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deque是双端队列，在头部和尾部都可以添加或删除数据，下面我们来看它的一些基本使用情况，首先来学习创建和初始化操作。

deque的创建和初始化有多种方式 ，不仅可以直接初始化，还可以使用其他容器进行初始化，也可以使用assign进行设置固定容量和值，下面来看下具体的代码：

#include 
   
    #include 
    
     using namespace std;void createDequeInit(){    //1.创建空双端队列deque1    deque
     
       deque1;    cout << "deque1.isEmpty = " << deque1.empty() << " deque1.size = " << deque1.size() << " deque1.max_size = " << deque1.max_size()<< endl;    //2.创建deque2有2个元素，值为随机值    deque
      
        deque2(2);    cout << "deque2.isEmpty = " << deque2.empty() << " deque2.size = " << deque2.size() << " deque2.max_size = " << deque2.max_size()<< endl;    cout << "deque2的值为：" << endl;    for(auto &val: deque2)    {        cout << val << "\t";    }    cout << endl;    //3.创建deque3有3个元素，分别为11， 12， 13    deque
       
         deque3 = {11, 12, 13};    cout << "deque3.isEmpty = " << deque3.empty() << " deque3.size = " << deque3.size() << " deque3.max_size = " << deque3.max_size()<< endl;    cout << "deque3的值为：" << endl;    for(auto &val: deque3)    {        cout << val << "\t";    }    cout << endl;    //4.创建deque4,用deque3赋值    deque
        
          deque4 = deque3; //deque
         
           deque4(deque3);//这两种方法都可以 cout << "deque4.isEmpty = " << deque4.empty() << " deque4.size = " << deque4.size() << " deque4.max_size = " << deque4.max_size()<< endl; cout << "deque4的值为：" << endl; for(auto &val: deque4) { cout << val << "\t"; } cout << endl; //5.创建deque5用assign进行赋值 deque
          
            deque5; deque5.assign({14, 15, 16, 17}); cout << "deque5的值为：" << endl; for(auto &val: deque5) { cout << val << "\t"; } cout << endl; //6.创建deque6用deque4进行初始化 deque
           
             deque6(deque4.begin(), deque4.end()); cout << "deque6的值为：" << endl; for(auto &val: deque6) { cout << val << "\t"; } cout << endl; cout << "deque6.size = " << deque6.size() << " deque6.max_size = " << deque6.max_size() << endl; //7.创建deque7用assign设定容器大小和初始值 deque
            
              deque7; deque7.assign(5, 18);//deque7有5个元素，每个元素为18 cout << "deque7的值为：" << endl; for(auto &val: deque7) { cout << val << "\t"; } cout << endl; cout << "deque7.size = " << deque7.size() << " deque7.max_size = " << deque7.max_size() << endl;}int main(){ createDequeInit(); cout << endl; cout << "Hello World!" << endl; return 0;}
            
           
          
         
        
       
      
     
    
   

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