OT: c++ q
hi
i have encountered a problem with g++
i have a class a, with forward declaration of a function "do_something" and
a constructor a(int val);
i implement them in a cpp file.
g++ complains of redefinition of the constructor but not of the
do_something() function.
why ?
files:
== a.h ===
class a {
int m_a;
a (int val);
void do_somthing()
}
== a.cpp ===
#include "a.h"
a::do_somthing {a.m_a++;};
a::a(int val):m_a(val) {};
any idea ?
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Re: OT: c++ q
Erez D wrote:
hi
i have encountered a problem with g++
i have a class a, with forward declaration of a function
"do_something" and a constructor a(int val);
i implement them in a cpp file.
g++ complains of redefinition of the constructor but not of the
do_something() function.
why ?
files:
== a.h ===
class a {
int m_a;
a (int val);
void do_somthing()
}
== a.cpp ===
#include "a.h"
a::do_somthing {a.m_a++;};
a::a(int val):m_a(val) {};
any idea ?
Send an actual couple of files. What you sent is impossible to debug (I
doubt g++ does not complain that do_somthing is defined with no return
type and no parenthesis).
Shachar
--
Shachar Shemesh
Lingnu Open Source Consulting Ltd.
http://www.lingnu.com
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Re: OT: c++ q
On Sun, Apr 26, 2009 at 3:43 PM, Shachar Shemesh wrote:
> Erez D wrote:
>
> hi
>
> i have encountered a problem with g++
>
> i have a class a, with forward declaration of a function "do_something" and
> a constructor a(int val);
> i implement them in a cpp file.
>
> g++ complains of redefinition of the constructor but not of the
> do_something() function.
>
> why ?
>
> files:
> == a.h ===
> class a {
> int m_a;
> a (int val);
> void do_somthing()
> }
>
> == a.cpp ===
> #include "a.h"
> a::do_somthing {a.m_a++;};
> a::a(int val):m_a(val) {};
>
>
>
>
> any idea ?
>
> Send an actual couple of files. What you sent is impossible to debug (I
> doubt g++ does not complain that do_somthing is defined with no return type
> and no parenthesis).
>
> Shachar
>
you are right. i just wanted to give a small example instead of send my
whole project to be inspected.
however after fixing the syntax of this small example, i can't seem to
duplicate the problem that happened in the project.
so thanks anyway.
erez.
>
> --
> Shachar Shemesh
> Lingnu Open Source Consulting Ltd.http://www.lingnu.com
>
>
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Re: OT: c++ q
Erez D wrote: you are right. i just wanted to give a small example instead of send my whole project to be inspected. Which I doubt anyone would. however after fixing the syntax of this small example, i can't seem to duplicate the problem that happened in the project. A clear symptom that the problem is not what you think it is. Try using "-E" on gcc - it tells it to run the C preprocessor and stop. Inspect the resulting file - it may reveal the problem. Shachar -- Shachar Shemesh Lingnu Open Source Consulting Ltd. http://www.lingnu.com ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: OT: c++ q
On Sun, Apr 26, 2009 at 4:07 PM, Shachar Shemesh wrote: > Erez D wrote: > > > > you are right. i just wanted to give a small example instead of send my > whole project to be inspected. > > Which I doubt anyone would. > i would not send my whole project as this is spamming (and other reasons too) > > however after fixing the syntax of this small example, i can't seem to > duplicate the problem that happened in the project. > > A clear symptom that the problem is not what you think it is. > > Try using "-E" on gcc - it tells it to run the C preprocessor and stop. > Inspect the resulting file - it may reveal the problem. > I should be so lucky ... as i have no #defines whatsoever, the preprocessor output was exactly what i expected. i found some voodoo though: > g++ -E -I . -c source/myclass.cpp > x.cpp > g++ -c x.cpp works fine, however: > g++ -I . -c source/myclass.cpp returns a "redefinition of ..." error > > Shachar > > -- > Shachar Shemesh > Lingnu Open Source Consulting Ltd.http://www.lingnu.com > > ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: OT: c++ q
