Expression in enum

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  • =?Utf-8?B?TFBldGVy?=
    #1

    Expression in enum


    Hi,


    I often wrote my constants in C/C++ in the following form:

    #define FOURCC(c0, c1, c2, c3) ( ((DWORD)(c0)) | ((DWORD)(c1) << 8) |
    ((DWORD)(c2) << 16) | ((DWORD)(c3) << 24) )

    #define CONST_A FOURCC('A','B', 'C','D') // A-tag: "ABCD"
    #define CONST_B FOURCC('E','F', 'G','H') // B-tag: "EFGH"
    #define CONST_C FOURCC('I','J', 'K','L') // C-tag: "IJKL"



    How can I write constant (I would prefer enum) in C# tastefully?
    I tried the enums and constant variables of a class but either accept direct
    expressions only:

    public enum MyConstants
    {
    public None = ('\0' | ('\0' << 8) | ('\0' << 16) | ('\0' << 24)),

    public A = ('A' | ('B' << 8) | ('C' << 16) | ('D' << 24)),
    public B = ('E' | ('F' << 8) | ('G' << 16) | ('H' << 24)),
    public C = ('I' | ('J' << 8) | ('K' << 16) | ('L' << 24))
    }


    It would be nice if I used the following form (or something similar):

    public enum MyConstants
    {
    public None = FOURCC('\0','\0 ','\0','\0'),

    public A = FOURCC('A','B', 'C','D'),
    public B = FOURCC('E','F', 'G','H'),
    public C = FOURCC('I','J', 'K','L')
    }


    Thanks for any good suggestion.


    LPeter



    Tags: None
    • =?Utf-8?B?TFBldGVy?=
      #2
      RE: Expression in enum


      OOps! Of course, the public keywords (before enum fields) must be ignored.


        Comment

        • Stan
          #3
          Re: Expression in enum

          On 4 May, 19:34, LPeter <LPe...@discuss ions.microsoft. comwrote:
          Hi,
          >
          I often wrote my constants in C/C++ in the following form:
          >
          #define FOURCC(c0, c1, c2, c3) ( ((DWORD)(c0)) | ((DWORD)(c1) << 8) |
          ((DWORD)(c2) << 16) | ((DWORD)(c3) << 24) )
          >
          #define CONST_A FOURCC('A','B', 'C','D') // A-tag: "ABCD"
          #define CONST_B FOURCC('E','F', 'G','H') // B-tag: "EFGH"
          #define CONST_C FOURCC('I','J', 'K','L') // C-tag: "IJKL"
          >
          How can I write constant (I would prefer enum) in C# tastefully?
          I tried the enums and constant variables of a class but either accept direct
          expressions only:
          >
          public enum MyConstants
          {
                  public None = ('\0' | ('\0' << 8) | ('\0' << 16) | ('\0'<< 24)),
          >
                  public A = ('A' | ('B' << 8) | ('C' << 16) | ('D' << 24)),
                  public B = ('E' | ('F' << 8) | ('G' << 16) | ('H' << 24)),
                  public C = ('I' | ('J' << 8) | ('K' << 16) | ('L' << 24))
          >
          }
          >
          It would be nice if I used the following form (or something similar):
          >
          public enum MyConstants
          {
                  public None = FOURCC('\0','\0 ','\0','\0'),
          >
                  public A = FOURCC('A','B', 'C','D'),
                  public B = FOURCC('E','F', 'G','H'),
                  public C = FOURCC('I','J', 'K','L')
          >
          }
          >
          Thanks for any good suggestion.
          >
          LPeter
          Shouldn't you be using struct rather than enum ?

