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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 }