On Sun, Apr 26, 2009 at 5:04 PM, Erez D wrote: > > > On Sun, Apr 26, 2009 at 4:07 PM, Shachar Shemesh wrote: > >> Erez D wrote: >> >> >> >> you are right. i just wanted to give a small example instead of send my >> whole project to be inspected. >> >> Which I doubt anyone would. >> > i would not send my whole project as this is spamming (and other reasons > too) > >> >> however after fixing the syntax of this small example, i can't seem to >> duplicate the problem that happened in the project. >> >> A clear symptom that the problem is not what you think it is. >> >> Try using "-E" on gcc - it tells it to run the C preprocessor and stop. >> Inspect the resulting file - it may reveal the problem. >> > I should be so lucky ... > as i have no #defines whatsoever, the preprocessor output was exactly what > i expected. > > i found some voodoo though: > > g++ -E -I . -c source/myclass.cpp > x.cpp > > g++ -c x.cpp > works fine, > however: > > g++ -I . -c source/myclass.cpp > returns a "redefinition of ..." error > the "funny" is that it does compile on my other computer without any problems so : i get an error on jaunty - gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) it compiles cleanly on intrepid - gcc version 4.3.2 (Ubuntu 4.3.2-1ubuntu12) > > > > >> >> Shachar >> >> -- >> Shachar Shemesh >> Lingnu Open Source Consulting Ltd.http://www.lingnu.com >> >> > ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: OT: c++ q
On Sunday 26 April 2009 15:38:53 Erez D wrote:
> files:
> == a.h ===
MISSING:
#ifndef __FILE_H__
> class a {
> int m_a;
> a (int val);
> void do_somthing()
> }
MISSING: semicolon, last line should be
};
MISSING:
#endif // __FILE_H__
> == a.cpp ===
> #include "a.h"
> a::do_somthing {a.m_a++;};
> a::a(int val):m_a(val) {};
>
GRADE: C- ~ 70.
Go back to school, and as punishment re-implement quick_sort in VB.NET.
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Re: OT: c++ q
diego, you didn't find all the errors, try again ;-)
On Sun, Apr 26, 2009 at 5:19 PM, Diego Iastrubni wrote:
> On Sunday 26 April 2009 15:38:53 Erez D wrote:
> > files:
> > == a.h ===
> MISSING:
> #ifndef __FILE_H__
> > class a {
> > int m_a;
> > a (int val);
> > void do_somthing()
> > }
> MISSING: semicolon, last line should be
> };
>
> MISSING:
> #endif // __FILE_H__
>
> > == a.cpp ===
> > #include "a.h"
> > a::do_somthing {a.m_a++;};
> > a::a(int val):m_a(val) {};
> >
>
> GRADE: C- ~ 70.
> Go back to school, and as punishment re-implement quick_sort in VB.NET.
>
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>
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Re: OT: c++ q
Diego Iastrubni wrote:
On Sunday 26 April 2009 15:38:53 Erez D wrote:
files:
== a.h ===
MISSING:
#ifndef __FILE_H__
There is no syntactical requirement to place those. If you do place
those, it is customary to call them after the file's name. Also, "__" is
only prepended to system includes, so it should have been:
#ifndef A_H
Also, you forgot to add:
#define A_H
which is, after all, the reason we go through the trouble of putting the
#ifndef to begin with.
class a {
int m_a;
a (int val);
void do_somthing()
}
MISSING: semicolon, last line should be
};
MISSING:
#endif // __FILE_H__
== a.cpp ===
#include "a.h"
a::do_somthing {a.m_a++;};
a::a(int val):m_a(val) {};
Missed lots and lots and lots of errors in this file.
GRADE: C- ~ 70.
Go back to school, and as punishment re-implement quick_sort in VB.NET.
Now that's going the "cruel and unusual" route.
I do think every programmer should take the time to implement binary
search and quick sort at least once from scratch. The number of corner
cases there is outstanding, and it is a great practice of thinking of
the fine details.
Shachar
--
Shachar Shemesh
Lingnu Open Source Consulting Ltd.
http://www.lingnu.com
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where are now ubuntu gutsy repositories ?
