[

mood

|

anxious

]

Can someone give the important reasons/situations when it makes sense to use C++ rather than Java?

hex_bot

[

mood

|

chipper

]

Hello Everyone

i just thought I would introduce myself since I am new to the group.
I am a religious GNU/Linux user, programming addict, coffee addict,
book worm, and lame geeky joke enthusiast. :)
I am also a CS Student. My main interests are in
Operating Systems, Swarm Intelligence, and cognitive/social psychology.

Lately I have been writing my own source code editor. I hate the Vi editor.
I like emacs, although I think it is a bit overloaded for its purpose.
I mean, essentially from a command line point of view, a program
is in itself a function. But designing emacs  ( a function ) to be a web-browser,
email client, IM client etc... is just a walk off the reservation.
Sure, I could use a GUI based development environment but not a
big fan of GUI...
Anyway... I'm writing my own editor and I am finding it to be
a great experience.

I am interested in knowing about projects all of you are working on
and hearing your opinions and insights concerning computer science
and software engineering.

Looking to make friends who share interests, and continue
to grow a more active online community.

Cheers!

tangaroa

class UsefulClass  {
	public:
	usefulReadOnlyMethod(); // run me plz
	undesirableMethod();  // hide from coders 
};

class HasANotIsA {
	public:
	safeWrapper(){ foo->undesirableMethod(); } 

	protected: 
	UsefulClass foo; 
}

I want code using HasANotIsA to be able to run foo->usefulReadOnlyMethod() but not foo->undesirableMethod(). I can put the usefulClass in protected to hide the undesirable method, but that also hides the useful method. I can't take the UsefulClass out of protected and make it public without exposing the undesirable method.

Is there an alternative to wrapping every useful function inside HasANotIsA? That feels like a waste of time and would clutter up the class definition.

It seems that I want to change which methods of UsefulClass are public and which are private, which suggests I should extend the class, add a few wrappers where things change, and put the wrapperMethod in the extended class. I could then make the neutered class public in HasANotIsA. However, it is likely that future code could reach undesirableMethod() by implicitly casting it back to a UsefulClass during a general-purpose routine that has the most basic class as a parameter. Can this be avoided or discouraged?

synergetic

[

mood

|

annoyed

]

Hi all

I was wondering if any of you have any experience with compiling C++ mixed with C under Linux (using g++)?

I have some C functions that I've been given and I want to use them in a C++ program. Unfortunately, the compiler can't link to any of the C functions I've used. I've looked on the internet and all it says is that I have to enclose the C decelerations in an extern "C" statement and use the C++ compiler to compile main and link it all together. Unfortunately, the functions are already enclosed in an extern "C" statement, I'm already using the C++ compiler to compile main and link and I'm getting rather sick and tired of having the internet tell me that all is well with my set up.

Anyway, have any of you had this kind of a problem? Do you have any advice?

Thanks.

Edit: Solved. Turned out not to be a linker error at all, but a preprocessor error. The code I was given had a #ifdef command right at the beginning. I figured out that I had to look for it beacuse, when using ld's manual page, it mentioned the (extremely useful) objdump command. I objdump -d the offending .o file and found it empty of all content.
If you've read this, thank you anyway, it helped me to post about it and then I could think a bit more clearly.

assassin437

   1) cout << "Enter two numbers, of which only one should be a \'7\'";
   2) int a, b;
   3) cin >> a;
   4) cout << "\n";
   5) cin >> b;
   6) 
   7) if  (((a||b)&&!(a&&b)) == 7)
   8) 
   9) {cout << "woo";}
  10) 
  11) 
  12)     return 0;