Re: about @selector
Re: about @selector
- Subject: Re: about @selector
- From: Ondra Cada <email@hidden>
- Date: Sat, 11 May 2002 00:48:26 +0200
On Friday, May 10, 2002, at 12:08 , nicolas berloquin wrote:
there is something I understood with aaron's book, and that's quite
different from c++: you can call
methods dynamically. That is, you could have the user enter a string, say
"mymethod:", then get this
string, and call the function by creating a selector with the string
@selector(mystring) (or something close
to that).
Well, close:
[obj performSelector:NSSelectorFromString(theString) ...];
The @selector is a compiler directive, ie. a compile-time (actually
link-time) constant. Therefore, it can't be used over dynamic string.
That's very efficient and cool when you want to have dynamic plugins etc
etc, something more difficult
to do in c++...
Actually it is plain impossible in C++. You can rig up tricks to go close,
but the more flexibility you get, the less C++ the result is. As soon as
you get the full ObjC-like flexibility, you have just implemented an ObjC
runtime in C++ ;)))
---
Ondra Cada
OCSoftware: email@hidden
http://www.ocs.cz
2K Development: email@hidden
http://www.2kdevelopment.cz
private email@hidden
http://www.ocs.cz/oc
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