std::experimental::erase_if (std::unordered_set)
来自 cppreference.com
< cpp | experimental
| 定义在头文件 <experimental/unordered_set> 中 |
||
| template< class Key, class Hash, class KeyEqual, class Alloc, class Pred > void erase_if( std::unordered_set<Key, Hash, KeyEqual, Alloc>& c, Pred pred ); |
(库基础 TS v2) | |
从容器中擦除所有满足谓词 pred 的元素。等效于
for (auto i = c.begin(), last = c.end(); i != last;) { if (pred(*i)) i = c.erase(i); else ++i; }
内容 |
[编辑] 参数
| c | - | 要从中擦除的容器 |
| pred | - | 确定要擦除哪些元素的谓词 |
[编辑] 复杂度
线性。
[编辑] 示例
运行此代码
#include <experimental/unordered_set> #include <iostream> template<typename Os, typename Container> inline Os& operator<<(Os& os, Container const& container) { os << "{ "; for (const auto& item : container) os << item << ' '; return os << '}'; } int main() { std::unordered_set<int> data{3, 3, 4, 5, 5, 6, 6, 7, 2, 1, 0}; std::cout << "Original:\n" << data << '\n'; auto divisible_by_3 = [](auto const& x) { return (x % 3) == 0; }; std::experimental::erase_if(data, divisible_by_3); std::cout << "Erase all items divisible by 3:\n" << data << '\n'; }
可能的输出
Original:
{ 0 1 2 7 6 5 4 3 }
Erase all items divisible by 3:
{ 1 2 7 5 4 }[编辑] 另请参阅
| 删除满足特定条件的元素 (函数模板) |
