deque::rbegin

返回迭代器处于已撤消的 deque 的第一个元素。

const_reverse_iterator rbegin( ) const; 
reverse_iterator rbegin( );

返回值

介绍在其反转的 deque 的第一个元素或满足针对一反向随机访问迭代器位于 unreversed deque 的最后一个元素。

备注

开始 正使用 deque，rbegin 使用的反转 deque。

如果返回值 rbegin 为 const_reverse_iterator，不能修改 deque 对象。 如果返回值 rbegin 为 reverse_iterator，可以修改 deque 对象。

rbegin 可用于通过 deque 向后循环访问。

示例

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

int main( ) 
{
   using namespace std;
   deque <int> c1;
   deque <int>::iterator c1_Iter;
   deque <int>::reverse_iterator c1_rIter;

   // If the following line had replaced the line above, an error 
   // would have resulted in the line modifying an element 
   // (commented below) because the iterator would have been const
   // deque <int>::const_reverse_iterator c1_rIter;
   
   c1.push_back( 10 );
   c1.push_back( 20 );
   c1.push_back( 30 );

   c1_rIter = c1.rbegin( );
   cout << "Last element in the deque is " << *c1_rIter << "." << endl;

   cout << "The deque contains the elements: ";
   for ( c1_Iter = c1.begin( ); c1_Iter != c1.end( ); c1_Iter++ )
      cout << *c1_Iter << " ";
   cout << "in that order.";
   cout << endl;

   // rbegin can be used to iterate through a deque in reverse order
   cout << "The reversed deque is: ";
   for ( c1_rIter = c1.rbegin( ); c1_rIter != c1.rend( ); c1_rIter++ )
      cout << *c1_rIter << " ";
   cout << endl;

   c1_rIter = c1.rbegin( );
   *c1_rIter = 40;  // This would have caused an error if a 
                    // const_reverse iterator had been declared as 
                    // noted above
   cout << "Last element in deque is now " << *c1_rIter << "." << endl;
}

要求

标头: <deque>

命名空间: std

请参见

参考

deque 类

deque::rbegin 和 deque::rend

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