Re: C++: Problem with overloading a constructor when splitting a
> > > On Sun, 18 Nov 2001, Shaul Karl wrote: > > > > you have put an inline function inside a '.cc' file. since it is inline, > > > it will NOT be included in the object file 'base.cc', and thus, during > > > link, there base constructor will be undefined. this is your bug - not > > > g++'s. > > > > > > fixes: > > > > > > 1. move the inline function into the header file. > > > 2. make the function not 'inline'. > > > > Are there no other options? In particular, one that is both inline and > > with split files? (inline for speed and splitting the src for > > readability) > > by definition - no. you split source - you can't do inline. inline works > if you put it in the header file. that's the idea of inline - copying the > code to all other sources, rather then having a real function in the > resulting object file. > This may seem an ugly feature of C++, but in fact it is better than the C counterpart - macros. In fact, writing the implementation of inline functions in header file is a beautiful gem, comparing to writing the implemetation of calss templates in header files. Yuck. Dan. = To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: C++: Problem with overloading a constructor when splitting a
On Sun, 18 Nov 2001, Dan Kenigsberg wrote: > This may seem an ugly feature of C++, but in fact it is better than the C > counterpart - macros. In fact, writing the implementation of inline functions > in header file is a beautiful gem, comparing to writing the implemetation of > calss templates in header files. Yuck. actually, writing the implementation of class templates in header files is *not* a language feature, it's a limitation of current (?) compiler technology, which can not handle templates being split up in different compilation units. [ i would supply more details, but couldnt find any references on google. if anyone can shed more light, please do. ] -- mulix http://www.pointer.co.il/~mulix/ http://syscalltrack.sf.net/ = To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: C++: Problem with overloading a constructor when splitting a
Dan Kenigsberg <[EMAIL PROTECTED]> writes: > This may seem an ugly feature of C++, but in fact it is better than > the C counterpart - macros. Inlined functions are supposed to be a standard C feature in C99. GCC has had them for years. > In fact, writing the implementation of inline functions in header > file is a beautiful gem, comparing to writing the implemetation of > calss templates in header files. Yuck. Well, don't blame C for that. Yuck, indeed - breaks modularizations etc. -- Oleg Goldshmidt | [EMAIL PROTECTED] "If it ain't broken, it has not got enough features yet." = To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: C++: Problem with overloading a constructor when splitting a
See discussion on export keyword, p. 205 in The C++ Programming Language (3rd edn.), Stroustrup. It should do the job, but I don't know in GNU c++ implements it. mulix wrote: > On Sun, 18 Nov 2001, Dan Kenigsberg wrote: > > >>This may seem an ugly feature of C++, but in fact it is better than the C >>counterpart - macros. In fact, writing the implementation of inline functions >>in header file is a beautiful gem, comparing to writing the implemetation of >>calss templates in header files. Yuck. >> > > actually, writing the implementation of class templates in header files > is *not* a language feature, it's a limitation of current (?) compiler > technology, which can not handle templates being split up in different > compilation units. > > [ i would supply more details, but couldnt find any references on > google. if anyone can shed more light, please do. ] > = To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: C++: Problem with overloading a constructor when splitting a
Daniel Feiglin <[EMAIL PROTECTED]> writes: > See discussion on export keyword, p. 205 in The C++ Programming > Language (3rd edn.), Stroustrup. It should do the job, but I don't > know in GNU c++ implements it. No. You get warning: keyword 'export' not implemented and will be ignored with gcc 2.96. I don't know about gcc 3.* - have not tried it yet. -- Oleg Goldshmidt | [EMAIL PROTECTED] "If it ain't broken, it has not got enough features yet." = To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
C++: Problem with overloading a constructor when splitting a src file.
Part 1: this works as expected
--
[01:27:40 tmp]$ cat main.cc
#include
#include
using namespace std;
class base
{
public:
base();
base(string &str);
};
class derived : public base
{
public:
derived(string &str) : base(str) {}
};
inline base::base() {}
inline base::base(string &str)
{
cout << str << endl;
}
int main(void)
{
string str("test succeeded.");
derived testingDerived(str);
}
[01:27:45 tmp]$ g++-3.0 -Wall -o main main.cc
main.cc: In function `int main()':
main.cc:30: warning: unused variable `derived testingDerived'
[01:29:10 tmp]$
Part 2: Why this does not work?
