Moving C++ bindings in gmpxx.h into a namespace

[Sam Varshavchik]

Marc Glisse writes:

> On Sat, 29 Jun 2013, Sam Varshavchik wrote:
>
>> Is there any interest in moving all the C++ bindings into their own  
>> namespace, say gnu::mp?
>
> Vaguely. Preferably at the same time as some other ABI-breaking changes.
>
>> This is popular with many C++ dev libraries, like boost, for example.
>> There are several advantages with doing that; mainly reducing the risk of  
>> clashing with application's own symbols, or even with symbols from other  
>> libraries that an app also links to.
>
> The risk of clashing is very low. We currently use the old C namespacing  
> technique of giving all names an application-specific prefix (plus we  
> illegally put most names in the implementation namespace). Did you hit a  
> particular issue or are you just suggesting it because it sounds good?

I was pondering including gmp internally as part of another C++ library,  
that has its own vanity namespace; where I follow the principle of not  
adding its symbols to the global namespace; I think that should be entirely  
for client apps, so I like not to meddle therer.

>> Or, for 100% source backwards compatibility, rename gmpxx.h to something  
>> else, and have it declare everything in gnu::mp, and replace gmpxx.h with a  
>> stub that includes the real file, and provides the three typedefs.
>
> I'd probably import the names to the global namespace by default anyway, so  
> no point complicating things too much.

That'll work too; as long as it's possible to avoid that, and possible to  
import only the library-specific namespace.

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