| 1 | // With an inferred error set |
| 2 | pub fn add_inferred(comptime T: type, a: T, b: T) !T { |
| 3 | const ov = @addWithOverflow(a, b); |
| 4 | if (ov[1] != 0) return error.Overflow; |
| 5 | return ov[0]; |
| 6 | } |
| 7 | |
| 8 | // With an explicit error set |
| 9 | pub fn add_explicit(comptime T: type, a: T, b: T) Error!T { |
| 10 | const ov = @addWithOverflow(a, b); |
| 11 | if (ov[1] != 0) return error.Overflow; |
| 12 | return ov[0]; |
| 13 | } |
| 14 | |
| 15 | const Error = error{ |
| 16 | Overflow, |
| 17 | }; |
| 18 | |
| 19 | const std = @import("std"); |
| 20 | |
| 21 | test "inferred error set" { |
| 22 | if (add_inferred(u8, 255, 1)) |_| unreachable else |err| switch (err) { |
| 23 | error.Overflow => {}, // ok |
| 24 | } |
| 25 | } |
| 26 | |
| 27 | // test |