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EnumBitSet

Fast and memory efficient implementation of C#'s ISet for enums, storing data as bit masks:

• EnumBitSet32<T>: uses EnumBitMask32<T> as data, supporting enums with up to 32 values.
• EnumBitSet64<T>: uses EnumBitMask64<T> as data, supporting enums with up to 64 values.

Bit masks are readonly structs implementing IReadOnlySet for enums:

• EnumBitMask32<T>: uses int as data, supporting enums with up to 32 values.
• EnumBitMask64<T>: uses long as data, supporting enums with up to 64 values.

All implementations support enums both with and without [Flags] attributes.

Conversions between enum values and integer types are non-boxing where possible by using unsafe utilities from Unity 2018+, .NET 5+ or .NET Core 3.0+

Installing the package

This package is available on the openupm registry and can be installed using the openupm-cli:

openupm add com.gilzoide.enum-bitset

Otherwise, you can install directly using the Unity Package Manager with the following URL:

https://github.com/gilzoide/unity-enum-bitset.git#1.1.0

Unity 2020+ Serialization and Property Drawer

In Unity 2020+, EnumBitSets are serializable directly as generic classes. There's also a custom property drawer for selecting the containing enums:

using System;
using UnityEngine;
using Gilzoide.EnumBitSet;

public enum TestEnum
{
    Zero, One, Two, Three
}

[Flags]
public enum TestEnumFlags
{
    Zero = 1 << 0, One = 1 << 1, Two = 1 << 2, Three = 1 << 3
}

public class ScriptWithBitSet : MonoBehaviour
{    
    public EnumBitSet32<TestEnum> aBitset;
    public EnumBitSet64<TestEnumFlags> anotherBitset;
}

Unity 2019- Serialization and Property Drawer

In Unity 2019 and earlier, create non-generic classes that inherit from the generic ones:

using System;
using UnityEngine;
using Gilzoide.EnumBitSet;

public enum TestEnum
{
    Zero, One, Two, Three
}

[Flags]
public enum TestEnumFlags
{
    Zero = 1 << 0, One = 1 << 1, Two = 1 << 2, Three = 1 << 3
}

[Serializable]
public class TestEnumBitSet32 : EnumBitSet32<TestEnum> {}

[Serializable]
public class TestEnumFlagsBitSet64 : EnumBitSet64<TestEnumFlags> {}

public class ScriptWithBitSet : MonoBehaviour
{
    public EnumBitSet32<TestEnum> aBitset;
    public EnumBitSet64<TestEnumFlags> anotherBitset;
}

For the custom Property Drawer, the same applies. Create a class that inherits from EnumBitSetPropertyDrawer:

using UnityEditor;
using Gilzoide.EnumBitSet.Editor;

[CustomPropertyDrawer(typeof(TestEnumBitSet32))]
public class TestEnumBitSet32PropertyDrawer : EnumBitSetPropertyDrawer {}