dev-cpp-users Mailing List for Dev-C++

But then again - do _not ever_ use a vendor-specific extension unless you
are _absolutely 100% sure_ that the code need _never ever_ be ported to a
different compiler.

Until the official standard have incorporated __VA_ARGS__ support (and
more than one vendor have implemented it according to the standard), it
really should not be used.

Given the billions of lines of existing code without use of __VA_ARGS__,
it really isn't such an important function that it is worth it to ignore
the current language standard.

/Per W

On Sun, 18 Dec 2005, Daniel K. O. wrote:

> Minds Work wrote:
>
> > That page said that MACRO functions with variable number of arguments
> > are only available in C99 and in some C++ compilers (but not in my
> > compiler :-( )
>
>
> Well, if you aren't using Dev-C++/MinGW maybe you'll need some other
> non-standard extension provided by your compiler vendor.
> MinGW/GCC accepts __VA_ARGS__ just fine on C++.
>
>
> ---
> Daniel K. O.

Minds Work wrote:

> That page said that MACRO functions with variable number of arguments 
> are only available in C99 and in some C++ compilers (but not in my 
> compiler :-( )


Well, if you aren't using Dev-C++/MinGW maybe you'll need some other 
non-standard extension provided by your compiler vendor.
MinGW/GCC accepts __VA_ARGS__ just fine on C++.


---
Daniel K. O.


	

	
		
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No default arguments possible.

/Per W

On Sun, 18 Dec 2005, Minds Work wrote:

> Hi Daniel,
>
> Thanks for the link.
>
> That page said that MACRO functions with variable number of arguments are
> only available in C99 and in some C++ compilers (but not in my compiler :=
-(
> )
>
> So I cant use MACRO Functions with  variable number of arguments, but is
> there a way to se use MACRO FUNCTIONS with default args?
> (like; void foo(const char* msg, int b =3D 0))
>
> On 12/18/05, Daniel K. O. <dan...@ya...> wrote:
> >
> > Minds Work wrote:
> >
> > > Is there a way to change the #define LOG_INFO to receive a variable
> > > number of parameters to use the new LOG->info method?
> >
> >
> > See:
> > http://david.tribble.com/text/cdiffs.htm#C99-pp-vararg
> >
> >
> > ---
> > Daniel K. O.
> >
> >
> >
> >
> >
> >
> > _______________________________________________________
> > Yahoo! doce lar. Fa=E7a do Yahoo! sua homepage.
> > http://br.yahoo.com/homepageset.html
> >
> >
> >
>

Hi Daniel,

Thanks for the link.

That page said that MACRO functions with variable number of arguments are
only available in C99 and in some C++ compilers (but not in my compiler :-(
)

So I cant use MACRO Functions with  variable number of arguments, but is
there a way to se use MACRO FUNCTIONS with default args?
(like; void foo(const char* msg, int b =3D 0))

On 12/18/05, Daniel K. O. <dan...@ya...> wrote:
>
> Minds Work wrote:
>
> > Is there a way to change the #define LOG_INFO to receive a variable
> > number of parameters to use the new LOG->info method?
>
>
> See:
> http://david.tribble.com/text/cdiffs.htm#C99-pp-vararg
>
>
> ---
> Daniel K. O.
>
>
>
>
>
>
> _______________________________________________________
> Yahoo! doce lar. Fa=E7a do Yahoo! sua homepage.
> http://br.yahoo.com/homepageset.html
>
>
>

Sometimes it's possible to use a #define that doesn't take any parameters:

#include <cstdarg>
#include <cstdio>

#define LOG log

void log(const char *msg,...) {
    va_list ap;

    va_start(ap,msg);
    vprintf(msg,ap);
    va_end(ap);
}

int main() {
    LOG("test %u %u\n",1,2);
    return 0;
}

/Per W

On Sun, 18 Dec 2005, Daniel K. O. wrote:

> Minds Work wrote:
>
> > Is there a way to change the #define LOG_INFO to receive a variable
> > number of parameters to use the new LOG->info method?
>
>
> See:
> http://david.tribble.com/text/cdiffs.htm#C99-pp-vararg
>
>
> ---
> Daniel K. O.
>
>
>
>
>
>
> _______________________________________________________
> Yahoo! doce lar. Fa=E7a do Yahoo! sua homepage.
> http://br.yahoo.com/homepageset.html
>
>
>
>
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Minds Work wrote:

> Is there a way to change the #define LOG_INFO to receive a variable 
> number of parameters to use the new LOG->info method?


