exercises/078_sentinels3.zig


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

//
// We were able to get a printable string out of a many-item
// pointer by using a slice to assert a specific length.
//
// But can we ever GO BACK to a sentinel-terminated pointer
// after we've "lost" the sentinel in a coercion?
//
// Yes, we can. Zig's @ptrCast() builtin can do this. Check out
// the signature:
//
//     @ptrCast(comptime DestType: type, value: anytype) DestType
//
// See if you can use it to solve the same many-item pointer
// problem, but without needing a length!
//
const print = @import("std").debug.print;

pub fn main() void {
    // Again, we've coerced the sentinel-terminated string to a
    // many-item pointer, which has no length or sentinel.
    const data: [*]const u8 = "Weird Data!";

    // Please cast 'data' to 'printable':
    const printable: [*:0]const u8 = ???;

    print("{s}\n", .{printable});
}