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Diffstat (limited to 'exercises/56_unions2.zig')
-rw-r--r-- | exercises/56_unions2.zig | 64 |
1 files changed, 0 insertions, 64 deletions
diff --git a/exercises/56_unions2.zig b/exercises/56_unions2.zig deleted file mode 100644 index e4294db..0000000 --- a/exercises/56_unions2.zig +++ /dev/null @@ -1,64 +0,0 @@ -// -// 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 } |