C/C++标准中定义的struct with flexible array memeber的用法在哪里？

Question

如果我有这样的代码

struct s { int x; char b[]; };

int main() {
    struct s s[10];
}

然后我用“gcc -O2 -W -Wall -pedantic”编译然后我得到：

<source>:4:14: warning: invalid use of structure with flexible array member [-Wpedantic]
    4 |     struct s s[10];
      |              ^

gcc 是完全正确的。具有灵活数组成员的结构不能那样工作。

C/C++ 标准中的什么地方定义了这个？

Answer 1

在 C 中，它是 §6.7.2.1，第 3 段：

A structure or union shall not contain a member with incomplete or function type,… except that the last member of a structure with more than one named member may have incomplete array type; such a structure (and any union containing, possibly recursively, a member that is such a structure) shall not be a member of a structure or an element of an array.

与@phuclv points out in a 一样，C++没有这个特性。

C/C++标准中定义的struct with flexible array memeber的用法在哪里？

Where is the usage of struct with flexible array memeber defined in the C/C++ standards?

c

c++

language-lawyer