numericValue for (unicode) characters

[Andrei Alexandrescu]

On 1/2/13 3:13 PM, Dmitry Olshansky wrote:
> 1/2/2013 7:24 PM, bearophile пишет:
>> monarch_dodra:
>>
>>> The rationale for this:
>>> std.ascii: I think returning -1 as a magic number should help keep the
>>> code faster and with less clutter than with exceptions.
>>
>> For the ASCII version I have two use cases:
>> - Where I want to go fast&unsafe I just use "c - '0'".
>> - When I want more safety I'd like to use something as to!(), that
>> raises exceptions in case of errors.
>>
>> A function that works on ASCII and returns -1 doesn't give me much more
>> than "c - '0'". So maybe exceptions are good in the ASCII case too.
>>
>
> Then we can maybe just drop this function? What's wrong with
> if(std.ascii.isNumeric(a))
> a -= '0';
> else
> enforce(false);

Unnecessary flow :o).

enforce(std.ascii.isNumeric(a));
a -= '0';


Andrei