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本篇学习deque的元素访问和内容交换

at：访问指定的元素，同时进行越界检查

operator[]：访问指定的元素

front：访问第一个元素

back：访问最后一个元素

swap：交换内容

代码实现：

#include 
   
    #include 
    
     using namespace std;void getElement(){    deque
     
       deque1 = {11, 13, 16, 18, 19, 12};    for(int &val: deque1)    {        cout << val << "\t";    }    cout << endl;    cout << "deque1.front = " << deque1.front() << endl;    cout << "deque1.at(2) = " << deque1.at(2) << endl;    cout << "deque1[3] ==== " << deque1[3] << endl;    cout << "deque1.back == " << deque1.back() << endl;    cout << endl;    deque
      
        deque2;    deque
       
         deque3;    deque2.assign(3, 23);    deque3.assign({12,14,15,36,67});    for(int &val: deque2)    {        cout << val << "\t";    }    cout << endl;    for(int &val: deque3)    {        cout << val << "\t";    }    cout << endl;    cout << "deque2.size===" << deque2.size() << endl;    cout << "deque3.size===" << deque3.size() << endl;    auto it1 = deque2.begin();    auto it2 = deque3.begin();    int &ref1 = deque2.front();    int &ref2 = deque3.front();    cout << "*it1 = " << *it1 << " *it2 = " << *it2 << " ref1 = " << ref1 << " ref2 = " << ref2 << endl;    cout << "swap after======" << endl;    deque2.swap(deque3);    for(int c: deque2)    {        cout << c << "\t";    }    cout << endl;    for(int c: deque3)    {        cout << c << "\t";    }    cout << endl;    cout << "deque2.size===" << deque2.size() << endl;    cout << "deque3.size===" << deque3.size() << endl;    cout << "*it1 = " << *it1 << " *it2 = " << *it2 << " ref1 = " << ref1 << " ref2 = " << ref2 << endl;    cout << endl;}int main(){    getElement();    cout << endl;    cout << "Hello World!" << endl;    return 0;}
       
      
     
    
   

运行结果：

注意，交换后迭代器与引用保持与原来的元素关联，例如it1指向的元素还是23，ref1引用的元素还23。

参考：

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