60 lines
1.7 KiB
C#
60 lines
1.7 KiB
C#
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using GamecraftModdingAPI.Blocks;
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using Svelto.DataStructures;
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using Svelto.ECS;
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namespace GamecraftModdingAPI
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{
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public struct OptionalRef<T> where T : unmanaged
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{
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private bool exists;
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private NB<T> array;
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private uint index;
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public OptionalRef(NB<T> array, uint index)
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{
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exists = true;
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this.array = array;
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this.index = index;
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}
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public OptionalRef(ref T value)
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{
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exists = true;
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array = default;
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index = default;
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}
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public ref T Get(T def = default)
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{
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if (exists)
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return ref array[index];
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return ref CompRefCache<T>._default;
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}
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public bool Exists => exists;
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public static implicit operator T(OptionalRef<T> opt) => opt.Get();
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public static implicit operator bool(OptionalRef<T> opt) => opt.exists;
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/*public delegate ref TR Mapper<TR>(ref T component) where TR : unmanaged;
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public unsafe delegate TR* PMapper<TR>(T* component) where TR : unmanaged;
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public unsafe OptionalRef<TR> Map<TR>(PMapper<TR> mapper) where TR : unmanaged =>
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exists ? new OptionalRef<TR>(ref *mapper(pointer)) : new OptionalRef<TR>();*/
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/// <summary>
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/// Creates an instance of a struct T that can be referenced.
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/// </summary>
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/// <typeparam name="T">The struct type to cache</typeparam>
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private struct CompRefCache<T> where T : unmanaged
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{
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public static T _default;
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}
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}
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}
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