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std::array
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std::multiset::extract

STD：：Multiset：：提取

node_type extract( const_iterator position (1)(since C++17)
node_type extract( const key_type& x (2)(since C++17)

1%29取消链接包含position并返回节点手柄拥有它的人

2%29如果容器有一个密钥相当于x，将包含第一个此类元素的节点从容器中取消链接，并返回节点手柄它的主人。否则，返回一个空节点句柄。

在任何一种情况下，都不会复制或移动任何元素，只有容器节点的内部指针才会被重新指定%28重新平衡，如下所示erase()29%。

提取节点会使迭代器无效，从而使提取的元素无效。指针和对提取元素的引用仍然有效，但不能在元素被节点句柄拥有时使用：如果元素被插入到容器中，它们就会变得可用。

参数

position-a valid iterator into this container
x-a key to identify the node to be extracted

返回值

阿节点手柄它拥有提取的元素，或空节点句柄，以防在重载%282%29中找到该元素。

复杂性

1%29摊销常数

2%29 log%28a.大小%28%29%29

注记

从集合中提取出一个只移动的对象是唯一的方法。

二次

set<move_only_type> s;
s.emplace(...
move_only_type mot = move(s.extract(s.begin()).value()

二次

例

另见

merge (C++17)splices nodes from another container (public member function)
insertinserts elements or nodes (since C++17) (public member function)
eraseerases elements (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/Extracte

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