问题描述
限时送ChatGPT账号..所以它看起来像所有这些:http://www.cplusplus/reference/clibrary/ciso646/ 是 C++ 中的关键字.
So it looks like all these: http://www.cplusplus/reference/clibrary/ciso646/ are keywords in c++.
我的问题是.这是 C++ 标准的一部分吗?
My question is. Is this a part of the c++ standard?
我可以依靠它得到主要编译器的支持吗?我知道 gcc 确实支持这些关键字.
Can I rely on this to be supported by major compilers? I know gcc does support these keywords.
最后，也许这更像是一个偏好或风格问题，但与标准运算符(!、!=、&&...等)相比，使用关键字有什么优势吗?
Finally, perhaps this is more a preference or style question, but are there any advantages to using the keywords over the standard operators (!, !=, && ... etc)?
推荐答案
我的问题是.这是 C++ 标准的一部分吗?
My question is. Is this a part of the c++ standard?
是的.
我可以依靠它得到主要编译器的支持吗?
Can I rely on this to be supported by major compilers?
是的.但是MSVC默认不支持这个，你需要将选项 /permissive- 传递给它(或者，尽管这是错误且过时的，/Za)，禁用 Microsoft 语言扩展.无论如何，为几乎所有 C++ 项目启用此选项似乎是个好主意，但默认情况下它是关闭的.
Yes. But MSVC doesn’t support this by default, you need to pass it the option /permissive- (or, though this is buggy and outdated, /Za), which disables Microsoft language extensions. It seems a good idea to enable this option for almost all C++ projects anyway, it’s just a shame it’s off by default.
但是与标准运算符相比，使用关键字有什么优势吗
but are there any advantages to using the keywords over the standard operators
一般来说，没有.但是在 and、or、not 的情况下，许多(虽然可能不是大多数)人发现它更具可读性.我个人建议使用它们.
In general, no. But in the case of and, or, not, many (though probably not most) people find it more readable. Personally I recommend using them.
如果您绝对希望代码在没有 /permissive- 标志的情况下在 MSVC 上编译，#include <ciso646>(这是一个标准头，在符合C++ 实现，但为 MSVC 上的运算符添加了宏).
If you absolutely want the code to compile on MSVC without the /permissive- flag, #include <ciso646> (which is a standard header that’s empty on complying C++ implementations, but adds macros for the operators on MSVC).
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