How to define struct and controled by macro

Help
1

Hi, In c/c++, I can define struct like this:

struct A
{
    int a;
#if _WIN64
    int b;
#endif
};

But how to do this in zig?

2

Your solution idea is in std library sources.

For instance:

and welcome to ziggit.

3

Welcome. I think the best way to achieve that is to change the field type to void when not windows. So something like this

const A = struct {
    a: i32,
    b: switch (@import("builtin").os.tag) {
        .windows => i32,
        else => void,
    },
};

another way to handle that at a higher level

const A = if (@import("builtin").os.tag == .windows)
    struct {
        a: i32,
        b: i32,
    }
else
    struct {
        a: i32,
    };
2 Likes
4

Thank you! use void could reduce duplicate.

5

Thank your reply! :grinning: