operator<= (<iterator>)

如果在运算符左侧的迭代器对象小于或等于右侧，的迭代器对象测试。

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

参数

• _Left
  类型迭代器对象。

• _Right
  类型迭代器对象。

返回值

true，如果表达式左侧的迭代器小于或等于迭代器在表达式的右侧; false，如果它比右侧的迭代器大。

备注

一个迭代对象小于或等于另一个之中，则该解决同一元素或在容器大于另一个迭代器对象格地址的前的元素。 一个迭代对象与另一个大于，则解决在容器大于另一个迭代器对象格地址的后面的元素。

示例

// 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;
}

要求

标头: <iterator>

命名空间: std

请参见

参考

标准模板库