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test_optional_type.zig (368B) - Raw

      1 const expect = @import("std").testing.expect;
      2 
      3 test "optional type" {
      4     // Declare an optional and coerce from null:
      5     var foo: ?i32 = null;
      6 
      7     // Coerce from child type of an optional
      8     foo = 1234;
      9 
     10     // Use compile-time reflection to access the child type of the optional:
     11     try comptime expect(@typeInfo(@TypeOf(foo)).optional.child == i32);
     12 }
     13 
     14 // test