Shalom, I need to install kernel headres for Ubuntu gutsy, but gutsy is no more on Canonical servers. Where it goes ? I found the required package on net and tryed to install it, but it requires some linux-headers-2.6.22-14 package, but this pakage does not exist. This way I put itself int dependency mess and I am afraid apt database is corrupted. How can I check and repair apt database ??? dpkg -i linux-headers-2.6.22-14-generic_2.6.22-14.52_i386.deb (Reading database ... 130398 files and directories currently installed.) Preparing to replace linux-headers-2.6.22-14-generic 2.6.22-14.52 (using linux-headers-2.6.22-14-generic_2.6.22-14.52_i386.deb) ... Unpacking replacement linux-headers-2.6.22-14-generic ... dpkg: dependency problems prevent configuration of linux-headers-2.6.22-14-generic: linux-headers-2.6.22-14-generic depends on linux-headers-2.6.22-14; however: Package linux-headers-2.6.22-14 is not installed. dpkg: error processing linux-headers-2.6.22-14-generic (--install): dependency problems - leaving unconfigured Errors were encountered while processing: linux-headers-2.6.22-14-generic ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: where are now ubuntu gutsy repositories ?
Gutsy has arrived to it's end of life. there are two Ubuntu versions release each year. One for five year, and one for a year. The years are the support years of course. As far as I know 8.10 aka Intrepid Ibex replacing it. On October a new version will replace 8/10 afaik. Ido On Sun, Apr 26, 2009 at 6:49 PM, Lev Olshvang wrote: > Shalom, > > > I need to install kernel headres for Ubuntu gutsy, but gutsy is no more on > Canonical servers. > > > Where it goes ? > > I found the required package on net and tryed to install it, but it requires > some linux-headers-2.6.22-14 package, but this pakage does not exist. > > This way I put itself int dependency mess and I am afraid apt database is > corrupted. > How can I check and repair apt database ??? > > > > dpkg -i linux-headers-2.6.22-14-generic_2.6.22-14.52_i386.deb > (Reading database ... 130398 files and directories currently installed.) > Preparing to replace linux-headers-2.6.22-14-generic 2.6.22-14.52 (using > linux-headers-2.6.22-14-generic_2.6.22-14.52_i386.deb) ... > Unpacking replacement linux-headers-2.6.22-14-generic ... > dpkg: dependency problems prevent configuration of > linux-headers-2.6.22-14-generic: > linux-headers-2.6.22-14-generic depends on linux-headers-2.6.22-14; however: > Package linux-headers-2.6.22-14 is not installed. > dpkg: error processing linux-headers-2.6.22-14-generic (--install): > dependency problems - leaving unconfigured > Errors were encountered while processing: > linux-headers-2.6.22-14-generic > > > ___ > Linux-il mailing list > Linux-il@cs.huji.ac.il > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il > ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: where are now ubuntu gutsy repositories ?
On Sun, 26 Apr 2009, Lev Olshvang wrote: I need to install kernel headres for Ubuntu gutsy, but gutsy is no more on Canonical servers. Where it goes ? http://old-releases.ubuntu.com/ubuntu/ Geoff. ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Swiftouch remaining stuff
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Re: OT: c++ q
On Sunday 26 April 2009 17:31:59 Shachar Shemesh wrote: > > Go back to school, and as punishment re-implement quick_sort in VB.NET. > > Now that's going the "cruel and unusual" route. > > I do think every programmer should take the time to implement binary > search and quick sort at least once from scratch. The number of corner > cases there is outstanding, and it is a great practice of thinking of > the fine details. Beeing a little serious: I am not sure quick_sort is a must, as quite frankly it's a reall mess and I don't understand it. But heap sort and binary sort, yes. Those are a must. /me will need to back to the books and remember how heap sort works ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: OT: c++ q
Diego Iastrubni wrote: On Sunday 26 April 2009 17:31:59 Shachar Shemesh wrote: Go back to school, and as punishment re-implement quick_sort in VB.NET. Now that's going the "cruel and unusual" route. I do think every programmer should take the time to implement binary search and quick sort at least once from scratch. The number of corner cases there is outstanding, and it is a great practice of thinking of the fine details. Beeing a little serious: I am not sure quick_sort is a must, as quite frankly it's a reall mess and I don't understand it. Sounds like an excellent reason to go there. But heap sort and binary sort, yes. Those are a must. Heap sort is fairly straight forward once you have the heap. I do believe every programmer should know how to write a heap (preferably, a compressed one, where you keep no node pointers). Shachar -- Shachar Shemesh Lingnu Open Source Consulting Ltd. http://www.lingnu.com ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
