66 lines
2.5 KiB
C#
66 lines
2.5 KiB
C#
using System;
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namespace EscapeRoomEngine.Engine.Runtime.Utilities
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{
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/// <summary>
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/// 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.
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/// </summary>
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public interface IOption<T>
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{
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public bool IsSome();
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public bool IsNone();
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public T Expect(string message);
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public T Unwrap();
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public T UnwrapOr(T def);
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public T UnwrapOrElse(Func<T> f);
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public IOption<T> And(IOption<T> other);
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public IOption<T> Or(IOption<T> other);
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public bool Contains(T value);
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public T Match(Func<T, T> some, Func<T> none);
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public void Match(Action<T> some, Action none);
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public void Match(Action<T> some);
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public void Match(Action none);
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}
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public class Some<T> : IOption<T>
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{
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private readonly T _value;
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private Some(T value) => _value = value;
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public bool IsSome() => true;
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public bool IsNone() => false;
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public T Expect(string message) => _value;
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public T Unwrap() => _value;
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public T UnwrapOr(T def) => _value;
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public T UnwrapOrElse(Func<T> f) => _value;
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public IOption<T> And(IOption<T> other) => other;
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public IOption<T> Or(IOption<T> other) => this;
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public bool Contains(T value) => _value.Equals(value);
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public T Match(Func<T, T> some, Func<T> none) => some(_value);
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public void Match(Action<T> some, Action none) => some(_value);
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public void Match(Action<T> some) => some(_value);
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public void Match(Action none) {}
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public static IOption<T> Of(T value) => new Some<T>(value);
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}
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public class None<T> : IOption<T>
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{
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public bool IsSome() => false;
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public bool IsNone() => true;
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public T Expect(string message) => throw new OptionException(message);
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public T Unwrap() => throw new OptionException("Tried to unwrap None.");
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public T UnwrapOr(T def) => def;
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public T UnwrapOrElse(Func<T> f) => f();
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public IOption<T> And(IOption<T> other) => this;
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public IOption<T> Or(IOption<T> other) => other;
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public bool Contains(T value) => false;
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public T Match(Func<T, T> some, Func<T> none) => none();
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public void Match(Action<T> some, Action none) => none();
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public void Match(Action<T> some) {}
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public void Match(Action none) => none();
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public static IOption<T> New() => new None<T>();
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}
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} |