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rust-inspired option type

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This commit is contained in:
milan
2022-11-11 16:25:18 +01:00
parent aac37e5101
commit c4f63ce3be
2 changed files with 69 additions and 0 deletions
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66
Assets/Escape Room Engine/Engine/Scripts/Utilities/Option.cs Normal file
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using System;
namespace Escape_Room_Engine.Engine.Scripts.Utilities
{
/// <summary>
/// Optional type with a subset of the functionality of the one described in the Rust documentation at https://doc.rust-lang.org/std/option/enum.Option.html.
/// </summary>
public interface IOption<T>
{
public bool IsSome();
public bool IsNone();
public T Expect(string message);
public T Unwrap();
public T UnwrapOr(T def);
public T UnwrapOrElse(Func<T> f);
public IOption<T> And(IOption<T> other);
public IOption<T> Or(IOption<T> other);
public bool Contains(T value);
public T Match(Func<T, T> some, Func<T> none);
public void Match(Action<T> some, Action none);
public void Match(Action<T> some);
public void Match(Action none);
}
public class Some<T> : IOption<T>
{
private readonly T _value;
private Some(T value) => _value = value;
public bool IsSome() => true;
public bool IsNone() => false;
public T Expect(string message) => _value;
public T Unwrap() => _value;
public T UnwrapOr(T def) => _value;
public T UnwrapOrElse(Func<T> f) => _value;
public IOption<T> And(IOption<T> other) => other;
public IOption<T> Or(IOption<T> other) => this;
public bool Contains(T value) => _value.Equals(value);
public T Match(Func<T, T> some, Func<T> none) => some(_value);
public void Match(Action<T> some, Action none) => some(_value);
public void Match(Action<T> some) => some(_value);
public void Match(Action none) {}
public static IOption<T> Of(T value) => new Some<T>(value);
}
public class None<T> : IOption<T>
{
public bool IsSome() => false;
public bool IsNone() => true;
public T Expect(string message) => throw new Exception(message);
public T Unwrap() => throw new Exception("Tried to unwrap None.");
public T UnwrapOr(T def) => def;
public T UnwrapOrElse(Func<T> f) => f();
public IOption<T> And(IOption<T> other) => this;
public IOption<T> Or(IOption<T> other) => other;
public bool Contains(T value) => false;
public T Match(Func<T, T> some, Func<T> none) => none();
public void Match(Action<T> some, Action none) => none();
public void Match(Action<T> some) {}
public void Match(Action none) => none();
public static IOption<T> New() => new None<T>();
}
}

3
Assets/Escape Room Engine/Engine/Scripts/Utilities/Option.cs.meta Normal file
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fileFormatVersion: 2
guid: 2782bb7baf73403a9cd9fc8cbc8d09a3
timeCreated: 1668169918