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test_while_null_capture.zig (854B) - Raw

      1 const expect = @import("std").testing.expect;
      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 expect(sum1 == 3);
     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 expect(sum2 == 3);
     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 expect(i == 3);
     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