hash_multimap::lower_bound

注意事項
這個 API 已經過時。替代案例是 unordered_multimap 類別。

傳回 Iterator 以 hash_multimap 的第一個項目具有等於或大於指定之索引鍵的索引鍵。

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

參數

• _Key
  引數索引鍵與項目的排序鍵會比較搜尋字串 hash_multimap 的。

傳回值

處理一個項目位置在一 hash_multimap 的與索引鍵等於或大於引數金鑰，或是處理成功最後一個項目的位置。hash_multimap 的 iterator 或 const_iterator ，如果遊戲不為索引鍵中找到。

如果傳回值 lower_bound 給 const_iterator，無法修改 hash_multimap 物件。 如果 lower_bound 的傳回值指派給 iterator，可以修改 hash_multimap 物件。

備註

在 Visual C++ .NET 2003 中， <hash_map> 和 <hash_set> 標頭檔的成員不在 std 命名空間中，而是移至 stdext 命名空間。 如需詳細資訊，請參閱 stdext 命名空間。

範例

// hash_multimap_lower_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, 20 ) );
   hm1.insert ( Int_Pair ( 3, 30 ) );

   hm1_RcIter = hm1.lower_bound( 2 );
   cout << "The element of hash_multimap hm1 with a key of 2 is: "
        << hm1_RcIter -> second << "." << endl;

   hm1_RcIter = hm1.lower_bound( 3 );
   cout << "The first element of hash_multimap hm1 with a key of 3 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.end( );
   hm1_AcIter--;
   hm1_RcIter = hm1.lower_bound( hm1_AcIter -> first );
   cout << "The first element of hm1 with a key matching"
        << endl << " that of the last element is: "
        << hm1_RcIter -> second << "." << endl;

   // Note that the first element with a key equal to
   // the key of the last element is not the last element
   if ( hm1_RcIter == --hm1.end( ) )
      cout << "This is the last element of hash_multimap hm1."
           << endl;
   else
      cout << "This is not the last element of hash_multimap hm1."
           << endl;
}

需求

標頭檔: <hash_map>

**命名空間：**stdext

請參閱

參考

hash_multimap 類別

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