Re: [SCALUG] Re: c++ question

Re: [SCALUG] Re: c++ question

[Dockeen]

You can also qualify the name of the function when you use
it, i.e.

std::cout << "Wayne is a nitwit\n";

There are some coding standard you will run across from time
to time in some unused SDPs that will forbid to some degree
using "using"

Wayne

Re: [SCALUG] Re: c++ question

[John Burski]

Hoopla!!

Thanks for your help!  I can see that I've been away from my roots for 
too long :(

Incidentally, just for kicks I changed the "using namespace std;" phrase 
to "using std::cout;" and it worked well, too.

Thanks again!

Andrea 'fwyzard' Bocci wrote:

> At 11.18 26/12/2002 +0600, John Burski wrote:
>
>> My thanks to those who responded to my question -- I really 
>> appreciate the help.
>>
>> However, my problem still remains.
>>
>>
>> // cut here - hello.cc
>>
>> #include <iostream>
>> using namespace std;
>>
>> int main()
>> {
>>    cout << "Hello, World\n";
>> }
>> // cut here -eof
>
>
> // cut here - hello.cc
> hello: hello.o
>         g++ hello.o -o hello
>
> hello.o: hello.cc
>         g++ hello.cc -c -o hello.o
>
> // cut here -eof
>
> At the prompt:
> $ make
> g++ hello.cc -c -o hello.o
> g++ hello.o -o hello
>
> $ ./hello
> Hello, World
>
> So, it worke quite well for me.
> I think explicitly adding libgcc on the command line (which 
> incidentally is a  Bad Thing TM) screws up the librari dependancies.
> Don't do it.
> The same hold true for adding /usr/include/g++-3 to you include search 
> path. There's no need for it, it's done automatically and permanently 
> by the "make install" part of the GCC installation.
>
> HTH,
> fwyzard
>
> .
>

-- 
John Burski

@HOME S.I.M.U. (Well, sometimes I am :)  )

... and still searching for the cheese!

Re: [SCALUG] Re: c++ question

[Andrea 'fwyzard' Bocci]

At 11.18 26/12/2002 +0600, John Burski wrote:

>My thanks to those who responded to my question -- I really appreciate the 
>help.
>
>However, my problem still remains.
>
>
>// cut here - hello.cc
>
>#include <iostream>
>using namespace std;
>
>int main()
>{
>    cout << "Hello, World\n";
>}
>// cut here -eof

// cut here - hello.cc
hello: hello.o
         g++ hello.o -o hello

hello.o: hello.cc
         g++ hello.cc -c -o hello.o

// cut here -eof

At the prompt:
$ make
g++ hello.cc -c -o hello.o
g++ hello.o -o hello

$ ./hello
Hello, World

So, it worke quite well for me.
I think explicitly adding libgcc on the command line (which incidentally is 
a  Bad Thing TM) screws up the librari dependancies.
Don't do it.
The same hold true for adding /usr/include/g++-3 to you include search 
path. There's no need for it, it's done automatically and permanently by 
the "make install" part of the GCC installation.

HTH,
fwyzard 

Re: [SCALUG] Re: c++ question

[John Burski]

[-- Attachment #1: Type: text/plain, Size: 2299 bytes --]

My thanks to those who responded to my question -- I really appreciate 
the help.

However, my problem still remains.

Since I received multiple suggestions and I didn't want to discount any, 
I created two different source files, "hello0.cpp" and "hello1.cpp" 
(sources files are attached).  I then created "Makefile[123]" for 
compiling and linking "hello0.cpp" and "Makefile[456]" for compiling and 
linking "hello1.cpp" (files are attached).

I executed each "Makefile" in turn, the results of which are in the 
corresponding "make?.txt" files.

As you can see, when I used "namespace std" I still received results 
that seemed to indicate that the appropriate link library was not 
included.  When I used "std::cout" the results indicated that "cout" was 
not declared.

While I was writing this,  another thought occured to me, so I created 
"hello2.cpp" and "Makefile7", the results of which are in "make7.txt". 
 Still no joy.

I know I've got to be missing something, but I'm still at a loss for 
what it might be.

Thanks again.


