什么是“接口"?MSVC 中的关键字? [英] What is the "interface" keyword in MSVC?

问题描述

我正在查看 Windows 8.1 SDK，在 UnknownBase.h 中看到类似

I'm looking through the Windows 8.1 SDK and in UnknownBase.h I'm seeing things like

typedef interface IUnknown IUnknown;

我以前从未见过这个 interface 关键字.请注意，这绝对是一个 .h 标头，由 cl.exe 处理.不是IDL文件，也不是midl.exe处理的.

I've never seen this interface keyword before. Note that this is very definitely a .h header, processed by cl.exe. It's not IDL file, and it's not processed by midl.exe.

我在网上找到了这个:http://msdn.microsoft.com/en-us/library/50h7kwtb.aspx

但是__interface和interface

有人能帮我介绍一下吗?

Can anyone clue me in here?

推荐答案

Microsoft 有一些特定于编译器的扩展，例如您链接的扩展，但 interface 不应该是本地 C++ 编译器特定的关键字，而是而是一个替代某些东西的定义(在 BaseTyps.h 中它曾经定义如下)

Microsoft has some compiler-specific extensions like the one you linked but interface shouldn't be a native C++ compiler-specific keyword but rather a define which substitutes something (in BaseTyps.h it used to be defined as follows)

# define interface  struct

链接在这里

如果您想验证这一点，请为此类定义执行 grep，您应该会找到类似的内容.

If you want to verify this do a grep for such a definition and you should find something similar.

参考:http://social.msdn.microsoft.com/forums/vstudio/en-US/06bf1dea-1d20-4ec3-b9a1-3d673d7fcd8d/what-is-the-interface-keyword-in-native-c

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