BigInt bool assign

[Don]

On 24.12.2011 02:30, Derek wrote:
> On Sat, 24 Dec 2011 09:19:26 +1100, bearophile
> <bearophileHUGS at lycos.com> wrote:
>
>> This is why it's better to avoid casts, not requiring them in the
>> first place, unless they are useful. In this case I think a cast
>> introduces more danger than the risks caused by implicit bool->int
>> conversions.
>
> If we assume that explicit casts are required for bool->int conversion,
> can you show some code in which this could cause a problem?

I think stuff like
int z +=  x > y;
should ideally require a cast. That's a crazy operation.

The problem is compatibility with ancient C code (pre-C99), where you 
may find:

alias int BOOL;

BOOL b = x > y;

Although BOOL is typed as 'int', it really has the semantics of 'bool'.
We have an example of this in D1's opEquals().
I think this is reason why implicit conversion bool -> int exists.

BTW, great to see you again, Derek!