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

Subject: Re: [Boost-users] boost and std collisons in c++0x
From: Mickael Wolff (mickael_at_[hidden])
Date: 2009-02-05 13:04:14

Ein Held a écrit :

> As of now, we move both, ::boost- and ::std-namesspace in the global 
> namespace via using xxx. This is exactly what we want - boost and the 
> stl are both such fundamental libraries that using an explicit namespace 
> specifier everytime we want to use content of these namespaces is not 
> accaptable. This would just blow the code and make it unreadable.

   This is very funny. In fr.comp.lang.c++, we had a troll about using 
usage. It appears that a lot of contributor use qualified names in 
professionnal code, to avoid namespaces collision and improve readness. 
Because when we use a string, I can need to know where it come from. 
That's an example.
   The second point we raised is the bad habit of beginners, who 
massively use the using namespace directive at global scope, and worst 
in header's global scope !

   Daniel Lidström provided a good way to assure a consistent use of 
tools that comes from differents libraries. He imports objects and 
functions he need in a project specific namespace. This is a very soft 
approach, because you can support evolution and migrations more easily, 
at the cost of basics macros.

> #include <iostream> //This one might include <array>
> using namespace std;

   Bad, very bad.
   Be aware that namespace encapsulation have no interest if you cancel it.
-- 
Mickaël Wolff aka Lupus Michaelis
Racine <http://lupusmic.org>
Blog   <http://blog.lupusmic.org>