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| How to manage UPP namespace [message #43084] |
Sat, 03 May 2014 23:22  |
Didier
Messages: 726
Registered: November 2008
Location: France
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Contributor |
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This is a problem on which I stumble regularly.
Some packages are inside UPP namespace, some have they're own namespace, some don't have any namespace at all and some have 'using namespace Upp;' in they're headers !!
This leads to name clashes and ambiguous problems when using some packages or when including external resource code.
I think their should be some recommendations on how to correctly manage this (if you wan't you're package to be usable by others of coarse ), like the following:
- always put code inside namespace Upp ( at least for classes meant to be used by other packages )
- Never put 'using namespace xxx;' inside headers
[Updated on: Sat, 03 May 2014 23:24] Report message to a moderator |
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| Re: How to manage UPP namespace [message #43085 is a reply to message #43084] |
Sun, 04 May 2014 07:56  |
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Hi Didier,
I agree that there should NEVER be "using namespace" in header that is meant to be used by others. I don't really care if some code is in Upp namespace and some in global, sometimes it is hard to tell whether it is really part of U++, e.g. for packages in bazaar, it is kind of blurry line.
Another related thing related to namespaces that I would like to point out is the existence of NONAMESPACE flag. It can be used to move all U++ code to global namespace, which might be preferable for someone who doesn't like to deal with "using namespace Upp;" in every file. But for this flag to work, all the code must use correct macros, defined in Core.h:#ifdef flagNONAMESPACE
#define NAMESPACE_UPP
#define END_UPP_NAMESPACE
#define UPP
#else
#define NAMESPACE_UPP namespace Upp {
#define END_UPP_NAMESPACE };
#define UPP Upp
#endif
There is a lot of code (some even in Core IIRC), that does not follow this convention, making NONAMESPACE flag useless.
Best regards,
Honza
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