set::erase

从指定的位置移除元素或元素的大小设置或移除与指定的键的元素。

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

参数

• _Where
  从要移除的元素的位置设置。

• _First
  从中移除的第一个元素的位置设置。

• _Last
  在从中移除的最后一个元素外确定设置。

• _Key
  从要移除的元素的键设置。

返回值

对于前两个成员函数、指定保持在所有元素外的第一个元素中移除一双向迭代器或设置的末尾的指针的，如果不存在这样的元素。 为第三个成员函数，从集合中移除元素的数目。

备注

这将返回类型不符合C++标准。

备注

在某些情况下，此方法可能会引发 out_of_range 异常。

示例

当编译此示例与 /Wp64 标记或在64位平台时，警告的编译器C4267将生成。 有关此警告的更多信息，请参见 编译器警告（等级 3）C4267。

// set_erase.cpp
// compile with: /EHsc
#include <set>
#include <iostream>

int main()
{
    using namespace std;
    set<int> s1, s2, s3;
    set<int>::iterator pIter, Iter1, Iter2;
    int i;
    set<int>::size_type n;

    for (i = 1; i < 5; i++)
    {
        s1.insert(i);
        s2.insert(i * i);
        s3.insert(i - 1);
    }

    // The 1st member function removes an element at a given position
    Iter1 = ++s1.begin();
    s1.erase(Iter1);

    cout << "After the 2nd element is deleted, the set s1 is:";
    for (pIter = s1.begin(); pIter != s1.end(); pIter++)
        cout << " " << *pIter;
    cout << "." << endl;

    // The 2nd member function removes elements
    // in the range [_First, _Last)
    Iter1 = ++s2.begin();
    Iter2 = --s2.end();
    s2.erase(Iter1, Iter2);

    cout << "After the middle two elements are deleted, "
         << "the set s2 is:";
    for (pIter = s2.begin(); pIter != s2.end(); pIter++)
        cout << " " << *pIter;
    cout << "." << endl;

    // The 3rd member function removes elements with a given _Key
    n = s3.erase(2);

    cout << "After the element with a key of 2 is deleted, "
         << "the set s3 is:";
    for (pIter = s3.begin(); pIter != s3.end(); pIter++)
        cout << " " << *pIter;
    cout << "." << endl;

    // The 3rd member function returns the number of elements removed
    cout << "The number of elements removed from s3 is: "
         << n << "." << endl;

    // The iterator can also be used to specify a key
    Iter1 = ++s3.begin();
    s3.erase(Iter1);

    cout << "After another element (unique for set) with a key"
         << endl;
    cout << "equal to that of the 2nd element is deleted, "
         << "the set s3 is:";
    for (pIter = s3.begin(); pIter != s3.end(); pIter++)
        cout << " " << *pIter;
    cout << "." << endl;
}

要求

标头: <set>

命名空间: std

请参见

参考

set Class

标准模板库