---
Next I have tried to split this into 3 files:
[01:19:08 tmp]$ more *.h *.cc
::
header.h
::
#include
#include
using namespace std;
class base
{
public:
base();
base(string &str);
};
class derived : public base
{
public:
derived(string &str) : base(str) {}
};
::
base.cc
::
#include "header.h"
inline base::base() {}
inline base::base(string &str)
{
cout << str << endl;
}
::
main.cc
::
#include "header.h"
int main(void)
{
string str("test succeeded.");
derived testingDerived(str);
}
[01:19:40 tmp]$ for f in *.cc; do C="g++-3.0 -Wall -c -o ${f%.*}.o $f";
echo $C;$($C); done; C="g++-3.0 -Wall -o main main.o base.o"; echo $C;
$($C);
g++-3.0 -Wall -c -o base.o base.cc
g++-3.0 -Wall -c -o main.o main.cc
main.cc: In function `int main()':
main.cc:6: warning: unused variable `derived testingDerived'
g++-3.0 -Wall -o main main.o base.o
main.o: In function `derived::derived(std::string&)':
main.o(.gnu.linkonce.t._ZN7derivedC1ERSs+0x10): undefined reference to
`base::base(std::string&)'
collect2: ld returned 1 exit status
[01:20:53 tmp]$
Why it does not work?
Is this reproducible with other distros or g++ versions?
[01:20:53 tmp]$ g++-3.0 -v
Reading specs from /usr/lib/gcc-lib/i386-linux/3.0.2/specs
Configured with: ../src/configure -v --enable-languages=c,c++,java,f77,p
roto,objc --prefix=/usr --infodir=/share/info --mandir=/share/man
--enable-shared --with-gnu-as --with-gnu-ld --with-system-zlib
--enable-long-long --enable-nls --without-included-gettext
--disable-checking --enable-threads=posix --enable-java-gc=boehm
--with-cpp-install-dir=bin --enable-objc-gc i386-linux
Thread model: posix
gcc version 3.0.2 20010922 (Debian prerelease)
[01:23:23 tmp]$
--
Shaul Karl
email: shaulka (replace these parenthesis with @) bezeqint,
delete the comma and the white space characters and add .net
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To unsubscribe, send mail to [EMAIL PROTECTED] with
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Re: C++: Problem with overloading a constructor when splitting a src file.
you have put an inline function inside a '.cc' file. since it is inline,
it will NOT be included in the object file 'base.cc', and thus, during
link, there base constructor will be undefined. this is your bug - not
g++'s.
fixes:
1. move the inline function into the header file.
2. make the function not 'inline'.
guy
On Sun, 18 Nov 2001, Shaul Karl wrote:
> Date: Sun, 18 Nov 2001 01:38:10 +0200
> From: Shaul Karl <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: C++: Problem with overloading a constructor when splitting a
> src file.
>
> Part 1: this works as expected
> --
>
> [01:27:40 tmp]$ cat main.cc
> #include
> #include
>
> using namespace std;
>
> class base
> {
> public:
> base();
> base(string &str);
> };
>
> class derived : public base
> {
> public:
> derived(string &str) : base(str) {}
> };
>
> inline base::base() {}
>
> inline base::base(string &str)
> {
> cout << str << endl;
> }
>
>
> int main(void)
> {
> string str("test succeeded.");
> derived testingDerived(str);
> }
>
> [01:27:45 tmp]$ g++-3.0 -Wall -o main main.cc
> main.cc: In function `int main()':
> main.cc:30: warning: unused variable `derived testingDerived'
> [01:29:10 tmp]$
>
>
>
> Part 2: Why this does not work?
