deque::const_reference

提供对 const 元素的类型在读取和执行的 const 操作过程、向量、双端队列存储状态。

typedef typename Allocator::const_reference const_reference;

备注

类型 const_reference 不能用于修改元素的值。

示例

// deque_const_ref.cpp
// compile with: /EHsc
#include <deque>
#include <iostream>

int main( ) 
{
   using namespace std;
   deque <int> c1;
   
   c1.push_back( 10 );
   c1.push_back( 20 );

   const deque <int> c2 = c1;
   const int &i = c2.front( );
   const int &j = c2.back( );
   cout << "The first element is " << i << endl;
   cout << "The second element is " << j << endl;
   
   // The following line would cause an error as c2 is const
   // c2.push_back( 30 );
}
  

要求

标头: <deque>

命名空间: std

请参见

参考

deque Class

标准模板库