hash_multimap::upper_bound

说明说明

此 API 已过时。另一种方法是 unordered_multimap Class

返回迭代器到一 hash_multimap 的第一个元素使用比指定的键大的密钥。

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

参数

  • _Key
    参数键与一个元素的排序关键字进行比较从要搜索的 hash_multimap 的。

返回值

解决一个元素位置在一 hash_multimap 的关键比参数键大的 迭代器const_iterator 或解决成功最后一个元素的位置。hash_multimap,如果与未作为项中。

如果 upper_bound 的返回值赋给 const_iterator,不能修改 hash_multimap 对象。如果 upper_bound 的返回值赋给 迭代器,可以修改 hash_multimap 对象。

备注

在 Visual C++ .NET 2003 中,<hash_map><hash_set> 标头文件的成员中不再标准,命名空间,而是将 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 Class

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