LLeweLLyn Reese wrote:

>520075708323-0001@t-online.de (Alexander Helm) writes:
>
>  
>
>>Hi John,
>>
>>John Burski wrote:
>>    
>>
>>>[...]
>>>// File: hello.cpp
>>>#include <iostream>
>>>      
>>>
>>using namespace std;
>>    
>>
>
>Do you really want to bring in everything in namespace std? Like
>    'count' and 'y1'? I don't think so.
>
>using std::cout;
>
>will bring in only cout. It's better to use individual using statements.
>
>  
>
>>>int main() {
>>>   cout << "Hello, World\n";
>>>}
>>>[...]
>>>      
>>>
>>If you add the above line everything should do fine (alternativly you
>>can use std::cout instead of cout)
>>
>>    
>>
>>>[...]
>>>INCLUDE = /usr/include/g++-3
>>>LIBES = -lstdc++-3-libc6.2-2-2.10.0
>>>hello: hello.o
>>>	g++ -o hello hello.o $(LIBES)
>>>hello.o: hello.cpp
>>>	g++ -c -I$(INCLUDE) hello.cpp
>>>      
>>>
>>I would urge you not to include system-libraries this way, it makes
>>your source less portable.
>>
>>	CU
>>	Alexander
>>    
>>
>
>_______________________________________________
>scalug-list mailing list
>scalug-list@mn-linux.org
>https://mailman.real-time.com/mailman/listinfo/scalug-list
>
>.
>
>  
>

-- 
John Burski

@HOME S.I.M.U. (Well, sometimes I am :)  )

... and still searching for the cheese!



[-- Attachment #2: hello0.cpp --]
[-- Type: text/plain, Size: 107 bytes --]

// File: hello.cpp

#include <iostream>
using namespace std;

int main() 
{
   cout << "Hello, World\n";
}

[-- Attachment #3: hello1.cpp --]
[-- Type: text/plain, Size: 103 bytes --]

// File: hello.cpp

#include <iostream>
using std::cout;

int main() 
{
   cout << "Hello, World\n";
}

[-- Attachment #4: Makefile1 --]
[-- Type: text/plain, Size: 148 bytes --]

INCLUDE = /usr/include/g++-3
LIBES = -lgcc

hello0: hello0.o
	g++ -o hello0 hello0.o $(LIBES)

hello0.o: hello0.cpp
	g++ -c -I$(INCLUDE) hello0.cpp

[-- Attachment #5: Makefile2 --]
[-- Type: text/plain, Size: 151 bytes --]

INCLUDE = /usr/include/g++-3
LIBES = -lstdc++

hello0: hello0.o
	g++ -o hello0 hello0.o $(LIBES)

hello0.o: hello0.cpp
	g++ -c -I$(INCLUDE) hello0.cpp

[-- Attachment #6: Makefile3 --]
[-- Type: text/plain, Size: 157 bytes --]

INCLUDE = /usr/include/g++-3
LIBES = -lstdc++ -lgcc

hello0: hello0.o
	g++ -o hello0 hello0.o $(LIBES)

hello0.o: hello0.cpp
	g++ -c -I$(INCLUDE) hello0.cpp

[-- Attachment #7: Makefile4 --]
[-- Type: text/plain, Size: 148 bytes --]

INCLUDE = /usr/include/g++-3
LIBES = -lgcc

hello1: hello1.o
	g++ -o hello1 hello1.o $(LIBES)

hello1.o: hello1.cpp
	g++ -c -I$(INCLUDE) hello1.cpp

[-- Attachment #8: Makefile5 --]
[-- Type: text/plain, Size: 151 bytes --]

INCLUDE = /usr/include/g++-3
LIBES = -lstdc++

hello1: hello1.o
	g++ -o hello1 hello1.o $(LIBES)

hello1.o: hello1.cpp
	g++ -c -I$(INCLUDE) hello1.cpp

[-- Attachment #9: Makefile6 --]
[-- Type: text/plain, Size: 157 bytes --]

INCLUDE = /usr/include/g++-3
LIBES = -lstdc++ -lgcc

hello1: hello1.o
	g++ -o hello1 hello1.o $(LIBES)

hello1.o: hello1.cpp
	g++ -c -I$(INCLUDE) hello1.cpp

[-- Attachment #10: make1.txt --]
[-- Type: text/plain, Size: 3347 bytes --]

