C++ 参考手册
- C++11
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- 容器库
- std::array
- std::vector
- std::map
- std::unordered_map
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::operator[]
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::get_allocator
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::begin, std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::cbegin
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::empty
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::end, std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::cend
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::unordered_map
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::~unordered_map
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::operator=
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::size
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::max_size
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::clear
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::insert
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::insert_or_assign
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::emplace
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::emplace_hint
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::try_emplace
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::erase
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::swap
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::extract
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::merge
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::at
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::count
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::find
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::contains
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::equal_range
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::begin(size_type), std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::cbegin(size_type)
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::end(size_type), std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::cend(size_type)
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::bucket_count
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::max_bucket_count
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::bucket_size
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::bucket
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::load_factor
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::max_load_factor
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::rehash
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::reserve
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::hash_function
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::key_eq
- operator==,!=(std::unordered_map)
- std::swap(std::unordered_map)
- std::erase_if (std::unordered_map)
- std::unordered_map 的推导指引
- std::priority_queue
- std::span
- std::forward_list
- std::deque
- std::list
- std::set
- std::multiset
- std::multimap
- std::unordered_set
- std::unordered_multiset
- std::unordered_multimap
- std::stack
- std::queue
- std::vector<bool>
- 结点把柄 (C++17)
- 注释
- 迭代器库
- 范围库 (C++20)
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- 实验性 C++ 特性
- 有用的资源
- 索引
- std 符号索引
- 协程支持 (C++20)
- C++ 关键词
位置：首页 > C++ 参考手册 >容器库 >std::unordered_map > std::erase_if (std::unordered_map)
std::erase_if (std::unordered_map)
| 定义于头文件 <unordered_map>
|
||
| template< class Key, class T, class Hash, class KeyEqual, class Alloc, class Pred > typename std::unordered_map<Key,T,Hash,KeyEqual,Alloc>::size_type |
(C++20 起) | |
从容器中擦除所有满足谓词 pred 的元素。等价于
auto old_size = c.size(); for (auto i = c.begin(), last = c.end(); i != last; ) { if (pred(*i)) { i = c.erase(i); } else { ++i; } } return old_size - c.size();
参数
| c | - | 要从中擦除的元素 |
| pred | - | 若应该擦除元素则对它返回 true 的谓词 |
复杂度
线性。
示例
| 本节未完成 原因：暂无示例 |
参阅
| 移除满足特定判别标准的元素 (函数模板) |