zig/test/cases/enum_with_members.zig

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Zig

const assert = @import("std").debug.assert;
const mem = @import("std").mem;
const fmt = @import("std").fmt;
const ET = union(enum) {
SINT: i32,
UINT: u32,
pub fn print(a: &const ET, buf: []u8) error!usize {
return switch (*a) {
ET.SINT => |x| fmt.formatIntBuf(buf, x, 10, false, 0),
ET.UINT => |x| fmt.formatIntBuf(buf, x, 10, false, 0),
};
}
};
test "enum with members" {
const a = ET { .SINT = -42 };
const b = ET { .UINT = 42 };
var buf: [20]u8 = undefined;
assert((a.print(buf[0..]) catch unreachable) == 3);
assert(mem.eql(u8, buf[0..3], "-42"));
assert((b.print(buf[0..]) catch unreachable) == 2);
assert(mem.eql(u8, buf[0..2], "42"));
}