hash_map::upper_bound

注意事項注意事項

這個 API 已經過時。這個選項是 unordered_map Class

傳回 Iterator 置於該索引鍵值大於特定索引鍵 hash_map 的第一個項目。

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

參數

  • _Key
    引數索引鍵值與項目比較的排序鍵值從被搜尋的 hash_map 的。

傳回值

處理一個項目位置 hash_map 與索引鍵比引數索引鍵的 iterator 大於或 const_iterator 或解決成功最後一個項目位置, hash_map If-Match 沒有為索引鍵中找到。

如果的傳回值指派給 const_iterator,無法修改 hash_map 物件。如果的傳回值指派給 iterator,可以修改 hash_map 物件。

備註

在 Visual C++ .NET Pocket PC, <hash_map><hash_set> 標頭檔 (Header File) 的成員不在 std 命名空間,,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_map_upper_bound.cpp
// compile with: /EHsc
#include <hash_map>
#include <iostream>

int main( )
{
   using namespace std;
   using namespace stdext;
   hash_map <int, int> hm1;
   hash_map <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_RcIter = hm1.upper_bound( 2 );
   cout << "The first element of hash_map hm1 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. upper_bound ( 4 );

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

   // The element at a specific location in the hash_map can be found 
   // using a dereferenced iterator addressing the location
   hm1_AcIter = hm1.begin( );
   hm1_RcIter = hm1. upper_bound ( hm1_AcIter -> first );
   cout << "The 1st element of hm1 with a key greater than "
        << "that\n of the initial element of hm1 is: "
        << hm1_RcIter -> second << "." << endl;
}
  
  
  

需求

標題: <hash_map>

命名空間: stdext

請參閱

參考

hash_map Class

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