[Exceptional C++ Style] Exceptional C++ Style - Item 24: Cons tant Optimization

[James Dennett]

On Monday, January 24, 2005, at 05:47 AM, David Nash wrote:

>>
>> Except that would invoke the dreaded Undefined Behaviour.
>>
>> See 7.1.5.1/4
>>
>> Ric
>
> Ah, right.  I stand corrected.  I did test it but didn't think of
> checking the standard.
>

There are cases where testing will show unexpected behaviour
for this case -- in some situations the compiler will optimize the
const value and replace it at compile times, in other situations it
might use the "new value", so giving inconsistent output.

-- James