error C2338: You've instantiated std::aligned_storag

发布时间：2020-12-16 07:18:33 所属栏目：百科来源：网络整理

导读：? ? 报的完整错误为： error C2338: You‘ve instantiated std::aligned_storageLen,Align with an extended alignment (in other words,Align alignof(max_align_t)). Before VS 2017 15.8,the member type would non-conformingly have an alignment of on

报的完整错误为：

error C2338: You‘ve instantiated std::aligned_storage<Len,Align> with an extended alignment (in other words,Align > alignof(max_align_t)). 
Before VS 2017 15.8,the member type would non-conformingly have an alignment of only alignof(max_align_t). 
VS 2017 15.8 was fixed to handle this correctly,but the fix inherently changes layout and breaks binary compatibility (*only* for uses of 
aligned_storage with extended alignments). Please define either (1) _ENABLE_EXTENDED_ALIGNED_STORAGE to acknowledge that you understand this 
message and that you actually want a type with an extended alignment,or (2) _DISABLE_EXTENDED_ALIGNED_STORAGE to silence this message and 
get the old non-conformant behavior.

大概意思就是：VS2017 15.8版本修复了老版本有关对齐存储部分缺陷，但修复本身也有缺陷。如果不想编译时报这个问题，就在预编译时定义一个宏 _ENABLE_EXTENDED_ALIGNED_STORAGE 或者 _DISABLE_EXTENDED_ALIGNED_STORAGE（博主的理解是按照修复后的逻辑处理就定义带enable那个，按照老版本的逻辑处理就定义带disable那个）

参考解决方法：

打开项目属性页 -- > C/C++? --> Preprocessor -->?Preprocessor Definitions

里面添加，_DISABLE_EXTENDED_ALIGNED_STORAGE

即可。

参考文章

error C2338: You‘ve instantiated std::aligned_storage《Len,Align》 with an extended alignment.（讨论）

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error C2338: You&#39;ve instantiated std::aligned_storag

error C2338: You've instantiated std::aligned_storag