diff options
| -rw-r--r-- | build.zig | 9 | ||||
| -rw-r--r-- | exercises/092_interfaces.zig | 36 |
2 files changed, 13 insertions, 32 deletions
@@ -461,6 +461,10 @@ const exercises = [_]Exercise{ // .@"async" = true, // }, .{ + .main_file = "092_interfaces.zig", + .output = "Daily insect report:\nAnt is alive.\nBee visited 17 flowers.\nGrasshopper hopped 32 m.", + }, + .{ .main_file = "999_the_end.zig", .output = "\nThis is the end for now!\nWe hope you had fun and were able to learn a lot, so visit us again when the next exercises are available.", }, @@ -564,10 +568,7 @@ pub fn build(b: *Builder) void { const file_path = std.fs.path.join(b.allocator, &[_][]const u8{ if (use_healed) "patches/healed" else "exercises", ex.main_file, }) catch unreachable; - const build_step = b.addExecutable(.{ - .name = base_name, - .root_source_file = .{ .path = file_path } - }); + const build_step = b.addExecutable(.{ .name = base_name, .root_source_file = .{ .path = file_path } }); build_step.install(); diff --git a/exercises/092_interfaces.zig b/exercises/092_interfaces.zig index f9f9dc3..45f9d8e 100644 --- a/exercises/092_interfaces.zig +++ b/exercises/092_interfaces.zig @@ -1,20 +1,7 @@ // -// Remeber excerice xx with tagged unions. That was a lot more better -// but it's can bee perfect. +// Remeber excerices 55-57 with tagged unions. // -// With tagged unions, it gets EVEN BETTER! If you don't have a -// need for a separate enum, you can define an inferred enum with -// your union all in one place. Just use the 'enum' keyword in -// place of the tag type: -// -// const Foo = union(enum) { -// small: u8, -// medium: u32, -// large: u64, -// }; -// -// Let's convert Insect. Doctor Zoraptera has already deleted the -// explicit InsectStat enum for you! +// (story/explanation from Dave) // const std = @import("std"); @@ -63,9 +50,14 @@ pub fn main() !void { .grasshopper = Grasshopper{ .distance_hopped = 32 }, } }; + // The daily situation report, what's going on in the garden try dailyReport(&my_insects); } +// Through the interface we can keep a list of various objects +// (in this case the insects of our garden) and even pass them +// to a function without having to know the specific properties +// of each or the object itself. This is really cool! fn dailyReport(insectReport: []Insect) !void { std.debug.print("Daily insect report:\n", .{}); for (insectReport) |insect| { @@ -73,16 +65,4 @@ fn dailyReport(insectReport: []Insect) !void { } } -// Inferred enums are neat, representing the tip of the iceberg -// in the relationship between enums and unions. You can actually -// coerce a union TO an enum (which gives you the active field -// from the union as an enum). What's even wilder is that you can -// coerce an enum to a union! But don't get too excited, that -// only works when the union type is one of those weird zero-bit -// types like void! -// -// Tagged unions, as with most ideas in computer science, have a -// long history going back to the 1960s. However, they're only -// recently becoming mainstream, particularly in system-level -// programming languages. You might have also seen them called -// "variants", "sum types", or even "enums"! +// Interfaces... (explanation from Dave) |