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std::aligned_union

科技促进发展：：一致[医]联合

Defined in header ​​
template< std::size_t Len, class... Types > struct aligned_union;​(since C++11)

提供成员类型胡枝子f。type，它是一种大小和对齐方式的POD类型，适合用作对Types.仓库的大小至少是Len...std::aligned_union还确定了最严格的%28max%29对齐要求。Types，并将其作为常量使用。alignment_value...

如果sizeof...(Types) == 0，该行为是未定义的。

成员类型

NameDefinition
typethe POD type suitable for storage of any type from Types

帮助者类型

template< std::size_t Len, class... Types > using aligned_union_t = typename aligned_union::type;​(since C++14)

成员常数

alignment_value staticthe strictest alignment requirement of all Types (public static member constant)

可能的实施

#包括<algorithm>模板<std：：size[医]泰伦，同学们..。类型>结构对齐[医]UNION{StaticConexprSTD：：size[医]T对齐[医]值=std：：最大值%28{对齐%28类型%29}%29；结构类型{对齐%28对齐[医]价值%%29焦耳[医]斯STD：最大值%28{Len，大小%28类型%29...}%29；}；}；

*。

例

另见

alignment_of (C++11)obtains the type's alignment requirements (class template)
aligned_storage (C++11)defines the type suitable for use as uninitialized storage for types of given size (class template)

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http：//en.cppreference.com/w/cpp/type/aliing[医]联合

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