Re: [Boost-users] boost and std collisons in c++0x

Subject: Re: [Boost-users] boost and std collisons in c++0x
From: Sergey Sadovnikov (flex_ferrum_at_[hidden])
Date: 2009-02-06 04:22:14

Hello, dariomt.

Friday, February 6, 2009 at 1:02:30 AM Michael Fawcett wrote:

>> I mean what you can use unqualified ids and usings in most cases
>> without any errors from the compilator _when you use only standard
>> facilities_.

MF> True, but same with C++.  If you are only using std namespace, you
MF> have no problems.  It's only when you bring multiple namespaces into
MF> the same scope. e.g. System + XNA, or std + boost.
But I see some significant difference. Both std and boost are standard
libraries for most C++ programmers. One 'de-jure' and another
'de-facto'. In the near future both STL and boost will contain similar
set of most-useful entities. Unlike System and XNA.

Friday, February 6, 2009 at 11:46:12 AM dariomt wrote:

d> Sergey Sadovnikov <flex_ferrum <at> artberg.ru> writes:

d> What about scoped using directive (or using declaration)?

d> { // begin code using namespaces

d>    using namespace std;
d>    using namespace std::placeholders;
d>    vector<shared_ptr<SomeClass>> vec;
d>    for_each(vec.begin(), vec.end(),
d> bind(&shared_ptr<SomeClass>::get, _1,
d> bind(&SomeClass::foo, _1, 10)));

d> } // end code using namespaces

d> Explicit, readable, and doesn't affect code outside the braces
Just add 'using namespace boost' in this scope for some manner, and you could return
to the previous problem:

{ // begin code using namespaces

   using namespace std;
   using namespace std::placeholders;
   using namespace boost;
   std::vector<string> path_parts;
   split(vec, "/1/2/3/4", is_any_of("\\/") ); // string splitter from string algo
   for_each(path_parts.begin(), path_parts.end(), bind(&SomeClass::RegisterPathPart, _1)); // do something with string parts

} // end code using namespaces

-- 
Best Regards,
 Sergey                          mailto:flex_ferrum_at_[hidden]