xcode 如何将 .mm 文件添加到项目中？
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How to add a .mm file into the project?
提问by user705414
I need to add a .mm file which contains both ObjectC and C++, I am wondering how to do it using XCode 4?
我需要添加一个包含 ObjectC 和 C++ 的 .mm 文件，我想知道如何使用 XCode 4 来做到这一点？
回答by Hyman
There are absolutely no issues in doing that, just add the .mmfle to the project and XCode will compile it as Objective-C++.
这样做绝对没有问题，只需将.mm文件添加到项目中，XCode 就会将其编译为 Objective-C++。
The only caveat is that the .hassociated with that ObjC++ code must not contain any C++ specific code or every file in which that header is included must be .mmtoo.
唯一需要注意的是，与该 ObjC++ 代码关联的.h不得包含任何 C++ 特定代码，或者包含该标头的每个文件也必须是.mm。
This because XCode will use different compiler according to the single file, so if a .mis found it will try to compile it as plain ObjC and not ObjC++. You can force to compile it with che ObjC++ compiler but I suggest you to follow the principle described or rename other files to .mmjust to avoid getting things complicated.
这是因为 XCode 将根据单个文件使用不同的编译器，因此如果找到.m它将尝试将其编译为普通 ObjC 而不是 ObjC++。您可以使用 che ObjC++ 编译器强制编译它，但我建议您遵循所描述的原则或将其他文件重命名为.mm以避免使事情变得复杂。
