C＃：数字通用接口

我正在尝试执行一些与数字类型无关的通用数字操作。但是，我知道没有办法使用泛型来做到这一点。第一个想法是使用where语句过滤传入类型，但所有数字类型都是关闭的，因此对于通用过滤器无效。此外，泛型不允许标准的数字操作（添加，移位等），所以我唯一可以提出的解决方案是重新编写每种方法的非泛型。任何其他想法？C＃：数字通用接口

仅供参考，以下是我最初试图代码：

private const int BYTE_SIZE = 8; 

    private const int UINT16_SIZE = 16; 

    private const int UINT32_SIZE = 32; 

    private const int UINT64_SIZE = 64; 

    public static byte[] ToBytes(UInt16[] pnaValues) 
    { 
     return ToSmaller<byte, UInt16>(pnaValues, BYTE_SIZE, UINT16_SIZE); 
    } 

    public static byte[] ToBytes(UInt32[] pnaValues) 
    { 
     return ToSmaller<byte, UInt32>(pnaValues, BYTE_SIZE, UINT32_SIZE); 
    } 

    .... 

    public static UInt16[] ToUInt16s(byte[] pnaValues) 
    { 
     return ToLarger<UInt16, byte>(pnaValues, UINT16_SIZE, BYTE_SIZE); 
    } 

    public static UInt16[] ToUInt16s(UInt32[] pnaValues) 
    { 
     return ToSmaller<UInt16, UInt32>(pnaValues, UINT16_SIZE, UINT32_SIZE); 
    } 

    ... 

    public static UInt64[] ToUInt64s(UInt32[] pnaValues) 
    { 
     return ToLarger<UInt64, UInt32>(pnaValues, UINT64_SIZE, UINT32_SIZE); 
    } 

    private static TLarger[] ToLarger<TLarger, TSmaller>(TSmaller[] pnaSmaller, int pnLargerSize, int pnSmallerSize) 
     where TLarger : byte, UInt16, UInt32, UInt64 
     where TSmaller : byte, UInt16, UInt32, UInt64 
    { 
     TLarger[] lnaRetVal = null; 
     int lnSmallerPerLarger = pnLargerSize/pnSmallerSize; 

     System.Diagnostics.Debug.Assert((pnLargerSize % pnSmallerSize) == 0); 

     if (pnaSmaller != null) 
     { 
      System.Diagnostics.Debug.Assert((pnaSmaller % lnSmallerPerLarger) == 0); 

      lnaRetVal = new TLarger[pnaSmaller.Length/lnSmallerPerLarger]; 

      for (int i = 0; i < lnaRetVal.Length; i++) 
      { 
       lnaRetVal[i] = 0; 

       for (int j = 0; j < lnSmallerPerLarger; j++) 
       { 
        lnaRetVal[i] = (lnaRetVal[i] << pnLargerSize) + pnaSmaller[i * lnSmallerPerLarger + j]; 
       } 
      } 
     } 

     return lnaRetVal; 
    } 

    private static TSmaller[] ToSmaller<TSmaller, TLarger>(TLarger[] pnaLarger, int pnSmallerSize, int pnLargerSize) 
     where TSmaller : byte, UInt16, UInt32, UInt64 
     where TLarger : byte, UInt16, UInt32, UInt64 
    { 
     TSmaller[] lnaRetVal = null; 
     int lnSmallerPerLarger = pnLargerSize/pnSmallerSize; 

     System.Diagnostics.Debug.Assert((pnLargerSize % pnSmallerSize) == 0); 

     if (pnaSmaller != null) 
     { 
      lnaRetVal = new TSmaller[pnaLarger.Length * lnSmallerPerLarger]; 

      for (int i = 0; i < lnaRetVal.Length; i++) 
      { 
       for (int j = 0; j < lnSmallerPerLarger; j++) 
       { 
        lnaRetVal[i * lnSmallerPerLarger + (lnSmallerPerLarger - 1 - j)] 
         = pnaLarger[i] >> (j * pnLargerSize); 
       } 
      } 
     } 

     return lnaRetVal; 
    }

来源

2009-08-24 David Beckman