Comments (5)
I've done similar in the past. For now, the way I decided to work around it is that I instead returned a different Action
delegate for each match case, then invoked the action returned.
Anonymized example:
union.Match<Action<Input>>(
case1 => input => input.Value1 = case1.Value,
case2 => input => input.Value2 = case2.Value,
case3 => input => input.Value3 = case3.Value
).Invoke(input);
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Looking at the generated code, it appears that it would work well enough. I noticed that a corresponding task version is not created. Although this is not a feature I am seeking currently, I believe it would make sense to implement for the sake of symmetry.
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Hi, thanks for creating this issue. I've run into this scenario myself, and I think it makes total sense to support it.
One alternative I can suggest in the meantime is create a Unit
struct and return that instead of void
for your match functions. It would look something like this:
public readonly record struct Unit;
[Union]
public partial record SomeUnion
{
public partial record Foo;
public partial record Bar;
}
SomeUnion union = new SomeUnion.Foo();
union.Match(
foo =>
{
Console.WriteLine("foo");
return new Unit();
},
bar =>
{
Console.WriteLine("bar");
return new Unit();
}
);
Definitely a little more verbose, but might unblock until the feature gets implemented :)
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Just pushed v1.4.0 which should address your use case, @TheJayMann! Let me know how it works for you :)
Thanks again for filing this issue!
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Totally agree. I'll spin that off into its own issue 👍
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Related Issues (20)
- Record struct union support HOT 8
- Anonymous union variants
- Match on a specific union value only
- Unwrap union types HOT 2
- Simplify instantiation of generic-bound union members HOT 1
- Idea: Friendly use of ToString() HOT 4
- Make common members accessible without matching HOT 4
- Allow matching with static functions
- Implicit conversions clash with required union properties HOT 1
- Separate Attributes into another project HOT 4
- Question: make it to work with asp net HOT 6
- Prefer `_ is _ _` pattern HOT 1
- Add Action with the type in the else of a MatchXYZ HOT 7
- Annotate Generated Code with GeneratedCodeAttribute
- Inner union compile with error `Cannot implicitly convert type 'X' to 'Y` HOT 6
- Async match support HOT 2
- Async Action Match
- Do not generate implicit conversions if argument is an interface
- Disable CS1591 in generated code
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