On Friday 07 December 2007, Gregory Beaver wrote:
> > If new, future core extensions showed up in a reserved PHP::
> > namespace, you would be >:-).
>
> Exactly - which is why you should never put classes, functions or
> constants in the __php__ namespace. The convention I am proposing is to
> only use __php__ for code that *uses* re-usable components, not
> *declares* them. In this case, your example would be revised as:
>
> <?php
> namespace Mylib;
> class Date {}
> ?>
>
> <?php
> namespace __php__;
> use Mylib::Date;
> include 'autoload.php'; // note - require_once and () just slow things down
> $a = new Date();
> ?>
>
> This convention serves two purposes
>
> 1) library code is always explicitly "use"d
> 2) name conflicts are impossible
>
> The suggestion to make "namespace __php__;" implicit is very
> interesting, but would defeat its purpose, which is to separate
> declarations from use.
>
> Another off-list suggestion was to make "use" outside of a namespace
> declaration an error, as this is generally a bad idea that can lead to
> many "gotchas".
>
> Greg
Doesn't strict C++ also have a requirement for a global namespace definition?
It has been a very long time since I did any C++, but I seem to recall a
requirement for a "use std" or something like that directive that I never
actually understood. :-)
If there is a "named global namespace" __php__, then requiring it in order to
import anything makes sense. It's one extra line of code and doesn't break
BC anymore than using the use keyword does.
Another observation, if one takes the position that library code and "running
code" should always be separated, this setup would encourage that "best
practice" but does not absolutely require it. That fits with the "doing
something dumb should be hard, but not impossible" philosophy. :-) That
recommendation would definitely need to be well-documented.
I overall like this concept. Kudos to Greg, as others have said. One
question I would have is what is the performance hit of braces over a
keyword? (Not a challenge; I genuinely don't know what the C implementation
differences would be that would make a difference.)
--
Larry Garfield AIM: LOLG42
[EMAIL PROTECTED] ICQ: 6817012
"If nature has made any one thing less susceptible than all others of
exclusive property, it is the action of the thinking power called an idea,
which an individual may exclusively possess as long as he keeps it to
himself; but the moment it is divulged, it forces itself into the possession
of every one, and the receiver cannot dispossess himself of it." -- Thomas
Jefferson
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