本文共 2314 字，大约阅读时间需要 7 分钟。

本篇学习deque删除操作相关的函数

clear：清除内容

erase：擦除元素

pop_front：移除首元素

pop_back：移除末尾元素

shrink_to_fit：通过释放未使用的内存减少内存的使用

代码实现

#include 
   
    #include 
    
     #include 
     
      using namespace std;class Person3{public:    Person3(string name):        m_strName(name)    {    }    string m_strName;};void deleteElement(){    deque
      
        deque1;    string strName =  "《从军行(王昌龄)》青海长云暗雪山，孤城遥望玉门关。黄沙百战穿金甲，不破楼兰终不还！";    //int = [-2147483648, 2147483647]    const int count = 214748;//2147483648    double startTime1 = clock();//1计算开始    for(int i = 0; i < count; i++)//214748    {        deque1.emplace_back(strName);    }    double endTime1 = clock();//1时间结束    cout << "deque1.size=" << deque1.size() << " deque1.max_size=" << deque1.max_size() << endl;    deque1.clear();    cout << "for    1 run time is: " << (double)(endTime1 - startTime1) / CLOCKS_PER_SEC << "s" << endl;    cout << endl;    deque
       
         deque3;    for(int i = 0; i < 11; i++)//214748    {        deque3.emplace_back(i);    }    cout << "deque3.size=" << deque3.size() << " deque3.max_size=" << deque3.max_size() << endl;    for(auto &val: deque3)    {        cout << val << "\t";    }    cout << endl;    deque3.pop_back();//移除尾部元素    for(auto &val: deque3)    {        cout << val << "\t";    }    cout << endl;    deque3.pop_front();//移除首部元素    for(auto &val: deque3)    {        cout << val << "\t";    }    cout << endl;    deque3.erase(deque3.begin() + 1);//删除deque3的第2个位置的元素    for(auto &val: deque3)    {        cout << val << "\t";    }    cout << endl;    deque3.erase(deque3.begin() + 2, deque3.end() - 1);//删除deque3的第3个位置到倒数第2个位置的元素    for(auto &val: deque3)    {        cout << val << "\t";    }    cout << endl;    cout << "deque3.size = " << deque3.size() << endl;    deque3.shrink_to_fit();    cout << "deque3.size = " << deque3.size() << endl;    deque3.resize(10);    cout << "deque3.size = " << deque3.size() << endl;    deque3.shrink_to_fit();    cout << "deque3.size = " << deque3.size() << endl;    deque3.clear();    cout << "deque3.size = " << deque3.size() << endl;    cout << endl;}int main(){    deleteElement();    cout << endl;    cout << "Hello World!" << endl;    return 0;}
       
      
     
    
   

运行结果：

clear();//移除容器的所有数据

erase(beg,end);//删除[beg,end)区间的数据，返回下一个数据的位置。

erase(pos);//删除pos位置的数据，返回下一个数据的位置。

参考：

转载地址：http://efiub.baihongyu.com/