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RobustToolbox/Robust.Shared/Utility/FixedArray.cs
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using System;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
using JetBrains.Annotations;
#pragma warning disable 169
namespace Robust.Shared.Utility
{
/// <summary>
/// Fixed size array stack allocation helpers.
/// </summary>
/// <remarks>
/// <para>
/// This helper class can be used to work around the limitation that <c>stackalloc</c>
/// cannot be used with ref types.
/// </para>
/// <para>
/// To use, call it like so:
/// <code>
/// var span = FixedArray.Alloc32&lt;object&gt;(out _);
/// </code>
/// There is an <c>out</c> parameter that you should probably always discard (as shown in the example).
/// This is so that stack space is properly allocated in your stack frame.
/// </para>
/// <para>
/// Do NOT under ANY CIRCUMSTANCE return the span given up the stack in any way.
/// You will break the GC and stack and (worst of all) I will shed you.
/// </para>
/// <para>
/// This class cannot be used with variable size allocations.
/// Just allocate a we'll-never-need-more bound like 128 and slim it down.
/// </para>
/// </remarks>
[PublicAPI]
[SuppressMessage("ReSharper", "ArrangeObjectCreationWhenTypeNotEvident")]
internal static class FixedArray
{
public static Span<T> Alloc2<T>(out FixedArray2<T> discard)
{
discard = new();
return discard.AsSpan;
}
public static Span<T> Alloc4<T>(out FixedArray4<T> discard)
{
discard = new();
return discard.AsSpan;
}
public static Span<T> Alloc8<T>(out FixedArray8<T> discard)
{
discard = new();
return discard.AsSpan;
}
public static Span<T> Alloc16<T>(out FixedArray16<T> discard)
{
discard = new();
return discard.AsSpan;
}
public static Span<T> Alloc32<T>(out FixedArray32<T> discard)
{
discard = new();
return discard.AsSpan;
}
public static Span<T> Alloc64<T>(out FixedArray64<T> discard)
{
discard = new();
return discard.AsSpan;
}
public static Span<T> Alloc128<T>(out FixedArray128<T> discard)
{
discard = new();
return discard.AsSpan;
}
}
internal struct FixedArray2<T>
{
private T _00;
private T _01;
public Span<T> AsSpan => MemoryMarshal.CreateSpan(ref _00, 2);
}
internal struct FixedArray4<T>
{
private T _00;
private T _01;
private T _02;
private T _03;
public Span<T> AsSpan => MemoryMarshal.CreateSpan(ref _00, 4);
}
internal struct FixedArray8<T>
{
private T _00;
private T _01;
private T _02;
private T _03;
private T _04;
private T _05;
private T _06;
private T _07;
public Span<T> AsSpan => MemoryMarshal.CreateSpan(ref _00, 8);
}
internal struct FixedArray16<T>
{
private T _00;
private T _01;
private T _02;
private T _03;
private T _04;
private T _05;
private T _06;
private T _07;
private T _08;
private T _09;
private T _10;
private T _11;
private T _12;
private T _13;
private T _14;
private T _15;
public Span<T> AsSpan => MemoryMarshal.CreateSpan(ref _00, 16);
}
internal struct FixedArray32<T>
{
private T _00;
private T _01;
private T _02;
private T _03;
private T _04;
private T _05;
private T _06;
private T _07;
private T _08;
private T _09;
private T _10;
private T _11;
private T _12;
private T _13;
private T _14;
private T _15;
private T _16;
private T _17;
private T _18;
private T _19;
private T _20;
private T _21;
private T _22;
private T _23;
private T _24;
private T _25;
private T _26;
private T _27;
private T _28;
private T _29;
private T _30;
private T _31;
public Span<T> AsSpan => MemoryMarshal.CreateSpan(ref _00, 32);
}
internal struct FixedArray64<T>
{
private T _00;
private T _01;
private T _02;
private T _03;
private T _04;
private T _05;
private T _06;
private T _07;
private T _08;
private T _09;
private T _10;
private T _11;
private T _12;
private T _13;
private T _14;
private T _15;
private T _16;
private T _17;
private T _18;
private T _19;
private T _20;
private T _21;
private T _22;
private T _23;
private T _24;
private T _25;
private T _26;
private T _27;
private T _28;
private T _29;
private T _30;
private T _31;
private T _32;
private T _33;
private T _34;
private T _35;
private T _36;
private T _37;
private T _38;
private T _39;
private T _40;
private T _41;
private T _42;
private T _43;
private T _44;
private T _45;
private T _46;
private T _47;
private T _48;
private T _49;
private T _50;
private T _51;
private T _52;
private T _53;
private T _54;
private T _55;
private T _56;
private T _57;
private T _58;
private T _59;
private T _60;
private T _61;
private T _62;
private T _63;
public Span<T> AsSpan => MemoryMarshal.CreateSpan(ref _00, 64);
}
internal struct FixedArray128<T>
{
private T _00;
private T _01;
private T _02;
private T _03;
private T _04;
private T _05;
private T _06;
private T _07;
private T _08;
private T _09;
private T _10;
private T _11;
private T _12;
private T _13;
private T _14;
private T _15;
private T _16;
private T _17;
private T _18;
private T _19;
private T _20;
private T _21;
private T _22;
private T _23;
private T _24;
private T _25;
private T _26;
private T _27;
private T _28;
private T _29;
private T _30;
private T _31;
private T _32;
private T _33;
private T _34;
private T _35;
private T _36;
private T _37;
private T _38;
private T _39;
private T _40;
private T _41;
private T _42;
private T _43;
private T _44;
private T _45;
private T _46;
private T _47;
private T _48;
private T _49;
private T _50;
private T _51;
private T _52;
private T _53;
private T _54;
private T _55;
private T _56;
private T _57;
private T _58;
private T _59;
private T _60;
private T _61;
private T _62;
private T _63;
private T _64;
private T _65;
private T _66;
private T _67;
private T _68;
private T _69;
private T _70;
private T _71;
private T _72;
private T _73;
private T _74;
private T _75;
private T _76;
private T _77;
private T _78;
private T _79;
private T _80;
private T _81;
private T _82;
private T _83;
private T _84;
private T _85;
private T _86;
private T _87;
private T _88;
private T _89;
private T _90;
private T _91;
private T _92;
private T _93;
private T _94;
private T _95;
private T _96;
private T _97;
private T _98;
private T _99;
private T _100;
private T _101;
private T _102;
private T _103;
private T _104;
private T _105;
private T _106;
private T _107;
private T _108;
private T _109;
private T _110;
private T _111;
private T _112;
private T _113;
private T _114;
private T _115;
private T _116;
private T _117;
private T _118;
private T _119;
private T _120;
private T _121;
private T _122;
private T _123;
private T _124;
private T _125;
private T _126;
private T _127;
public Span<T> AsSpan => MemoryMarshal.CreateSpan(ref _00, 128);
}
}
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