EnumHasFlagSample.cs

using System;
using System.Diagnostics;
using UnityEngine;

/// <summary>
/// ビットフラグの速度チェックテストコード（Unity2020.3.11f）
/// </summary>
public class EnumFlagCheck : MonoBehaviour
{
    [Flags]
    private enum Flag
    {
        None = 0,

        A = 1 << 0,
        B = 1 << 1,
        C = 1 << 2,
        D = 1 << 3,
        E = 1 << 4,
    }

    private Flag flag = Flag.None;
    private int flagInt = 0;

    private void Start()
    {
        Initialize();

        for (int i = 0; i < 3; i++)
        {
            Sample();
        }
    }

    private void Initialize()
    {
        // 適当にフラグをセット
        Flag[] list = new Flag[] { Flag.A, Flag.B, Flag.C, Flag.D, Flag.E };
        for (int i = 0; i < 100; i++)
        {
            int index = UnityEngine.Random.Range(0, list.Length);
            bool isOn = UnityEngine.Random.Range(0, 2) == 1;
            SetFlag(list[index], isOn);
        }
    }

    private void Sample()
    {
        int count = 10000000; //1千万ループ

        Stopwatch sw = new Stopwatch();

        // HasFlag
        sw.Start();
        for (int i = 0; i < count; i++)
        {
            bool val = GetFlag(Flag.D);
        }
        sw.Stop();
        UnityEngine.Debug.Log(" HasFlag : " + sw.ElapsedMilliseconds);

        sw.Reset();

        // Int
        sw.Start();
        for (int i = 0; i < count; i++)
        {
            bool val = GetFlagInt(Flag.D);
        }
        sw.Stop();
        UnityEngine.Debug.Log(" FlagInt : " + sw.ElapsedMilliseconds);
    }

    private void SetFlag(Flag f, bool isOn)
    {
        if (isOn)
        {
            flag |= f;
            flagInt |= (int)f;
        }
        else
        {
            flag &= ~f;
            flagInt &= (int)~f;
        }
    }

    private bool GetFlag(Flag f)
    {
        return flag.HasFlag(f);
    }

    private bool GetFlagInt(Flag f)
    {
        return (flagInt & (int)f) != 0;
    }
}

/*
 * 計３ループ
 * ●１回目
 * 　GetFlag    : 1744ms
 * 　GetFlagInt : 5ms
 *
 * ●２回目
 * 　GetFlag    : 1708ms
 * 　GetFlagInt : 5ms
 * 　
 * ●３回目
 * 　GetFlag    : 1711ms　
 * 　GetFlagInt : 5ms　
 *
 * 参考
 * https://qiita.com/stc1988/items/e6f76503ddf06fcf20b8
 * https://note.dokeep.jp/post/csharp-enum-flags/
 * https://ufcpp.net/study/csharp/oop/miscimplictinherit/
 * etc...
 *
 */