Re: String

["Marc A. Criley" <mcNOSPAM@mckae.com>]

Frode Tenneb� wrote:
> On Wednesday 31 August 2005 18:52 TC wrote:
>
>>there is a function that calculate string lenght?
> 
> 'Length
>
>>how use that?
> 
> Foo : constant String := "bar";
> Len : Integer := Foo'Length; -- Len=3

This is of course correct so long as one is using fully filled-out 
string values.

(Frode, I know you know all of the following, I'm just adding to it for 
the benefit of TC :-)

Ada does not implicitly support the C approach of treating strings as an 
array of characters terminating with a null (0).  So you can't use Ada's 
strings the same way you would C's strings.

If you are going to need variable length strings, the 
Ada.Strings.Unbounded package will probably meet your needs.

If you really need C-style strings, such as when interfacing to a C 
library, you can use the Interfaces.C.Strings package.  It has a Strlen 
function that can be applied to its definition of C strings.

(Both of these packages are part of the standard Ada distribution.)

Or you can write your own package to manage strings the way that you 
want.  But given the ready availability of the above string packages, 
there's really little to be gained by doing so, unless you have some 
special needs that you have to live with, e.g., hard real-time.

-- Marc A. Criley
-- McKae Technologies
-- www.mckae.com
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