C ++错误： 'class'没有命名类型“和“invalid use of incomplete type'struct ...'” [英] C++ Errors: " 'class' does not name a type" and "invalid use of incomplete type ‘struct ...' "

问题描述

这里是一个非常重复的问题，也在这里在StackOverflow，但我不设法解决我的问题，甚至尝试不同的答案。所以，我有一些类：

Here is a very repetitive issue, also here in StackOverflow, but I do not manage to solve my problem even trying the different answers. So, I have some classes:

main.cpp：

#include "foo.h"
#include "bar.h"

...

foo.h：

#include "bar.h"
class foo {
  foo();
  bar& bind(bar &b);
  gru& bind(gru &g);
};

bar.h：

#include "foo.h"
class bar {
  bar();
  foo& bind(foo &f);
  gru& bind(gru &g);
};

显然，我有一个循环依赖。所以我得到臭名昭着的错误'bar'没有命名一个类型。在这种情况下，我添加类栏; 到 foo 声明并删除 #include 。当我这样做，我得到：无效使用不完全类型'struct bar'。

Clearly, I have a cyclic dependency. So I get the infamous error 'bar' does not name a type. In this case, I add class bar; to foo declaration and delete the #include. When I do that, I get: invalid use of incomplete type ‘struct bar'.

不同的方式，还添加 class foo; 到bar，但我总是有某种错误。在这后一种情况下，我得到：

I tried in some different ways, also adding class foo; to bar, but I always have some kind of error. In this last case I get:

bar.cpp:48:11: error: prototype for ‘foo& bar::bind(bar::foo&)’ does not match any in class ‘bar’
bar.h:55:12: error: candidates are: gru& bar::bind(gru&)
bar.h:54:13: error:                 bar::foo& bar::bind(bar::foo&)

此外，我从来没有抱怨 gru 。作为一个额外的信息，作为一个附加的信息，已经在这个程序，与 bar 和 main 添加 foo 。

Plus, I never get any complain about gru. Which, as an additional information, was already there in this program, working perfectly along with bar and main, before I added foo.

任何有用的想法？非常感谢：）

Any helpful ideas? Thanks a lot :)

推荐答案

谢谢你们的答案。在很多方面，他们是有帮助的。

Thank you a lot guys for the answers. In many ways they were helpful.

最后，我意识到，我不得不重新排序所有 #include 在我的代码，因为，正如你可能已经意识到，有更多的编码，我在这里放在一个更简单的版本（对不起。）

In the end I realized that I had to reorder all the #include's in my code, because, as you may have realized, there were a lot more coding and what I put here was a simpler version (sorry for that).

，我的最终解决方案是在 foo.h 和中包括 class bar; 在 bar.h 中。然后重新排序 main.cpp 和Makefile中的include。

So, my final solution was to include class bar; in foo.h and class foo; in bar.h. Then reorder the includes in main.cpp and the Makefile.

再次感谢 - ）

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