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Diffstat (limited to 'exercises/29_errdefer.zig')
-rw-r--r-- | exercises/29_errdefer.zig | 59 |
1 files changed, 0 insertions, 59 deletions
diff --git a/exercises/29_errdefer.zig b/exercises/29_errdefer.zig deleted file mode 100644 index f43c738..0000000 --- a/exercises/29_errdefer.zig +++ /dev/null @@ -1,59 +0,0 @@ -// -// Another common problem is a block of code that could exit in multiple -// places due to an error - but that needs to run do something before it -// exits (typically to clean up after itself). -// -// An "errdefer" is a defer that only runs if the block exits with an error: -// -// { -// errdefer cleanup(); -// try canFail(); -// } -// -// The cleanup() function is called ONLY if the "try" statement returns an -// error produced by canFail(). -// -const std = @import("std"); - -var counter: u32 = 0; - -const MyErr = error{ GetFail, IncFail }; - -pub fn main() void { - // We simply quit the entire program if we fail to get a number: - var a: u32 = makeNumber() catch return; - var b: u32 = makeNumber() catch return; - - std.debug.print("Numbers: {}, {}\n", .{ a, b }); -} - -fn makeNumber() MyErr!u32 { - std.debug.print("Getting number...", .{}); - - // Please make the "failed" message print ONLY if the makeNumber() - // function exits with an error: - std.debug.print("failed!\n", .{}); - - var num = try getNumber(); // <-- This could fail! - - num = try increaseNumber(num); // <-- This could ALSO fail! - - std.debug.print("got {}. ", .{num}); - - return num; -} - -fn getNumber() MyErr!u32 { - // I _could_ fail...but I don't! - return 4; -} - -fn increaseNumber(n: u32) MyErr!u32 { - // I fail after the first time you run me! - if (counter > 0) return MyErr.IncFail; - - // Sneaky, weird global stuff. - counter += 1; - - return n + 1; -} |