> ---
>
> Next I have tried to split this into 3 files:
>
> [01:19:08 tmp]$ more *.h *.cc
> ::
> header.h
> ::
> #include
> #include
>
> using namespace std;
>
> class base
> {
> public:
> base();
> base(string &str);
> };
>
> class derived : public base
> {
> public:
> derived(string &str) : base(str) {}
> };
> ::
> base.cc
> ::
> #include "header.h"
>
> inline base::base() {}
>
> inline base::base(string &str)
> {
> cout << str << endl;
> }
> ::
> main.cc
> ::
> #include "header.h"
>
> int main(void)
> {
> string str("test succeeded.");
> derived testingDerived(str);
> }
>
>
> [01:19:40 tmp]$ for f in *.cc; do C="g++-3.0 -Wall -c -o ${f%.*}.o $f";
> echo $C;$($C); done; C="g++-3.0 -Wall -o main main.o base.o"; echo $C;
> $($C);
> g++-3.0 -Wall -c -o base.o base.cc
> g++-3.0 -Wall -c -o main.o main.cc
> main.cc: In function `int main()':
> main.cc:6: warning: unused variable `derived testingDerived'
> g++-3.0 -Wall -o main main.o base.o
> main.o: In function `derived::derived(std::string&)':
> main.o(.gnu.linkonce.t._ZN7derivedC1ERSs+0x10): undefined reference to
> `base::base(std::string&)'
> collect2: ld returned 1 exit status
> [01:20:53 tmp]$
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Re: C++: Problem with overloading a constructor when splitting a src file.
>
> you have put an inline function inside a '.cc' file. since it is inline,
> it will NOT be included in the object file 'base.cc', and thus, during
> link, there base constructor will be undefined. this is your bug - not
> g++'s.
>
> fixes:
>
> 1. move the inline function into the header file.
> 2. make the function not 'inline'.
>
> guy
>
Are there no other options? In particular, one that is both inline and
with split files? (inline for speed and splitting the src for
readability)
> On Sun, 18 Nov 2001, Shaul Karl wrote:
>
> > Date: Sun, 18 Nov 2001 01:38:10 +0200
> > From: Shaul Karl <[EMAIL PROTECTED]>
> > To: [EMAIL PROTECTED]
> > Subject: C++: Problem with overloading a constructor when splitting a
> > src file.
> >
> > Part 1: this works as expected
> > --
> >
> > [01:27:40 tmp]$ cat main.cc
> > #include
> > #include
> >
> > using namespace std;
> >
> > class base
> > {
> > public:
> > base();
> > base(string &str);
> > };
> >
> > class derived : public base
> > {
> > public:
> > derived(string &str) : base(str) {}
> > };
> >
> > inline base::base() {}
> >
> > inline base::base(string &str)
> > {
> > cout << str << endl;
> > }
> >
> >
> > int main(void)
> > {
> > string str("test succeeded.");
> > derived testingDerived(str);
> > }
> >
> > [01:27:45 tmp]$ g++-3.0 -Wall -o main main.cc
> > main.cc: In function `int main()':
> > main.cc:30: warning: unused variable `derived testingDerived'
> > [01:29:10 tmp]$
> >
> >
> >
> > Part 2: Why this does not work?
> > ---
> >
> > Next I have tried to split this into 3 files:
> >
> > [01:19:08 tmp]$ more *.h *.cc
> > ::
> > header.h
> > ::
> > #include
> > #include
> >
> > using namespace std;
> >
> > class base
> > {
> > public:
> > base();
> > base(string &str);
> > };
> >
> > class derived : public base
> > {
> > public:
> > derived(string &str) : base(str) {}
> > };
> > ::
> > base.cc
> > ::
> > #include "header.h"
> >
> > inline base::base() {}
> >
> > inline base::base(string &str)
> > {
> > cout << str << endl;
> > }
> > ::
> > main.cc
> > ::
> > #include "header.h"
> >
> > int main(void)
> > {
> > string str("test succeeded.");
> > derived testingDerived(str);
> > }
> >
> >
> > [01:19:40 tmp]$ for f in *.cc; do C="g++-3.0 -Wall -c -o ${f%.*}.o $f";
> > echo $C;$($C); done; C="g++-3.0 -Wall -o main main.o base.o"; echo $C;
> > $($C);
> > g++-3.0 -Wall -c -o base.o base.cc
> > g++-3.0 -Wall -c -o main.o main.cc
> > main.cc: In function `int main()':
> > main.cc:6: warning: unused variable `derived testingDerived'
> > g++-3.0 -Wall -o main main.o base.o
> > main.o: In function `derived::derived(std::string&)':
> > main.o(.gnu.linkonce.t._ZN7derivedC1ERSs+0x10): undefined reference to
> > `base::base(std::string&)'
> > collect2: ld returned 1 exit status
> > [01:20:53 tmp]$
>
--
Shaul Karl
email: shaulka (replace these parenthesis with @) bezeqint,
delete the comma and the white space characters and add .net
=
To unsubscribe, send mail to [EMAIL PROTECTED] with
the word "unsubscribe" in the message body, e.g., run the command
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