reverse_iterator::operator+=

從 reverse_iterator 加入指定的位移。

reverse_iterator<RandomIterator>& operator+=(
   difference_type _Off
);

參數

• _Off
  用來遞增 Iterator 的位移。

傳回值

對 reverse_iterator處理的元素的參考。

範例

// reverse_iterator_op_addoff.cpp
// compile with: /EHsc
#include <iterator>
#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;

   // Initializing reverse_iterators to the last element
   vector <int>::reverse_iterator rVPOS1 = vec.rbegin ( );
   
   cout << "The iterator rVPOS1 initially points to the first "
        << "element\n in the reversed sequence: "
        << *rVPOS1 << "." << endl;

   rVPOS1+=2;   // addition of an offset
   cout << "After the +2 offset, the iterator rVPOS1 now points\n"
        << " to the third element in the reversed sequence: "
        << *rVPOS1 << "." << endl;
}

需求

標頭：<迭代器>

命名空間: std

請參閱

參考

reverse_iterator 類別

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