reverse_iterator::operator

返回对依据位置指定数目的 reverse_iterator 解决的元素的元素偏移量。

reference operator[](
   difference_type _Off
) const;

参数

• _Off
  从 reverse_iterator 地址的偏移量。

返回值

对组件偏移量的引用。

备注

运算符返回 *(*this + _Off)。

示例

// reverse_iterator_ret_ref.cpp
// compile with: /EHsc
#include <iterator>
#include <algorithm>
#include <vector>
#include <iostream>

int main( )
{
   using namespace std;
   int i;

   vector<int> vec;
   for (i = 1 ; i < 6 ; ++i )
   {
      vec.push_back ( 2 * i );
   }
   
   vector <int>::iterator vIter;
   cout << "The vector vec is: ( ";
   for ( vIter = vec.begin ( ) ; vIter != vec.end ( ); vIter++ )
      cout << *vIter << " ";
   cout << ")." << endl;

   vector <int>::reverse_iterator rvIter;
   cout << "The vector vec reversed is: ( ";
   for ( rvIter = vec.rbegin( ) ; rvIter != vec.rend( ); rvIter++)
      cout << *rvIter << " ";
   cout << ")." << endl;

   vector <int>::iterator pos;
   pos = find ( vec.begin ( ), vec.end ( ), 8 );
   reverse_iterator<vector<int>::iterator> rpos ( pos );

   // Declare a difference type for a parameter
   reverse_iterator<vector<int>::iterator>::difference_type diff = 2;

   cout << "The iterator pos points to: " << *pos << "." << endl;
   cout << "The iterator rpos points to: " << *rpos << "." << endl;

   // Declare a reference return type & use operator[]
   reverse_iterator<vector<int>::iterator>::reference refrpos = rpos [diff];
   cout << "The iterator rpos now points to: " << refrpos << "." << endl;   
}

要求

标头: <iterator>

命名空间: std

请参见

参考

reverse_iterator Class

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