Re: type declaration and storage requirements

["Martin Dowie" <martin.dowie@nospam.baesystems.com>]

"Simon Wright" <simon@pushface.org> wrote in message
news:x7vptz79vr7.fsf@pushface.org...
> If your requirement is to specify a size for the values, say
>
>   type My_Short_Float_Type is new Float;
>   type My_Long_Float_Type is new Long_Float;
>
> or
>
>   subtype My_Short_Float_Type is Float;
>   subtype My_Long_Float_Type is Long_Float;
>
> which are pretty likely to map to C float and double.

or use Interfaces.C.C_Float and Interfaces.C.Double to be sure
to match C, or Interfaces.Integer_16, Interfaces.Integer_32 to
avoid even mentioning C ;-)


> If on the other hand your requirement is to specify the precision your
> algorithm requires, you really do need
>
>   type My_Float_Type is digits 7;
>
> and if it turns out that that needs 8 bytes (ie double), so be it.

Amen!