Re: [boost] Proposal for improved versions of some std function objects

From: Matthias Troyer (troyer_at_[hidden])
Date: 2003-05-08 14:00:12

On Thursday, May 8, 2003, at 10:12 AM, Kresimir Fresl wrote:

>
> Matthias Troyer wrote:
>
>> That's a good point. I have prepared a version separate from 
>> functional.hpp and posted it on our web server:
>
>> http://www.comp-phys.org/software/function_objects/
>
> Shouldn't the default type of the result of `logical_and'
> and `logical_or' be `bool' and not `Arg1'?

Yes, that's a good point as std::logical_and as std::logical_or also 
have bool as return type
>
> I think that even for user defined types overloaded
> operators && and || will usually return boolean values.

except for container types such as std::valarray, where an operator&& 
or operator|| might return a std::valarray<bool>.

However in order to keep consistency with the standard when only one 
template argument is given, I agree that a default value of bool is 
better.

Matthias