size(); i++) { cout << d1.at(i) << " "; } cout << endl; deque<int> d2(3, 10); d1.swap(d2); for (int i = 0; i < d1.size(); i++) { cout << d1.at(i) << " "; } cout << endl; //deque插入和删除技术 deque<int> dInsert(5, 56); for (int i = 0; i < dInsert.size(); i++) { cout << dInsert.at(i) << " "; } cout << endl; dInsert.insert(dInsert.end(), 50); for (int i = 0; i < dInsert.size(); i++) { //cout << dInsert.at(i) << " "; cout << dInsert[i] << " "; } cout << endl; //erase操作 //注意：尽量少用erase(pos)和erase(beg,end) /* deque<int> dErase(3, 7); dErase.erase(dErase.end()); for (PITER p = dErase.begin(); p != dErase.end(); p++) { cout << *p << " "; } cout << endl; */ //clear操作 deque<int> dClear(3, 100); for (PITER p = dClear.begin(); p != dClear.end(); p++) { cout << *p << " "; } cout << endl; dClear.clear(); if (dClear.empty()) { cout << "empty it!" << endl; } //除此之外还有关系运算符 // == > >= < <=等等 操作省略 cin.get(); return 0; } |
