C++ 错误 C2039：“memchr”：不是“全局命名空间”的成员
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error C2039: 'memchr' : is not a member of '`global namespace''
提问by Autodidact
It has been quite a while since I am getting this error in the standard <cstring> header file for no apparent reason. A google search brought up many answers but none of them worked.
自从我无缘无故地在标准 <cstring> 头文件中收到此错误以来，已经有一段时间了。谷歌搜索带来了许多答案，但没有一个奏效。
回答by Autodidact
Ok I fixed it myself. It was a stupid mistake! I have a file called "String.h" in a library project which is being picked up by the <cstring> header. Probably because I have added the path to <String.h> as an additional include directory in my test project (where I am getting this error.) Hope this helps someone.
好的，我自己修好了。这是一个愚蠢的错误！我在一个库项目中有一个名为“String.h”的文件，该文件由 <cstring> 标头获取。可能是因为我已经将 <String.h> 的路径添加为我的测试项目中的附加包含目录（我在那里收到此错误。）希望这对某人有所帮助。
回答by Autodidact
Your compiler may be (correctly) placing the memchr function in the C++ std namespace. Try prefixing memchr call with std:: and if that fails, post the code that causes the problem.
您的编译器可能（正确）将 memchr 函数放置在 C++ std 命名空间中。尝试使用 std:: 为 memchr 调用添加前缀，如果失败，请发布导致问题的代码。
回答by Autodidact
Preprocessor defines are pretty handy when you want to avoid this sort of mistake.
当您想避免此类错误时，预处理器定义非常方便。
//whatev.h
#ifndef WHATEV
#define WHATEV
// your code here
#endif
