Re: [boost] [constrained_types] Use cases survey

From: Neal Becker (ndbecker2_at_[hidden])
Date: 2006-01-18 08:47:20

Robert Kawulak wrote:

> Hi,
> 
>   Some time ago there was a discussion on the Constrained Types
> library. Unfortunately other duties didn't let me work on it for
> a long time (I apologise for this long break), but recently I
> started the work again. As a reminder, or short description for
> those who missed the discussion, there's a brief summary of usage
> of the library at the end of this message.
> 
>   I need help in determining the most common use cases of the
> library. Therefore I ask anybody who ever needed such a facility
> to write what exactly he needed it for, what were his
> expectations and requirements for functionality and efficiency.
> In particular, answers for the following questions would be
> useful (but all opinions and suggestions are valuable):
> 
> - Is it worth to make different implementation of
> increment/decrement functions for integer types to make them much
> more efficient than the generic versions? This needs complicating
> the design a little bit (but not the usage). OTOH only ++/--
> would be optimised, other operators not. So is ++/-- operation
> actually more common than the others that it's worth it?
> 

No.

> - Is such a feature likely to be needed: a possibility to select
> different out-of-bounds policies for both the bounds, e.g. throw
> when the lower bound is exceeded, clip when upper bound is
> exceeded.
> 

No.

> - How often would people need this library to work with types
> other than integral or floating-point? What kind of types would
> it be (cheap/expensive to copy)?

My usage would be integral-like types.