[boost] Re: N-arity operators in C++, also reducing temporaries. [Repost]

From: Pavel Chikulaev (pavel.chikulaev_at_[hidden])
Date: 2005-03-09 07:56:17

"Tobias Schwinger" <tschwinger_at_[hidden]> wrote in message 
news:d0k5m1$4cp$1_at_sea.gmane.org...
> That's the special case where all elements are used.
>
> I use 'apply', 'apply_one' and 'apply_but' functions that allow me to 
> apply functors to all elements, one element and all but one elements, 
> respectively (I use different versions for both static and dynamic indices 
> and both static and dynamic functors):
>
>   // Create an expression inverting the first element
>   // of my_vector (using Boost.Lambda)
>   apply_one<0> (my_vector, - _1)
>
> Further the result type may not always be the same as the argument type:
>
>   vector_slice<0,3> (my_quaternion) = direction * std::sin(a*half);

I'm not sure such library needs 'apply', 'apply_one', 'apply_but'.
User of my library will add them easily by himself if he really needs it, 
but
in most case I don't think he is.

--
Pavel Chikulaev