Meg's Code Collection

lib/zig/extras

1	const std = @import("std");
2	const string = []const u8;
3	const extras = @import("./lib.zig");
4
5	pub fn opslice(slice: anytype, index: usize) ?std.meta.Elem(@TypeOf(slice)) {
6	if (slice.len <= index) return null;
7	return slice[index];
8	}
9
10	test {
11	const array = [_]u8{ 0, 1, 2, 3, 4, 5 };
12	const slice: []const u8 = &array;
13
14	try std.testing.expect(opslice(slice, 0) == 0);
15	try std.testing.expect(opslice(slice, 1) == 1);
16	try std.testing.expect(opslice(slice, 2) == 2);
17	try std.testing.expect(opslice(slice, 3) == 3);
18	try std.testing.expect(opslice(slice, 4) == 4);
19	try std.testing.expect(opslice(slice, 5) == 5);
20	try std.testing.expect(opslice(slice, 6) == null);
21	}
22
23	test {
24	const array = [_]u8{ 0, 1, 2, 3, 4, 5 };
25	const slice = &array;
26
27	try std.testing.expect(opslice(slice, 0) == 0);
28	try std.testing.expect(opslice(slice, 1) == 1);
29	try std.testing.expect(opslice(slice, 2) == 2);
30	try std.testing.expect(opslice(slice, 3) == 3);
31	try std.testing.expect(opslice(slice, 4) == 4);
32	try std.testing.expect(opslice(slice, 5) == 5);
33	try std.testing.expect(opslice(slice, 6) == null);
34	}