U++ forum: Welcome to the forum

Re: <<= and << [message #12957 is a reply to message #7187]

Fri, 30 November 2007 13:13

waxblood
Messages: 95
Registered: January 2007

Member

Quote:

<<= sets the WhenAction callback

<< adds a new callback to existing one; if there were any callbacks before assigned, they will be called as well.

In fact, "<<" is sort of experiment and is very rarely used

Reading code snippets in documentation '<<=' is always used instead of <<, but isn't the '<<' behaviour much more natural than the first one? Writing code with '<<' allows the programmer to modify callbacks stack of ancestor classes freely being at least a little more confident that those callbacks will always be executed before any one other callbacks in derived classes.
Using always '<<=' precludes this possibility.

I think it would be useful to develop plugin-oriented programs, too.

I'm wondering, given the fact quite nobody uses the '<<' form, would it be possible to convert the '<<=' behaviour to '<<'?

David

Report message to a moderator