1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
#include <cstdarg>
#include <cstdint>
#include <cstdlib>
#include <new>
struct Foo {
enum class Tag {
A,
};
struct A_Body {
float _0[20];
};
Tag tag;
union {
A_Body a;
};
static Foo A(const float (&a0)[20]) {
Foo result;
for (int i = 0; i < 20; i++) {
::new (&result.a._0[i]) (float)(a0[i]);
}
result.tag = Tag::A;
return result;
}
bool IsA() const {
return tag == Tag::A;
}
};
extern "C" {
void root(Foo a);
} // extern "C"