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Diffstat (limited to 'exercises/48_methods2.zig')
-rw-r--r-- | exercises/48_methods2.zig | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/exercises/48_methods2.zig b/exercises/48_methods2.zig deleted file mode 100644 index f97710d..0000000 --- a/exercises/48_methods2.zig +++ /dev/null @@ -1,71 +0,0 @@ -// -// Now that we've seen how methods work, let's see if we can help -// our elephants out a bit more with some Elephant methods. -// -const std = @import("std"); - -const Elephant = struct { - letter: u8, - tail: ?*Elephant = null, - visited: bool = false, - - // New Elephant methods! - pub fn getTail(self: *Elephant) *Elephant { - return self.tail.?; // Remember, this is means "orelse unreachable" - } - - pub fn hasTail(self: *Elephant) bool { - return (self.tail != null); - } - - pub fn visit(self: *Elephant) void { - self.visited = true; - } - - pub fn print(self: *Elephant) void { - // Prints elephant letter and [v]isited - var v: u8 = if (self.visited) 'v' else ' '; - std.debug.print("{u}{u} ", .{ self.letter, v }); - } -}; - -pub fn main() void { - var elephantA = Elephant{ .letter = 'A' }; - var elephantB = Elephant{ .letter = 'B' }; - var elephantC = Elephant{ .letter = 'C' }; - - // Link the elephants so that each tail "points" to the next. - elephantA.tail = &elephantB; - elephantB.tail = &elephantC; - - visitElephants(&elephantA); - - std.debug.print("\n", .{}); -} - -// This function visits all elephants once, starting with the -// first elephant and following the tails to the next elephant. -fn visitElephants(first_elephant: *Elephant) void { - var e = first_elephant; - - while (true) { - e.print(); - e.visit(); - - // Get the next elephant or stop. - if (e.hasTail()) { - e = e.???; // Which method do we want here? - } else { - break; - } - } -} - -// Bonus: Zig's enums can also have methods! Can you find -// one in the wild? If you can, mention it along with your -// name or alias in a comment below this one and make a -// pull request on GitHub for a piece of eternal Ziglings -// glory. The first five (5) PRs will be accepted! -// -// 1) drforester - I found one in the Zig source: -// https://github.com/ziglang/zig/blob/041212a41cfaf029dc3eb9740467b721c76f406c/src/Compilation.zig#L2495 |