Script started on Thu Dec 26 09:18:00 2002
^[]0;jburski@natasha:~/toolkit/postgresql/c++\a

[jburski@natasha c++]$ 
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[jburski@natasha c++]$ make -
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[jburski@natasha c++]$ make -f
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[jburski@natasha c++]$ make -f Ma
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[jburski@natasha c++]$ make -f Mak
[jburski@natasha c++]$ make -f Mak
[jburski@natasha c++]$ make -f Make
[jburski@natasha c++]$ make -f Make
[jburski@natasha c++]$ make -f Makef
[jburski@natasha c++]$ make -f Makef
[jburski@natasha c++]$ make -f Makefi
[jburski@natasha c++]$ make -f Makefi
[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile1
[jburski@natasha c++]$ make -f Makefile1
g++ -o hello0 hello0.o -lgcc
hello0.o: In function `main':
hello0.o(.text+0x19): undefined reference to `cout'
hello0.o(.text+0x1e): undefined reference to `ostream::operator<<(char const*)'
collect2: ld returned 1 exit status
make: *** [hello0] Error 1
^[]0;jburski@natasha:~/toolkit/postgresql/c++\a

[jburski@natasha c++]$ 
[jburski@natasha c++]$ exit

Script done on Thu Dec 26 09:18:22 2002
Script started on Thu Dec 26 09:18:48 2002
^[]0;jburski@natasha:~/toolkit/postgresql/c++\a

[jburski@natasha c++]$ 
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[jburski@natasha c++]$ make -f Mak
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[jburski@natasha c++]$ make -f Makef
[jburski@natasha c++]$ make -f Makef
[jburski@natasha c++]$ make -f Makefi
[jburski@natasha c++]$ make -f Makefi
[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile1
[jburski@natasha c++]$ make -f Makefile1
g++ -c -I/usr/include/g++-3 hello0.cpp
g++ -o hello0 hello0.o -lgcc
hello0.o: In function `main':
hello0.o(.text+0x19): undefined reference to `cout'
hello0.o(.text+0x1e): undefined reference to `ostream::operator<<(char const*)'
collect2: ld returned 1 exit status
make: *** [hello0] Error 1
^[]0;jburski@natasha:~/toolkit/postgresql/c++\a

[jburski@natasha c++]$ 
[jburski@natasha c++]$ exit

Script done on Thu Dec 26 09:19:07 2002

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Script started on Thu Dec 26 09:19:29 2002
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[jburski@natasha c++]$ make -f Make
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[jburski@natasha c++]$ make -f Makef
[jburski@natasha c++]$ make -f Makef
[jburski@natasha c++]$ make -f Makefi
[jburski@natasha c++]$ make -f Makefi
[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile2
[jburski@natasha c++]$ make -f Makefile2
g++ -c -I/usr/include/g++-3 hello0.cpp
g++ -o hello0 hello0.o -lstdc++
hello0.o: In function `main':
hello0.o(.text+0x19): undefined reference to `cout'
hello0.o(.text+0x1e): undefined reference to `ostream::operator<<(char const*)'
collect2: ld returned 1 exit status
make: *** [hello0] Error 1
^[]0;jburski@natasha:~/toolkit/postgresql/c++\a

[jburski@natasha c++]$ 
[jburski@natasha c++]$ exit

Script done on Thu Dec 26 09:19:45 2002

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[jburski@natasha c++]$ ^[[K
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[jburski@natasha c++]$ make -f Mak
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[jburski@natasha c++]$ make -f Makef
[jburski@natasha c++]$ make -f Makefi
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[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile3
[jburski@natasha c++]$ make -f Makefile3
g++ -c -I/usr/include/g++-3 hello0.cpp
g++ -o hello0 hello0.o -lstdc++ -lgcc
hello0.o: In function `main':
hello0.o(.text+0x19): undefined reference to `cout'
hello0.o(.text+0x1e): undefined reference to `ostream::operator<<(char const*)'
collect2: ld returned 1 exit status
make: *** [hello0] Error 1
^[]0;jburski@natasha:~/toolkit/postgresql/c++\a

