如何声明的extern typedef结构？ [英] How to declare extern typedef struct?

问题描述

我有两个C文件，文件foo.c的功能和test_foo.c这考验的foo.c的功能。

I have two c files, foo.c with the functionality and test_foo.c which test the functions of foo.c.

是否有访问结构的typedef 办法BAR 我在test_foo.c foo.c的定义不使用头文件？到目前为止，我能够避免.h文件，使整个节目将包括foo.c.的谢谢你。

Is there a way to access the struct typedef BAR I defined in foo.c in test_foo.c without using a header file? So far, I was able to avoid a h file so that the whole program would consist of foo.c. Thanks.

foo.c   
typedef struct BAR_{...} bar;
BAR *bar_new(...) {..}

test_foo.c
extern BAR *bar_new(...)

错误：BAR

推荐答案

答案是，有一个，你应该使用头文件来代替。
您可以复制该结构的定义 typedef结构BAR _ {...}酒吧; 到 test_foo.c ，它将工作。但是，这会导致重复。
每一个解决方案，必须工作提供给编译器结构的 test_foo.c 的实施。
你也可以使用一个ADT，如果这适合你在这种情况下。

The answer is that there is one, and you should use an header file instead. You can copy the definition of the struct typedef struct BAR_{...} bar; into test_foo.c and it will work. But this causes duplication. Every solution that works must make the implementation of struct available to the compiler in test_foo.c. You may also use an ADT if this suits you in this case.

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