Re: [Boost-users] [boost] [review][constrained_value] Review of Constrained Value Library begins today

Subject: Re: [Boost-users] [boost] [review][constrained_value] Review of Constrained Value Library begins today
From: Mika Heiskanen (mika.heiskanen_at_[hidden])
Date: 2008-12-05 10:25:54

Thorsten Ottosen wrote:
> Mika Heiskanen skrev:
>> Mathias Gaunard wrote:
>>> Mika Heiskanen wrote:
>>>
>>>> If the value must be checked beforehand, why bother using a constrained
>>>> type at all?
>>>
>>> Because it performs checking in debug mode to make sure the invariant 
>>> is indeed true.
>>
>> I do not believe boost should accept a library which would only work in
>> debug mode. 
> 
> How different users want to respond to errors should not be mandated by 
> the library. Therefore it is very good that this library allows you to 
> customize it.
> 
> There is a difference between protecting against accidental misuse and 
> deliberate misuse of a component. Why can rarely protect against the 
> latter.
> 
> Having invariants checked only in debug mode is very common, FWIW.

I did not express my thoughts very well the last time. Retry:

I am not against having invariants checked only in debug mode, if the user
so chooses. I am however against it being the default mode. I believe the
most sensible default would be to throw an exception both in debug and
release modes, since I believe this to be the most common use case.

--> Mika Heiskanen