[jburski@natasha c++]$ 
[jburski@natasha c++]$ exit

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Script started on Thu Dec 26 09:21:30 2002
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[jburski@natasha c++]$ make -f Makefi
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[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile4
[jburski@natasha c++]$ make -f Makefile4
g++ -c -I/usr/include/g++-3 hello1.cpp
hello1.cpp:4: `cout' not declared
make: *** [hello1.o] Error 1
^[]0;jburski@natasha:~/toolkit/postgresql/c++\a

[jburski@natasha c++]$ 
[jburski@natasha c++]$ exit

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[jburski@natasha c++]$ make -f Makef
[jburski@natasha c++]$ make -f Makef
[jburski@natasha c++]$ make -f Makefi
[jburski@natasha c++]$ make -f Makefi
[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile5
[jburski@natasha c++]$ make -f Makefile5
g++ -c -I/usr/include/g++-3 hello1.cpp
hello1.cpp:4: `cout' not declared
make: *** [hello1.o] Error 1
^[]0;jburski@natasha:~/toolkit/postgresql/c++\a

[jburski@natasha c++]$ 
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Script started on Thu Dec 26 09:24:37 2002
^[]0;jburski@natasha:~/toolkit/postgresql/c++\a

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[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile6
[jburski@natasha c++]$ make -f Makefile6
g++ -c -I/usr/include/g++-3 hello1.cpp
hello1.cpp:4: `cout' not declared
make: *** [hello1.o] Error 1
^[]0;jburski@natasha:~/toolkit/postgresql/c++\a

[jburski@natasha c++]$ 
[jburski@natasha c++]$ exit

Script done on Thu Dec 26 09:24:46 2002

[-- Attachment #16: hello2.cpp --]
[-- Type: text/plain, Size: 91 bytes --]

// File: hello.cpp

#include <iostream>

int main() 
{
   std::cout << "Hello, World\n";
}

[-- Attachment #17: Makefile7 --]
[-- Type: text/plain, Size: 157 bytes --]

INCLUDE = /usr/include/g++-3
LIBES = -lstdc++ -lgcc

hello2: hello2.o
	g++ -o hello2 hello2.o $(LIBES)

hello2.o: hello2.cpp
	g++ -c -I$(INCLUDE) hello2.cpp

[-- Attachment #18: make7.txt --]
[-- Type: text/plain, Size: 1557 bytes --]

Script started on Thu Dec 26 09:45:30 2002
^[]0;jburski@natasha:~/toolkit/postgresql/c++\a

[jburski@natasha c++]$ 
[jburski@natasha c++]$ 
[jburski@natasha c++]$ m
[jburski@natasha c++]$ m
[jburski@natasha c++]$ ma
[jburski@natasha c++]$ ma
[jburski@natasha c++]$ mak
[jburski@natasha c++]$ mak
[jburski@natasha c++]$ make
[jburski@natasha c++]$ make
[jburski@natasha c++]$ make 
[jburski@natasha c++]$ make 
[jburski@natasha c++]$ make -
[jburski@natasha c++]$ make -
[jburski@natasha c++]$ make -f
[jburski@natasha c++]$ make -f
[jburski@natasha c++]$ make -f 
[jburski@natasha c++]$ make -f 
[jburski@natasha c++]$ make -f M
[jburski@natasha c++]$ make -f M
[jburski@natasha c++]$ make -f Ma
[jburski@natasha c++]$ make -f Ma
[jburski@natasha c++]$ make -f Mak
[jburski@natasha c++]$ make -f Mak
[jburski@natasha c++]$ make -f Make
[jburski@natasha c++]$ make -f Make
[jburski@natasha c++]$ make -f Makef
[jburski@natasha c++]$ make -f Makef
[jburski@natasha c++]$ make -f Makefi
[jburski@natasha c++]$ make -f Makefi
[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefil
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile
[jburski@natasha c++]$ make -f Makefile7
[jburski@natasha c++]$ make -f Makefile7
g++ -c -I/usr/include/g++-3 hello2.cpp
hello2.cpp: In function `int main()':
hello2.cpp:7: `cout' undeclared in namespace `std'
make: *** [hello2.o] Error 1
^[]0;jburski@natasha:~/toolkit/postgresql/c++\a

[jburski@natasha c++]$ 
[jburski@natasha c++]$ exit

Script done on Thu Dec 26 09:45:40 2002