D - enum : type ???
- Russ Lewis <spamhole-2001-07-16 deming-os.org> Apr 09 2002
- "Walter" <walter digitalmars.com> Apr 09 2002
- "OddesE" <OddesE_XYZ hotmail.com> Apr 09 2002
- Russ Lewis <spamhole-2001-07-16 deming-os.org> Apr 09 2002
- "Walter" <walter digitalmars.com> Apr 09 2002
In com.d (in the newest D alpha source), there is this declaration:
enum : int
{
S_OK = 0,
S_FALSE = 0x00000001,
NOERROR = 0,
E_NOTIMPL = 0x80004001,
E_NOINTERFACE = 0x80004002,
E_POINTER = 0x80004003,
E_ABORT = 0x80004004,
E_FAIL = 0x80004005,
E_HANDLE = 0x80070006,
CLASS_E_NOAGGREGATION = 0x80040110,
E_OUTOFMEMORY = 0x8007000E,
E_INVALIDARG = 0x80070057,
E_UNEXPECTED = 0x8000FFFF,
}
Does D allow you to specify the underlying type of an enum, then?
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Apr 09 2002
"Russ Lewis" <spamhole-2001-07-16 deming-os.org> wrote in message news:3CB329ED.C26B55E7 deming-os.org...In com.d (in the newest D alpha source), there is this declaration: enum : int { S_OK = 0, S_FALSE = 0x00000001, NOERROR = 0, E_NOTIMPL = 0x80004001, E_NOINTERFACE = 0x80004002, E_POINTER = 0x80004003, E_ABORT = 0x80004004, E_FAIL = 0x80004005, E_HANDLE = 0x80070006, CLASS_E_NOAGGREGATION = 0x80040110, E_OUTOFMEMORY = 0x8007000E, E_INVALIDARG = 0x80070057, E_UNEXPECTED = 0x8000FFFF, } Does D allow you to specify the underlying type of an enum, then?
Yes!
Apr 09 2002
"Walter" <walter digitalmars.com> wrote in message news:a8vbhm$okj$1 digitaldaemon.com..."Russ Lewis" <spamhole-2001-07-16 deming-os.org> wrote in message news:3CB329ED.C26B55E7 deming-os.org...In com.d (in the newest D alpha source), there is this declaration: enum : int { S_OK = 0, S_FALSE = 0x00000001, NOERROR = 0, E_NOTIMPL = 0x80004001, E_NOINTERFACE = 0x80004002, E_POINTER = 0x80004003, E_ABORT = 0x80004004, E_FAIL = 0x80004005, E_HANDLE = 0x80070006, CLASS_E_NOAGGREGATION = 0x80040110, E_OUTOFMEMORY = 0x8007000E, E_INVALIDARG = 0x80070057, E_UNEXPECTED = 0x8000FFFF, } Does D allow you to specify the underlying type of an enum, then?
Yes!
I saw this too. Is the omission of an enum name a hack, or was it meant to be that way? How do you define a parameter to a function that takes such an enum, just as the same type? So int in this case? Could you explain this a bit more, I am quite intrigued by it! -- Stijn OddesE_XYZ hotmail.com http://OddesE.cjb.net _________________________________________________ Remove _XYZ from my address when replying by mail
Apr 09 2002
OddesE wrote:I saw this too. Is the omission of an enum name a hack, or was it meant to be that way? How do you define a parameter to a function that takes such an enum, just as the same type? So int in this case? Could you explain this a bit more, I am quite intrigued by it!
I've used unnamed enums before as a shorthand to declare a set of constants. It can be a lot easier to read, and gives the programmer a visual clue that all of the constants are related. In this case, it would be a set of int constants. -- The Villagers are Online! villagersonline.com .[ (the fox.(quick,brown)) jumped.over(the dog.lazy) ] .[ (a version.of(English).(precise.more)) is(possible) ] ?[ you want.to(help(develop(it))) ]
Apr 09 2002
"Walter" <walter digitalmars.com> "Russ Lewis" <spamhole-2001-07-16 deming-os.org> wrote in message news:3CB33CD5.ACF32C8A deming-os.org...OddesE wrote:I saw this too. Is the omission of an enum name a hack, or was it meant to be that way? How do you define a parameter to a function that takes such an enum, just as the same type? So int in this case? Could you explain this a bit more, I am quite intrigued by it!
constants. It can be a lot easier to read, and gives the programmer a visual clue that all of the constants are related. In this case, it would be a set of int constants.
You're right. Specifying no name for the enum creates an "anonymous" enum, which is just a convenient way to create a bunch of integer constants in the enclosing scope. They'll be typed as an "int" (or whatever the enum base type is), not an enum.
Apr 09 2002