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added 092_interfaces to build

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This commit is contained in:
Chris Boesch 2023-02-11 11:43:09 +01:00
parent 9b38f3584b
commit 35c5d6b976
2 changed files with 13 additions and 32 deletions
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9
build.zig
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@ -460,6 +460,10 @@ const exercises = [_]Exercise{
// .output = "ABCDEF", // .output = "ABCDEF",
// .@"async" = true, // .@"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", .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.", .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{ const file_path = std.fs.path.join(b.allocator, &[_][]const u8{
if (use_healed) "patches/healed" else "exercises", ex.main_file, if (use_healed) "patches/healed" else "exercises", ex.main_file,
}) catch unreachable; }) catch unreachable;
const build_step = b.addExecutable(.{ const build_step = b.addExecutable(.{ .name = base_name, .root_source_file = .{ .path = file_path } });
.name = base_name,
.root_source_file = .{ .path = file_path }
});
build_step.install(); build_step.install();

36
exercises/092_interfaces.zig
View file

@ -1,20 +1,7 @@
// //
// Remeber excerice xx with tagged unions. That was a lot more better // Remeber excerices 55-57 with tagged unions.
// but it's can bee perfect.
// //
// With tagged unions, it gets EVEN BETTER! If you don't have a // (story/explanation from Dave)
// 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!
// //
const std = @import("std"); const std = @import("std");
@ -63,9 +50,14 @@ pub fn main() !void {
.grasshopper = Grasshopper{ .distance_hopped = 32 }, .grasshopper = Grasshopper{ .distance_hopped = 32 },
} }; } };
// The daily situation report, what's going on in the garden
try dailyReport(&my_insects); 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 { fn dailyReport(insectReport: []Insect) !void {
std.debug.print("Daily insect report:\n", .{}); std.debug.print("Daily insect report:\n", .{});
for (insectReport) |insect| { for (insectReport) |insect| {
@ -73,16 +65,4 @@ fn dailyReport(insectReport: []Insect) !void {
} }
} }
// Inferred enums are neat, representing the tip of the iceberg // Interfaces... (explanation from Dave)
// 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"!