| 1 | const expectEqual = @import("std").testing.expectEqual; |
| 2 | |
| 3 | test "while null capture" { |
| 4 | var sum1: u32 = 0; |
| 5 | numbers_left = 3; |
| 6 | while (eventuallyNullSequence()) |value| { |
| 7 | sum1 += value; |
| 8 | } |
| 9 | try expectEqual(3, sum1); |
| 10 | |
| 11 | // null capture with an else block |
| 12 | var sum2: u32 = 0; |
| 13 | numbers_left = 3; |
| 14 | while (eventuallyNullSequence()) |value| { |
| 15 | sum2 += value; |
| 16 | } else { |
| 17 | try expectEqual(3, sum2); |
| 18 | } |
| 19 | |
| 20 | // null capture with a continue expression |
| 21 | var i: u32 = 0; |
| 22 | var sum3: u32 = 0; |
| 23 | numbers_left = 3; |
| 24 | while (eventuallyNullSequence()) |value| : (i += 1) { |
| 25 | sum3 += value; |
| 26 | } |
| 27 | try expectEqual(3, i); |
| 28 | } |
| 29 | |
| 30 | var numbers_left: u32 = undefined; |
| 31 | fn eventuallyNullSequence() ?u32 { |
| 32 | return if (numbers_left == 0) null else blk: { |
| 33 | numbers_left -= 1; |
| 34 | break :blk numbers_left; |
| 35 | }; |
| 36 | } |
| 37 | |
| 38 | // test |