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std::destroy_n

STD：摧毁[医]n

Defined in header ​​
template< class ForwardIt, class Size > ForwardIt destroy_n( ForwardIt first, Size n (1)(since C++17)
template< class ExecutionPolicy, class ForwardIt, class Size > ForwardIt destroy_n( ExecutionPolicy&& policy, ForwardIt first, Size n (2)(since C++17)

1%29摧毁n对象范围内的对象，从first，好像

二次

for (; n > 0; (void) ++first, --n)
  std::destroy_at(std::addressof(*first)

二次

2%29与%281%29相同，但根据policy此重载不参与过载解决，除非std::is_execution_policy_v<std::decay_t<ExecutionPolicy>>是真的

参数

first-the beginning of the range of elements to destroy
n-the number of elements to destroy
policy-the execution policy to use. See execution policy for details.

类型要求

---。

-不通过有效的Forward实例进行增量、赋值、比较或间接转换，否则会引发异常。

返回值

已销毁的对象范围的结束%28i。e.std::next(first, n)29%。

复杂性

线性在n...

例外

带有名为ExecutionPolicy报告错误如下：

  • 如果执行作为算法一部分调用的函数，则引发异常ExecutionPolicy是其中之一标准政策，，，std::terminate叫做。对于任何其他人ExecutionPolicy，行为是由实现定义的。

  • 如果算法不能分配内存，std::bad_alloc被扔了。

可能的实施

模板<类向前，类大小>向前销毁[医]n%28前进第一，大小n%29{表示%28；n>0；%28void%29++first，--n%29 std：销毁[医]地址：：地址%28%2A第一%29%29；先返回；}

*。

例

另见

destroy (C++17)destroys a range of objects (function template)
destroy_at (C++17)destroys an object at a given address (function template)

 © cppreference.com

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

http：//en.cppreference.com/w/cpp/Memory/DECUTE[医]n

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