size_t index=-1;

[Ola Fosheim Grøstad via Digitalmars-d-learn]

On Saturday, 19 March 2016 at 10:01:41 UTC, Basile B. wrote:
> On Saturday, 19 March 2016 at 09:33:25 UTC, tsbockman wrote:
>> [...] The reason that *attempting* such a comparison produces 
>> such weird results, is because the signed value is being 
>> implicitly cast to an unsigned type.
>
> Yes and that's the opposite that should happend: when signed 
> and unsigned are mixed in a comparison, the unsigned value 
> should be implictly cast to a wider signed value. And then it 
> works!
>
> - https://issues.dlang.org/show_bug.cgi?id=15805
> - 
> https://github.com/BBasile/iz/blob/v0.5.8/import/iz/sugar.d#L1017

I have no problem with C++ compilers complaining about 
signed/unsigned comparisons. It sometimes means you should 
reconsider the comparison, so it leads to better code.

The better solution is to add 7, 15, 31 and 63 bit unsigned 
integer types that safely converts to signed (this is what Ada 
does) and remove implicit conversion for unsigned 8,16,32, and 64 
bit integers.