zig

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test_tagged_union.zig (528B) - Raw

      1 const std = @import("std");
      2 const expect = std.testing.expect;
      3 
      4 const ComplexTypeTag = enum {
      5     ok,
      6     not_ok,
      7 };
      8 const ComplexType = union(ComplexTypeTag) {
      9     ok: u8,
     10     not_ok: void,
     11 };
     12 
     13 test "switch on tagged union" {
     14     const c = ComplexType{ .ok = 42 };
     15     try expect(@as(ComplexTypeTag, c) == ComplexTypeTag.ok);
     16 
     17     switch (c) {
     18         .ok => |value| try expect(value == 42),
     19         .not_ok => unreachable,
     20     }
     21 }
     22 
     23 test "get tag type" {
     24     try expect(std.meta.Tag(ComplexType) == ComplexTypeTag);
     25 }
     26 
     27 // test