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hash_multimap::erase

注意事項注意事項

這個 API 已經過時。這個選項是 unordered_multimap Class

從指定的位置移除項目的範圍。hash_multimap 的或移除符合指定之索引鍵的項目。

iterator erase(
   iterator _Where
);
iterator erase(
   iterator _First,
   iterator _Last
);
size_type erase(
   const key_type& _Key
);

參數

  • _Where
    從 hash_multimap 要移除之項目的位置。

  • _First
    從 hash_multimap 移除的第一個項目的位置。

  • _Last
    在從 hash_multimap 移除的最後一個項目以外的位置。

  • _Key
    從 hash_multimap 要移除的項目索引鍵。

傳回值

在前兩個成員函式、雙向 Iterator 保持在所有項目外的第一個項目被移除或對 hash_multimap 結尾的指標,如果沒有此類項目存在則為。

針對第三 + 成成員函式,傳回從 hash_multimap 移除項目的數目。

備註

成員函式絕不會擲回例外狀況。

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

當編譯這個範例與 /Wp64 旗標或在一個獨立的平台時,編譯器警告 C4267 會產生。如需這項警告的詳細資訊,請參閱 編譯器警告 (層級 3) C4267

// hash_multimap_erase.cpp
// compile with: /EHsc
#include <hash_map>
#include <iostream>

int main()
{
    using namespace std;
    using namespace stdext;
    hash_multimap<int, int> hm1, hm2, hm3;
    hash_multimap<int, int> :: iterator pIter, Iter1, Iter2;
    int i;
    hash_multimap<int, int>::size_type n;
    typedef pair<int, int> Int_Pair;

    for (i = 1; i < 5; i++)
    {
        hm1.insert(Int_Pair (i, i) );
        hm2.insert(Int_Pair (i, i*i) );
        hm3.insert(Int_Pair (i, i-1) );
    }

    // The 1st member function removes an element at a given position
    Iter1 = ++hm1.begin();
    hm1.erase(Iter1);

    cout << "After the 2nd element is deleted, "
         << "the hash_multimap hm1 is:";
    for (pIter = hm1.begin(); pIter != hm1.end(); pIter++)
        cout << " " << pIter -> second;
    cout << "." << endl;

    // The 2nd member function removes elements
    // in the range [_First, _Last)
    Iter1 = ++hm2.begin();
    Iter2 = --hm2.end();
    hm2.erase(Iter1, Iter2);

    cout << "After the middle two elements are deleted, "
         << "the hash_multimap hm2 is:";
    for (pIter = hm2.begin(); pIter != hm2.end(); pIter++)
        cout << " " << pIter -> second;
    cout << "." << endl;

    // The 3rd member function removes elements with a given _Key
    hm3.insert(Int_Pair (2, 5));
    n = hm3.erase(2);

    cout << "After the element with a key of 2 is deleted,\n"
         << " the hash_multimap hm3 is:";
    for (pIter = hm3.begin(); pIter != hm3.end(); pIter++)
        cout << " " << pIter -> second;
    cout << "." << endl;

    // The 3rd member function returns the number of elements removed
    cout << "The number of elements removed from hm3 is: "
         << n << "." << endl;

    // The dereferenced iterator can also be used to specify a key
    Iter1 = ++hm3.begin();
    hm3.erase(Iter1);

    cout << "After another element with a key equal to that of the"
         << endl;
    cout  << " 2nd element is deleted, "
          << "the hash_multimap hm3 is:";
    for (pIter = hm3.begin(); pIter != hm3.end(); pIter++)
        cout << " " << pIter -> second;
    cout << "." << endl;
}
  
  
  
  
  

需求

標題: <hash_map>

命名空間: stdext

請參閱

參考

hash_multimap Class

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