C#•6mo ago

C# enum deconstruction and assosiated data

hi, I want to follow the book crafting interpreters and I don't want to use the exact languadge he uses (java) to avoid copy pasting code without understanding it, I am looking at maybe using C# (I know... super far away from java), however I can't find a feature Ill prob want to use, is there a way to do rust style enum types with associated data? think something like (super super psudo code)

enum a{
twoDimantionalVector: (int, int)
position: (int, int, int)
cat: (string, string, int)
}
a value = ...
match a {
  case twoDimantionalVector(X, Y);
  case position(X, Y, Z) {...}
  case cat(name, color, age);
}

enum a{
twoDimantionalVector: (int, int)
position: (int, int, int)
cat: (string, string, int)
}
a value = ...
match a {
  case twoDimantionalVector(X, Y);
  case position(X, Y, Z) {...}
  case cat(name, color, age);
}

5 Replies

x0rld•6mo ago

create a custom class probably enum are limited in c#

potzko•6mo ago

I see, would I have to make the class with a slot for each and fill it with nulls where I don't have data? or how would I go about it

Thinker•6mo ago

You can sorta hack it

public abstract record A
{
    public sealed record TwoDimensionalVector(int X, int Y) : A;
    public sealed record Position(int X, int Y, int Z): A;
    public sealed record Cat(string Name, string Color, int Age) : A;
}

public abstract record A
{
    public sealed record TwoDimensionalVector(int X, int Y) : A;
    public sealed record Position(int X, int Y, int Z): A;
    public sealed record Cat(string Name, string Color, int Age) : A;
}

var value = a switch
{
    A.TwoDimensionalVector(var x, var y) => ...,
    A.Position(var x, var y, var z) => ...,
    A.Cat(var name, var color, var age) => ...,
};

var value = a switch
{
    A.TwoDimensionalVector(var x, var y) => ...,
    A.Position(var x, var y, var z) => ...,
    A.Cat(var name, var color, var age) => ...,
};

x0rld•6mo ago

there is a nuget package to have java like enum in c# let me find that https://github.com/ardalis/SmartEnum

potzko•6mo ago

That would work, ty 🙂

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C# enum deconstruction and assosiated data