[Lua]位运算

参考链接：https://blog.csdn.net/xiaodaidabin/article/details/7968523

 

bit.lua

--lua 位运算
--[[bit.data32:
2147483648,1073741824,536870912,268435456,134217728,67108864,33554432,16777216
,8388608,4194304,2097152,1048576,524288,262144,131072,65536
,32768,16384,8192,4096,2048,1024,512,256
,128,64,32,16,8,4,2,1--]]

bit = {};
bit.data32 = {};
for i=1,32 do
    bit.data32[i] = 2 ^ (32 - i);
    print(bit.data32[i]);
end

--十进制转二进制
function bit:d2b(arg)
    local temp = {};
    for i=1,32 do
        if (arg >= self.data32[i]) then
            temp[i] = 1;
            arg = arg - self.data32[i];
        else
            temp[i] = 0;
        end
    end
    return temp;
end

--二进制转十进制
function bit:b2d(arg)
    local temp = 0;
    for i=1,32 do
        if (arg[i] == 1) then
            temp = temp + 2 ^ (32 - i);
        end
    end
    return temp;
end

--打印二进制
function bit:print(arg)
    local temp = "";
    for i=1,32 do
        temp = temp .. arg[i];
    end
    print(temp);
end

--测试
local temp = bit:d2b(8);
bit:print(temp);
print(bit:b2d(temp));

 

应用场合：

一、配置字段缩减

如果存在多个bool型字段，则可以使用一个int型来代替，一个位代表一个字段。下面提供一个工具，其作用是对指定目录下的csv文件，计算其替代值，并保存在最后一列。

using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEditor;
using UnityEngine;

public class BitConvertTool {

    private static string configDir = Application.dataPath + "/Config";

    [MenuItem("Tools/BitConvert")]
    static void Convert()
    {
        string[] filePaths = Directory.GetFiles(configDir, "*.csv", SearchOption.AllDirectories);
        for (int i = 0; i < filePaths.Length; i++)
        {
            string filePath = filePaths[i];
            List<List<string>> result = CSVTool.Read(filePath, Encoding.Default);
            //CSVTool.Debug(result);

            //获取结果
            for (int j = 0; j < result.Count; j++)
            {
                double sum = 0;
                List<string> line = result[j];
                for (int k = 0; k < line.Count; k++)
                {
                    if ((j != 0) && (k != 0) && (k != (line.Count - 1)))
                    {
                        string field = line[k];
                        int num = int.Parse(field);
                        if (num == 1)
                        {
                            sum = sum + Mathf.Pow(2f, 32 - k);
                            //Debug.LogError(Mathf.Pow(2f, 32 - k));
                        }
                        //Debug.Log(num);
                    }
                    if ((j != 0) && (k == (line.Count - 1)))
                    {
                        result[j][k] = sum.ToString();
                    }
                }
            }

            //写入结果
            CSVTool.Write(filePath, Encoding.Default, result);
        }
        Debug.Log("BitConvert Finish");
    }
}

文件格式如下：