匿名联合只能有非静态数据成员GCC c ++

问题描述

我有一些C代码和使用GCC编译器。

I have some C code and using the GCC compiler.

代码在匿名联合中有一些嵌套类型：

The code has some nested types inside an anonymous union:

struct ab {
    int a;
    int b;
    union {
        int *c;
        int *d;
        struct f {
           int *c;
           int *d;
        };
        struct e {
            int *c;
            int *d;
        };
    };
};

我遇到此错误：

Error: 'struct ab::<anonymous union>::f' invalid; an anonymous union
can only have non-static data members.

有人可以进一步解释此错误发生的原因吗？

Can someone give further explanation why this error is happening?

推荐答案

当引用union成员时，它像一个struct成员。

When referencing the union member, it acts like a struct member. You have created an ambiguous situation for the compiler.

这是有关GCC规范的更多信息：

Here is more information on the GCC specifications: http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed-Fields

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