llvm dev - Sep 2005 - [LLVMdev] name collision - llvm::tie and boost::tie

On Thursday 22 September 2005 19:12, Chris Lattner
wrote:
> On Thu, 22 Sep 2005, Tzu-Chien Chiu wrote:
> > On 22/09/05, Bill Wendling <isanbard at gmail.com> wrote:
> >> Couldn't you state the explicit namespaces. So not using
"using
> >> namespace llvm" and instead prefix all calls with
"llvm::"?
> >
> > The header files in boost do not use fully-qualified tie(). I probably
> > should not modify them. But my .cpp file #include them.
>
> That should be fine if they are in a namespace boost {}.
>
> > I hope I could "using namespace"  boost and llvm in .cpp
file, because
> > it's tedious to use fully-qualified identifiers in boost and llvm
> > namespace.
>
> Add:
>
> using boost::somethingyoucareabout;
> using boost::somethingelseyoucareabout;
> using namespace llvm;
>
> Or whatever you prefer.  This way you only import the symbols you want.
In fact, I believe that

   using namespace llvm;
   using namespace boost;
   using boost::tie;

should resove the problem witout needed to explicitly nominate all boost names 
you use. Except that this does not work on global scope, but only in 
namespace:

   namespace Tzu_Chien_Chiu
   {
           using namespace llvm;
           using namespace boost;
           using boost::tie;

		   void func() {  // Use 'tie'. }
   }

You can see "The C++ programming language", section C.10 for details.

- Volodya

On 9/23/05, Vladimir Prus <ghost at cs.msu.su>
wrote:
> In fact, I believe that
>
>    using namespace llvm;
>    using namespace boost;
>    using boost::tie;
>
> should resove the problem witout needed to explicitly nominate all boost
names
> you use. Except that this does not work on global scope, but only in
> namespace:
<SNIP>

Also, it might be an idea to exploit Koenig lookup if either `tie'
function is a free function and uses types from its own namespace.

If these definitions hold:

namespace foo {
   struct bar {};
   do_something(const bar&);
}

You can call do_something() without the namespace qualification due to
Koenig lookup.

(global namespace)
using foo::bar;
bar b;
do_something(b); // resolves to foo::do_something()

Maybe this helps.

Regards,
Andreas

--
"Give a man a fire and he's warm for a day; set him on fire and
he's
warm for the rest of his life" -- Terry Pratchett

On Friday 23 September 2005 11:07, Andreas Fredriksson
wrote:
> On 9/23/05, Vladimir Prus <ghost at cs.msu.su> wrote:
> > In fact, I believe that
> >
> >    using namespace llvm;
> >    using namespace boost;
> >    using boost::tie;
> >
> > should resove the problem witout needed to explicitly nominate all
boost
> > names you use. Except that this does not work on global scope, but
only
> > in namespace:
>
> <SNIP>
>
> Also, it might be an idea to exploit Koenig lookup if either `tie'
> function is a free function and uses types from its own namespace.
This is getting off-topic for this list, but ADL (aka. Koenig lookup) won't 
help with "tie", because 'tie' is mostly called on std::pair.

- Volodya