hash_multimap::find

注意事項
這個 API 已經過時。這個選項是 unordered_multimap Class。

傳回位址的 Iterator 項目的第一個位置中有索引鍵等於指定的索引鍵 hash_multimap 的。

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

參數

• _Key
  項目的排序鍵將符合索引鍵的元素從搜尋依據的 hash_multimap 的。

傳回值

Iterator 處理一個項目的第一個位置與的指定索引鍵或成功最後一個項目位置 hash_multimap，如果符合沒有為索引鍵中找到。

備註

解決 hash_multimap 的項目排序鍵是 equivalent 引數索引鍵在一個二進位述詞下比可比性關聯性會根據的順序較少的成員函式傳回 Iterator。

如果的傳回值指派給 const_iteratorfind ，無法修改 hash_multimap 物件。如果傳回值 find 指派給 iterator，可以修改 hash_multimap 物件。

在 Visual C++ .NET Pocket PC， <hash_map> 和 <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_multimap_find.cpp
// compile with: /EHsc
#include <iostream>
#include <hash_map>

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

    hm1_RcIter = hm1.find(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.find(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.find(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

標題: <hash_map>

命名空間: stdext

請參閱

參考

hash_multimap Class

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