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v65magnaebayer@hotmail.co
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 Posted: Sat Jan 29, 2005 4:54 am Post subject: Possible to #define an array? |
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I'm translating some code from Java into C++, and I'd like to know if
it's possible to #define an array. Can't quite get the syntax down.
This is the Java:
private static final int AUTH_PLAINTEXT = 0;
private static final int AUTH_DIGEST = 1;
private static final int AUTH_SASL = 2;
private static final int NUM_AUTH_MECHANISMS = 3;
private static final String[] AUTH_MECHANISMS = new String[] {
"plaintext", "digest", "SASL" };
This is my C++:
enum AUTH_MECHS {
AUTH_PLAINTEXT = 0,
AUTH_DIGEST,
AUTH_SASL,
NUM_AUTH_MECHANISMS
};
#define AUTH_MECHANISMS[NUM_AUTH_MECHANISMS] {"plaintext ", "digest "
}
That #define obviously doesn't work. I know I can just make a quick and
dirty inline method with a switch to do what I want, but if I can
#define the array I'd rather do that.
Thanks.
Charles.
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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Ivan Vecerina
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| Posted: Sat Jan 29, 2005 9:33 am Post subject: Re: Possible to #define an array? |
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<v65magnaebayer (AT) hotmail (DOT) com> wrote
| Quote: | I'm translating some code from Java into C++, and I'd like to know if
it's possible to #define an array. Can't quite get the syntax down.
This is the Java:
private static final int AUTH_PLAINTEXT = 0;
private static final int AUTH_DIGEST = 1;
private static final int AUTH_SASL = 2;
private static final int NUM_AUTH_MECHANISMS = 3;
private static final String[] AUTH_MECHANISMS = new String[] {
"plaintext", "digest", "SASL" };
This is my C++:
enum AUTH_MECHS {
AUTH_PLAINTEXT = 0,
AUTH_DIGEST,
AUTH_SASL,
NUM_AUTH_MECHANISMS
};
#define AUTH_MECHANISMS[NUM_AUTH_MECHANISMS] {"plaintext ", "digest "
|
Note that string literals ("...") automatically include a trailing NULL,
so adding an explicit termination is not necessary.
| Quote: | }
That #define obviously doesn't work. I know I can just make a quick and
dirty inline method with a switch to do what I want, but if I can
#define the array I'd rather do that.
|
Try something like:
const char const* AUTH_MECHANISMS[NUM_AUTH_MECHANISMS] =
{ "plaintext", "digest", "SASL" };
or:
const std::string AUTH_MECHANISMS[NUM_AUTH_MECHANISMS] =
{ "plaintext", "digest", "SASL" };
hth,
Ivan
--
http://ivan.vecerina.com/contact/?subject=NG_POST <- email contact form
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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Falk Tannhäuser
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| Posted: Sun Jan 30, 2005 4:04 am Post subject: Re: Possible to #define an array? |
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[email]v65magnaebayer (AT) hotmail (DOT) com[/email] wrote:
| Quote: | I'm translating some code from Java into C++, and I'd like to know if
it's possible to #define an array. Can't quite get the syntax down.
[snip]
This is my C++:
enum AUTH_MECHS {
AUTH_PLAINTEXT = 0,
AUTH_DIGEST,
AUTH_SASL,
NUM_AUTH_MECHANISMS
};
#define AUTH_MECHANISMS[NUM_AUTH_MECHANISMS] {"plaintext ", "digest "
}
|
That should be
extern char const* const AuthMechanisms[NUM_AUTH_MECHANISMS];
as *declaration* in the header file, together with the enum.
Furthermore, you need to *define* this array in exactly one
compilation unit (.C or .cxx file):
char const* const AuthMechanisms[NUM_AUTH_MECHANISMS] =
{ "plaintext", "digest", "SASL" };
If these definitions are part of a class (which is possible in
C++, too - but unlike in Java, it is not mandatory), you would
put
class SomeClass
{
...
enum AUTH_MECHS
{
AUTH_PLAINTEXT,
AUTH_DIGEST,
AUTH_SASL,
NUM_AUTH_MECHANISMS
};
static char const* const AuthMechanisms[NUM_AUTH_MECHANISMS];
};
in the header file and
char const* const SomeClass::AuthMechanisms[NUM_AUTH_MECHANISMS] =
{ "plaintext", "digest", "SASL" };
in a .C file (typically the one where the other class members are
defined).
Falk
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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