[英]What is a better way to pack 4 ints into ulong?
我需要將多個int值(每個值僅介於0到999之間)打包到ulong中。 我有如下工作方法,但是可以對其進行優化嗎?
我知道它會傷害您的眼睛,很多0表示抱歉。
public class Test {
public void Start() {
ulong testValue = 444333222111;
Debug.Log(GetValue1(testValue) + " " + GetValue2(testValue) + " " + GetValue3(testValue) + " " + GetValue4(testValue)); // = 111 222 333 444
SetValue1(ref testValue, 55);
SetValue2(ref testValue, 9);
SetValue3(ref testValue, 111);
SetValue4(ref testValue, 999);
Debug.Log(testValue); // = 999111009055
Debug.Log(GetValue1(testValue) + " " + GetValue2(testValue) + " " + GetValue3(testValue) + " " + GetValue4(testValue)); // = 55 9 111 999
}
public int GetValue1(ulong i) => (int)(i % 1000);
public void SetValue1(ref ulong i, int value) => i = i / 1000 * 1000 + (ulong)value;
public int GetValue2(ulong i) => (int)(i % 1000000 / 1000);
public void SetValue2(ref ulong i, int value) => i = i / 1000000 * 1000000 + (ulong)value * 1000 + i % 1000;
public int GetValue3(ulong i) => (int)(i % 1000000000 / 1000000);
public void SetValue3(ref ulong i, int value) => i = i / 1000000000 * 1000000000 + (ulong)value * 1000000 + i % 1000000;
public int GetValue4(ulong i) => (int)(i % 1000000000000 / 1000000000);
public void SetValue4(ref ulong i, int value) => i = i / 1000000000000 * 1000000000000 + (ulong)value * 1000000000 + i % 1000000000;
}
干得好。 首先創建一個[StructLayout(LayoutKind.Explicit)]
結構,如下所示:
[StructLayout(LayoutKind.Explicit)]
public struct FourWords
{
[FieldOffset(0)] public ulong Whole;
[FieldOffset(0)] public ushort First;
[FieldOffset(2)] public ushort Second;
[FieldOffset(4)] public ushort Third;
[FieldOffset(6)] public ushort Fourth;
}
然后,您可以按預期訪問每個“第一”,“第二” ...字段:
FourWords test = new FourWords();
test.Second = 0x101;
test.Fourth = 0xA0A;
var xyz = test.Whole;
如果在調試器中查看xyz(在十六進制視圖中),則會看到:
xyz, h 0x0a0a000001010000 ulong
您會看到101和A0A。
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