hash_multimap::erase
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> 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
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