See:
http://david.tribble.com/text/cdiffs.htm#C99-pp-vararg


---
Daniel K. O.


	

	
		
_______________________________________________________ 
Yahoo! doce lar. Faça do Yahoo! sua homepage. 
http://br.yahoo.com/homepageset.html 

On 12/17/05, Jan jan <ja...@ho...> wrote:
> Anyone knw how to send 6 random variable (e.g XXXXXX) using visual basic
> 6.0?

in the devcpp list?  c'mon, rather tactless...
http://groups.google.com/group/progav?lnk=3Doa would be a much more
appropriate list.  While I personally wouldn't be so blunt, as my
friend would say: "get your microsoft-contaminated code away from my
computer!"

> can send me any sample? pls advise!

Send from where to where?  Using what?  Be very specific, since what
you just asked would be very easy to interpret in many different ways.

<html><div style='background-color:'><P>hi all</P>
<P>Anyone knw how to send 6 random variable (e.g XXXXXX)&nbsp;using visual basic 6.0?</P>
<P>can&nbsp;send me any sample? pls advise! <BR><BR></P>
<DIV>
<P>&nbsp;</P>
<P>&nbsp;</P></DIV></div><br clear=all><hr> <a href="http://g.msn.com/8HMBENUS/2737??PS=47575" target="_top">Find e-mail, documents and more on your PC instantly with Windows Desktop Search–FREE!</a> </html>

Hi,

I know we can #define "functions" in C/C++, like this :

#define LOG_INFO(msg) if(LOG->isInfoEnabled()) { LOG->info(__FILE__,
__LINE__, msg);}

We use this #define to simplify the LOG code.

But now we change the info method to receive a variable number of parameter=
s
(so the info can used like the printf function), the info signature changed
from:

void info(const* char file, int line, const char* msg);

to:

void info(const* char file, int line, const char* msg, ...);

Is there a way to change the #define LOG_INFO to receive a variable number
of parameters to use the new LOG->info method?

[]s
Freddy

On 12/17/05, Jason Benjamin <red...@ya...> wrote:
> What is the use of pointers, linked lists,
> polymorphism,and operator overloading?

Well, these things are all indespensible.  You don't have to use them
at every possible chance, but they can make life much easier.

First, the thing I do know a bit about, is pointers.  Coming from
Java, this is a really cool thing.  In Java, unless you're using a
global variable, you have to return a object/variable if you want to
keep any changes made to it during a function's execution.  There
isn't a easy way to keep the changes made to multiple variables,
except by using arrays.  Mixed object/variable types?  Things can get
very complex very quickly.  Enter pointers.  By using a pointer you
can directly use a variable.  This can be dangerous, but it can also
be very powerful.

I don't know anything about linked lists yet, so I can't speak for that.

Polymorphism is very powerful.  Look at virtual functions and you'll
quickly find it's realy strength.  Operator overloading is
indespensible.  Consider the "=3D" operator.  it's actually overloaded
to work with multiple data types.


All these things have purposes.  While you and I might not understand
all of them, they are there for a reason.

Pointers, linked lists and polymorphism allows you to dynamically allocate
and create data structures while the program is running - for example
to handle end-user commands.

Operator overloading is mainly to allow cleaner code, thereby keeping down
the maintenance costs.

Where to find info how to use the concepts? Google of course...

/Per W

On Sat, 17 Dec 2005, Jason Benjamin wrote:

> What is the use of pointers, linked lists,
> polymorphism,and operator overloading?
>
> If useful, how are they useful and where do I find
> good tutorials on these subjects?
>
>
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