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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 或 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> 和 <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