            Comment

            • =?Utf-8?B?TFBldGVy?=
              #4
              Re: Expression in enum



              "Stan" wrote:
              On 4 May, 19:34, LPeter <LPe...@discuss ions.microsoft. comwrote:
              Hi,

              I often wrote my constants in C/C++ in the following form:

              #define FOURCC(c0, c1, c2, c3) ( ((DWORD)(c0)) | ((DWORD)(c1) << 8) |
              ((DWORD)(c2) << 16) | ((DWORD)(c3) << 24) )

              #define CONST_A FOURCC('A','B', 'C','D') // A-tag: "ABCD"
              #define CONST_B FOURCC('E','F', 'G','H') // B-tag: "EFGH"
              #define CONST_C FOURCC('I','J', 'K','L') // C-tag: "IJKL"

              How can I write constant (I would prefer enum) in C# tastefully?
              I tried the enums and constant variables of a class but either accept direct
              expressions only:

              public enum MyConstants
              {
              public None = ('\0' | ('\0' << 8) | ('\0' << 16) | ('\0' << 24)),

              public A = ('A' | ('B' << 8) | ('C' << 16) | ('D' << 24)),
              public B = ('E' | ('F' << 8) | ('G' << 16) | ('H' << 24)),
              public C = ('I' | ('J' << 8) | ('K' << 16) | ('L' << 24))

              }

              It would be nice if I used the following form (or something similar):

              public enum MyConstants
              {
              public None = FOURCC('\0','\0 ','\0','\0'),

              public A = FOURCC('A','B', 'C','D'),
              public B = FOURCC('E','F', 'G','H'),
              public C = FOURCC('I','J', 'K','L')

              }

              Thanks for any good suggestion.

              LPeter
              >
              Shouldn't you be using struct rather than enum ?
              >
              What are you thinking for?
              LPeter


                Comment

                • =?UTF-8?B?TGFzc2UgVsOlZ3PDpnRoZXIgS2FybHNlbg==?=
                  #5
                  Re: Expression in enum

                  LPeter wrote:
                  Hi,
                  >
                  >
                  I often wrote my constants in C/C++ in the following form:
                  >
                  #define FOURCC(c0, c1, c2, c3) ( ((DWORD)(c0)) | ((DWORD)(c1) << 8) |
                  ((DWORD)(c2) << 16) | ((DWORD)(c3) << 24) )
                  >
                  #define CONST_A FOURCC('A','B', 'C','D') // A-tag: "ABCD"
                  #define CONST_B FOURCC('E','F', 'G','H') // B-tag: "EFGH"
                  #define CONST_C FOURCC('I','J', 'K','L') // C-tag: "IJKL"
                  >
                  >
                  >
                  How can I write constant (I would prefer enum) in C# tastefully?
                  I tried the enums and constant variables of a class but either accept direct
                  expressions only:
                  >
                  public enum MyConstants
                  {
                  public None = ('\0' | ('\0' << 8) | ('\0' << 16) | ('\0' << 24)),
                  >
                  public A = ('A' | ('B' << 8) | ('C' << 16) | ('D' << 24)),
                  public B = ('E' | ('F' << 8) | ('G' << 16) | ('H' << 24)),
                  public C = ('I' | ('J' << 8) | ('K' << 16) | ('L' << 24))
                  }
                  >
                  >
                  It would be nice if I used the following form (or something similar):
                  >
                  public enum MyConstants
                  {
                  public None = FOURCC('\0','\0 ','\0','\0'),
                  >
                  public A = FOURCC('A','B', 'C','D'),
                  public B = FOURCC('E','F', 'G','H'),
                  public C = FOURCC('I','J', 'K','L')
                  }
                  >
                  >
                  Thanks for any good suggestion.
                  >
                  >
                  LPeter
                  >
                  >
                  >
                  The only way to get "expression s in enum" is to use some kind of code
                  generator or pre-processor, neither of which is built into C#.

                  I'd say you'll just have to hardcode the values.

                  public enum MyConstants
                  {
                  None = 0x00000000,
                  A = 0x40414243,
                  B = 0x44454647
                  }

                  (I don't know how FOURCC combines the values so the above example values
                  are probably wrong, you'll need to figure out the right values yourself)

                  --
                  Lasse Vågsæther Karlsen
                  mailto:lasse@vk arlsen.no
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                    Comment

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