operator<= (<iterator>)

測試運算子左邊的迭代器物件是否小於或等於右邊的迭代器物件。

template<class RandomIterator> 
   bool operator<=( 
      const reverse_iterator<RandomIterator>& _Left, 
      const reverse_iterator<RandomIterator>& _Right 
   );

參數

• _Left
  型別的物件。

• _Right
  型別的物件。

傳回值

true ，如果在運算式的左側的 Iterator 小於或等於 Iterator 在運算式右邊; false ，如果大於右邊的 Iterator。

備註

一個 Iterator 物件小於或等於另一個，則處理相同項目或在容器比另一個 Iterator 物件單元位址之前的項目。 一個 Iterator 物件大於時，如果它解決容器比另一個 Iterator 物件單元位址之後產生的項目。

範例

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

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

   vector<int> vec;
   for (i = 0 ; i < 6 ; ++i )  {
      vec.push_back ( 2 * i );
      }
   
   vector <int>::iterator vIter;

   cout << "The initial vector vec is: ( ";
   for ( vIter = vec.begin( ) ; vIter != vec.end( ); vIter++)
      cout << *vIter << " ";
   cout << ")." << endl;

   vector <int>::reverse_iterator rVPOS1 = vec.rbegin ( ) + 1, 
           rVPOS2 = vec.rbegin ( );
   
   cout << "The iterator rVPOS1 initially points to the "
           << "second element\n in the reversed sequence: "
           << *rVPOS1 << "." << endl;

   cout << "The iterator rVPOS2 initially points to the "
           << "first element\n in the reversed sequence: "
           << *rVPOS2 << "." << endl;

   if ( rVPOS1 <= rVPOS2 )
      cout << "The iterator rVPOS1 is less than or "
              << "equal to the iterator rVPOS2." << endl;
   else
      cout << "The iterator rVPOS1 is greater than "
              << "the iterator rVPOS2." << endl;

   rVPOS2++;
   cout << "The iterator rVPOS2 now points to the second "
           << "element\n in the reversed sequence: "
           << *rVPOS2 << "." << endl;

   if ( rVPOS1 <= rVPOS2 )
      cout << "The iterator rVPOS1 is less than or "
              << "equal to the iterator rVPOS2." << endl;
   else
      cout << "The iterator rVPOS1 is greater than "
              << "the iterator rVPOS2." << endl;
}

需求

標頭：<迭代器>

命名空間: std

請參閱

參考

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