Re: for S'Image use Func??

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On Mon, 10 May 2010 16:52:18 +0000 (UTC), Warren wrote:

> Dmitry A. Kazakov expounded in
> news:zvtps4jzmo1z$.mzhapf4p7b4a.dlg@40tude.net: 
> 
>> On Mon, 10 May 2010 15:48:19 +0000 (UTC), Warren wrote:
>> 
>>> Another thing that bugs me is that the Ada.Text_IO
>>> will not return a LF character (like getchar() in C).
>> 
>> Why should it? It is a text I/O not a stream I/O.
> 
> But if I recall correctly, I also cannot get an
> empty string as input. An empty string is still
> valid input.

Hmm, try this:

with Ada.Text_IO; use Ada.Text_IO;
procedure Test_In is
begin
   loop
      declare
         Input : String := Get_Line;
      begin
         exit when Input'Length = 0;
      end;
   end loop;
end Test_In;
 
>> C's I/O is a disaster, 
> 
> You have only listed an opinion when you don't 
> list specifics.

Did you used it? Character input returns integer, file is a number,
sometimes a pointer, do you use  fseek or lseek? Is errno thread safe in
UNIX? (What does C say about threads?)
 
>> I
>> do prefer Ada packages for I/O. Formatting/serialization is a totally
>> unrelated issue. 
> 
> The problem is that Ada should have separated formatting
> from I/O (as someone else here has said).

Yes, but back in 80's nobody did. FORTRAN, PL/1, C all had it conflated.

> C of course did
> the same thing, except that they made formatting a string
> easier.

Easier? It is untyped! There is no thing worse than that. We constantly
fight with catching:

   printf ("%s", X);

X is an object of the type having implicit conversion to const * for output
purpose.

>> I wonder why people paying so much attention to
>> admittedly broken and misplaced formatting of Ada.Text_IO in the times
>> of GUIs. It won't work anyway. It is not a text anymore.
> 
> Do you enter a picture when login to your favourite GUI
> system? A wave file for your password?  We still depend 
> a lot on Text. Look at any database- it's not all about
> blobs.

No, it is, for instance, about columned output of fixed point numbers in
proportional font aligned along the decimal point...

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de