ElementEncodingType and immutable

[bioinfornatics]

On Friday, 22 November 2013 at 10:07:12 UTC, Jonathan M Davis 
wrote:
> On Friday, November 22, 2013 10:17:40 bioinfornatics wrote:
>> On Friday, 22 November 2013 at 07:54:45 UTC, Jonathan M Davis
>> 
>> wrote:
>> > On Friday, November 22, 2013 01:01:52 bioinfornatics wrote:
>> >> hi with this code: http://www.dpaste.dzfl.pl/2f830da1
>> >> I do not understand why alias Char is equal to 
>> >> immutable(char)
>> >> 
>> >> How to fix these issues?
>> > 
>> > I'm not quite sure which line you're refering to here, but
>> > ElementEncodingType
>> > is going to give the same constness as the elements - e.g.
>> > ElementEncodingType!string is going to be immutable(char), 
>> > not
>> > char.
>> > 
>> > Also, you're doing something with AAs, and all keys for AAs 
>> > are
>> > immutable,
>> > even if you don't explicitly mark them as immutable, so if if
>> > the type that
>> > you're using ElementEncodingType was a key in an AA, that 
>> > could
>> > be your
>> > problem.
>> > 
>> > However, the first error that's popping up seems to relate to
>> > the fact that
>> > ranges treat strings as ranges of dchar, not char, so 
>> > sequence
>> > gives you
>> > letters which are dchar, not char, and then you try and 
>> > assign
>> > it to an AA
>> > which holds immutable(char) rather than dchar (and the fact
>> > that the AA holds
>> > immutable(char) rather than char might cause further problems
>> > with being able
>> > to reassign anything in the AA - and if it doesn't it's
>> > probably due to the AA
>> > doing casting internally when it shouldn't).
>> > 
>> > - Jonathan M Davis
>> 
>> Thanks Jonathan
>> 
>> I try to have a dynamic type
>> If sequence is immutable(char)[] AA become char[ubyte]
>> If sequence is immutable(dchar)[] AA become dchar[ushort] …
>
> Then you can't put sequence in a range and get its value out 
> from there.
> immutable(char)[]will be treated as a range of dchar, so you'll 
> get dchars,
> not chars. If you want to operate on a string as chars, then 
> don't use it as a
> range. The closest that you could get to operating on it as a 
> range of chars
> would be to use std.string.representation and operate on it as
> immutable(ubyte)[].
>
> - Jonathan M Davis

std.string.representation is great but return a numeric array 
instead of numeric type. Ex ubyte[]
  For ascii but me i try to get ubyte.