hash_multimap::upper_bound

迭代器返回到 hash_multimap 的第一个元素与大于指定的键大的密钥。

iterator upper_bound( 
   const Key& _Key 
); 
const_iterator upper_bound( 
   const Key& _Key 
) const;

参数

• _Key
  参数用键元素的排序关键字进行比较从搜索的 hash_multimap 的。

返回值

解决一个元素一位置。hash_multimap 键使用参数比大的密钥或 迭代器const_iterator 或最后一个元素成功解决的位置。hash_multimap，如果与对于找到键。

如果返回值 upper_bound 为 const_iterator，不能修改 hash_multimap 对象。 如果返回值 upper_bound 为 迭代器，可以修改 hash_multimap 对象。

备注

在Visual C++ .NET 2003中，成员<hash_map> 和 <hash_set> 头文件不再在std命名空间，而是已经进入了stdext命名空间。 有关更多信息，请参见 stdext 命名空间。

示例

// hash_multimap_upper_bound.cpp
// compile with: /EHsc
#include <hash_map>
#include <iostream>

int main( )
{
   using namespace std;
   using namespace stdext;
   hash_multimap <int, int> hm1;
   hash_multimap <int, int> :: const_iterator hm1_AcIter, hm1_RcIter;
   typedef pair <int, int> Int_Pair;

   hm1.insert ( Int_Pair ( 1, 10 ) );
   hm1.insert ( Int_Pair ( 2, 20 ) );
   hm1.insert ( Int_Pair ( 3, 30 ) );
   hm1.insert ( Int_Pair ( 3, 40 ) );

   hm1_RcIter = hm1.upper_bound( 1 );
   cout << "The 1st element of hash_multimap hm1 with "
        << "a key greater than 1 is: "
        << hm1_RcIter -> second << "." << endl;

   hm1_RcIter = hm1.upper_bound( 2 );
   cout << "The first element of hash_multimap hm1\n with a key "
        << " greater than 2 is: "
        << hm1_RcIter -> second << "." << endl;

   // If no match is found for the key, end( ) is returned
   hm1_RcIter = hm1.lower_bound( 4 );

   if ( hm1_RcIter == hm1.end( ) )
      cout << "The hash_multimap hm1 doesn't have an element "
           << "with a key of 4." << endl;
   else
      cout << "The element of hash_multimap hm1 with a key of 4 is: "
           << hm1_RcIter -> second << "." << endl;

   // The element at a specific ___location in the hash_multimap can be
   // found using a dereferenced iterator addressing the ___location
   hm1_AcIter = hm1.begin( );
   hm1_RcIter = hm1.upper_bound( hm1_AcIter -> first );
   cout << "The first element of hm1 with a key greater than"
        << endl << " that of the initial element of hm1 is: "
        << hm1_RcIter -> second << "." << endl;
}

要求

标头: <hash_map>

**命名空间：**stdext

请参见

参考

hash_multimap 类

标准模板库