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std::unordered_set::begin(int)
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std::multiset::erase

STD：：Multiset：：擦除

​(1)​
void erase( iterator pos (until C++11)
iterator erase( const_iterator pos (since C++11)
iterator erase( iterator pos (since C++17)
​(2)​
void erase( iterator first, iterator last (until C++11)
iterator erase( const_iterator first, const_iterator last (since C++11)
size_type erase( const key_type& key (3)​

从容器中移除指定的元素。

1%29移除pos...

2%29移除范围内的元素。[first; last)中的有效范围。*this...

3%29移除所有键相等于key...

对擦除元素的引用和迭代器无效。其他引用和迭代器不受影响。

迭代器pos必须是有效的和可撤销的。因此end()迭代器%28有效，但不可取消引用%29不能用作pos...

参数

pos-iterator to the element to remove
first, last-range of elements to remove
key-key value of the elements to remove

返回值

1-2%，29，Iterator，在最后一次删除元素之后.

3%，29个元素被移除。

例外

1，2%29%28无29

3%29由Compare对象。

复杂性

给定实例c成multiset*

1%29摊销常数

2%29log(c.size())+std::distance(first, last)

3%29log(c.size()) + c.count(k)

例

二次

#include <set>
#include <iostream>
int main()
{
    std::multiset<int> c = {1, 2, 3, 4, 5, 6, 7, 8, 9};
    // erase all odd numbers from c
    for(auto it = c.begin( it != c.end( )
        if(*it % 2 == 1)
            it = c.erase(it
        else
            ++it;
    for(int n : c)
        std::cout << n << ' ';
}

二次

产出：

二次

2 4 6 8

二次

另见

clearclears the contents (public member function)

 © cppreference.com

在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/容器/multiset/擦除

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