两个文件在 c++ 中相互包含问题
我正在为一个开源库做出一些贡献，但我在修改其他人的代码时遇到了麻烦。以前，该库有一个名为 IntervalT.h 的文件和一个名为 Curves.h 的文件，其实现位于文件 Curves.tcc 中，并且 <由于某种原因，code>Interval.h 包含 Curves.h。现在我需要在 Curves.h 中使用 IntervalT.h，但是当我尝试使用 IntervalT 中定义的类时code>IntervalT.h，编译器给我错误（我已经在 Curves.h 文件的开头包含了 IntervalT.h）：
../../../inc/CORE/poly/Curves.h:1337:3: error: ‘IntervalT’ does not name a type
我的问题是：因为我从来没有以前有过这样的经历，“没有命名类型”错误是否与c++头文件的相互包含有关？或者是其他错误导致了这个错误？如果是这样，我应该如何编写程序让 Curves.h 看到 IntervalT.h？
顺便说一句，这段代码的组织方式非常奇怪。 Curves.tcc实际上包含在Curves.h中，这与我们通常的做法相反。这样做有什么特别的理由吗？或者说这其实并不重要？ .tcc 扩展名到底是什么？
I'm doing some contribution to an open source library, but I'm having trouble modifying other people's code. Previously the library had a file called IntervalT.h and a file called Curves.h with the implementation in the file Curves.tcc, and Interval.h includes Curves.h for some reason. Right now I need to use IntervalT.h in Curves.h, but when I tried to use the class IntervalT<NT> defined in IntervalT.h, the compiler gives me error (I've already included IntervalT.h in the beginning of Curves.h file):
../../../inc/CORE/poly/Curves.h:1337:3: error: ‘IntervalT’ does not name a type
My question is: Since I never have had such experience before, is "does not name a type" error related to mutual inclusion of c++ header files? Or it is other mistakes that cause this error? If so, how should I write my program to let the Curves.h sees IntervalT.h?
By the way, this piece of code was organized in a very weird way. Curves.tcc is actually included by Curves.h, which is the reverse way of we usually do. Is there a particular reason to do this? Or it doesn't really matter? And what is .tcc extension after all?
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我只能猜测（因为你可以随意命名你的文件），但是
.tcc扩展名是.cc扩展名的修改（这只是 C++ 代码）但t代表template。Curves.h包含Curves.tcc这一事实证实了这一点，这是一种将接口与模板实现分离的常用技术，同时仍然不会扰乱编译器，期望模板化代码的声明和定义都在同一个文件中（否则会出现错误）。 查看此答案以获得更好的想法。没有命名类型可能是因为IntervalT是一个模板，而您没有提供模板参数（或者可能是一个不同的错误，我没有尝试过）它），或者即使该文件名为IntervalT.h，但它不包含名为IntervalT的类，或者它位于不同的命名空间中。在我们做出更好的诊断之前，您必须提供更多信息。I can only guess (because you can name your files whatever you want), but the
.tccextension is a modification of the.ccextension (which is just C++ code) but thetstands fortemplate. This is confirmed by the fact thatCurves.hincludesCurves.tccwhich is a common technique for separating the interface from the implementation of a template while still not upsetting the compiler which expects both declaration and definition of templated code in the same file (or you get an error). See this answer to get a better idea.The
does not name a typecould be thatIntervalTis a template and you're not providing a template parameter (or that could be a different error, I haven't tried it), or that even though the file is calledIntervalT.hit does not contain a class calledIntervalT, or that it's in a different namespace. You'll have to give more info before we can make a better diagnosis.