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authorDave Gauer <dave@ratfactor.com>2021-03-12 18:59:46 -0500
committerDave Gauer <dave@ratfactor.com>2021-03-12 18:59:46 -0500
commit0956f1839fcaaa273353148da9e157a8f9690d2f (patch)
treed6c90700131d5b28e898881f13e2a05612e4703f /exercises/56_unions2.zig
parent93eefe0f250bb76bfdd8e6bb784b6a9586517000 (diff)
"999 is enough for anybody" triple-zero padding (#18)
When I hit 999 exercises, I will finally have reached the ultimate state of soteriological release and no more exercises will be needed. The cycle will be complete. All that will be left is perfect quietude, freedom, and highest happiness.
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-//
-// It is really quite inconvenient having to manually keep track
-// of the active field in our union, isn't it?
-//
-// Thankfully, Zig also has "tagged unions", which allow us to
-// store an enum value within our union representing which field
-// is active.
-//
-// const FooTag = enum{ small, medium, large };
-//
-// const Foo = union(FooTag) {
-// small: u8,
-// medium: u32,
-// large: u64,
-// };
-//
-// Now we can use a switch directly on the union to act on the
-// active field:
-//
-// var f = Foo{ .small = 10 };
-//
-// switch (f) {
-// .small => |my_small| do_something(my_small),
-// .medium => |my_medium| do_something(my_medium),
-// .large => |my_large| do_something(my_large),
-// }
-//
-// Let's make our Insects use a tagged union (Doctor Zoraptera
-// approves).
-//
-const std = @import("std");
-
-const InsectStat = enum { flowers_visited, still_alive };
-
-const Insect = union(InsectStat) {
- flowers_visited: u16,
- still_alive: bool,
-};
-
-pub fn main() void {
- var ant = Insect{ .still_alive = true };
- var bee = Insect{ .flowers_visited = 16 };
-
- std.debug.print("Insect report! ", .{});
-
- // Could it really be as simple as just passing the union?
- printInsect(???);
- printInsect(???);
-
- std.debug.print("\n", .{});
-}
-
-fn printInsect(insect: Insect) void {
- switch (???) {
- .still_alive => |a| std.debug.print("Ant alive is: {}. ", .{a}),
- .flowers_visited => |f| std.debug.print("Bee visited {} flowers. ", .{f}),
- }
-}
-
-// By the way, did unions remind you of optional values and errors?
-// Optional values are basically "null unions" and errors use "error
-// union types". Now we can add our own unions to the mix to handle
-// whatever situations we might encounter:
-// union(Tag) { value: u32, toxic_ooze: void }