Re: [Boost-users] Why not overloading && and || in bind?

From: dizzy (dizzy_at_[hidden])
Date: 2008-02-15 11:40:03

Hello

On Friday 15 February 2008 18:24:26 Michael Fawcett wrote:
> Are you saying that short-circuit evaluation doesn't happen here, i.e.
> the second(t) call happens no matter what?

At the time of safe_and or safe_or construction both expressions are evaluated 
and I didn't thought of it more (like using bind and such in your code).

> 	emp_container::const_iterator e = find_if(staff.begin(), staff.end(),
> 		safe_logical_and(safe_logical_or(bind(&employee::name, _1) ==
> "Paula", bind(&employee::name, _1) == "John"),

With this kind of usage it is probably fine as bind (and the lambda operator== 
which I assume it is used in that expression) delays the actual evaluation of 
the expression (ie of "name" member being equal to some value) until later 
when you invoke it in your or_/and_ functors. Thanks for taking your time to 
explain this, I did not understood it from your previous email.

-- 
Mihai RUSU					Email: dizzy_at_[hidden]
			"Linux is obsolete" -- AST