Re: [Dev-C++] Using Namespaces

[Hielke <hie...@he...>]

AFAIK there is no way you could safely use usingstatements in your
header files. So AVOID it (As you did mention by yourself it is not very
kind to force users of your code to use namespaces they did not declare
themselves)!  Just try to be a somewhat less lazier :o).
However there are neat ways using those in your member implementations.
Personally I'd like to use internal header files for that purpose.
Including an 'in-between-headerfile' from your source code which
includes the actual classdefinition headerfile. My code organization
then looks as follows:

// member1.cc
#include "classa.ih"   // include internal header, note the "i"

void Member1()
{
}

// classa.ih
#include "classa.h"   // include actual definition header

/* Includes, namespacedeclarations, etc. for your sourcefiles here*/
using namespace blabla;

// classa.h
#ifndef _CLASSA_H_
#define _CLASSA_H_

class A
{
    ...
    void Member1();
};

#endif

This approach however has one big disadvantage. In IDE's such as Dev-CPP
you have to include those files in the linking process manually since
Dev-CPP doesn't recognize the ".ih" (or whatever you'd like to use for
internal headers) extension.

Regards,
    Hielke


Siva Chandra wrote:

>hello all,
>
>I have a question on using namespaces. Say I want to
>build a class ClassA and put it in a namespace abc.
>Then I would declare the class in a header file,
>header1.h, like:
>
>#ifndef __HEADER1_H__
>#define __HEADER1_H__
>
>namespace abc
>{ // Start of namespace brace.
>
>class ClassA
>{
>...
>};
>
>} // End of namespace brace.
>
>#endif // __HEADER1_H__
>
>Now I would like to include this header file in
>another header file, header2.h. Here again I want to
>declare a class ClassB under the same namespace abc.
>This ClassB is inherited from ClassA. So to avoid
>writing abc::ClassA everywhere I just say:
>
>using namespace abc;
>
>at the begining of the file. My file would be like:
>
>#ifndef __HEADER2_H__
>#define __HEADER2_H__
>
>#include "header1.h"
>
>using namespace abc;
>
>namespace abc
>{ // Start of namespace brace.
>
>class ClassB : public ClassA
>{
>...
>};
>
>} // End of namespace brace.
>
>#endif // __HEADER2_H__
>
>My question is here: By explicitly putting a statement
>like
>
>using namespace abc;
>
>I am including such a statement in all my code which
>use this header file header2.h. Is there a way to
>avoid such a thing from happening without losing the
>functionality I want it to be there for? Or is it that
>I am not using it in the right manner?
>
>Thanks a lot for having enough patience to read this
>long,
>
>Siva Chandra.
>
>
>
>		
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