Re: Order of logical operations

["Björn Persson" <spam-away@nowhere.nil>]

James Van Buskirk wrote:

> I am curious
> as to how useful short-circuiting logical operators are
> considered to be in languages such as Ada that have both
> short-circuiting and non-short-circuiting operators.

Well I use them frequently in "if" statements where the first test 
determines whether the second test would be valid. An example:

    if Str'Length > 0 and then Str(1) = Apostrophe then
       Do_A;
    else
       Do_B;
    end if;

If Str'Length is zero then there is no Str(1), so without 
short-circuiting operators I'd have to write:

    if Str'Length > 0 then
       if Str(1) = Apostrophe then
          Do_A;
       else
          Do_B;
       end if;
    else
       Do_B;
    end if;

-- 
Björn Persson

jor ers @sv ge.
b n_p son eri nu