String

String

[And838N]

Hello group!
I only have one question at this time and I will be out of the groups current discussion.  At least for a while anyway.

Where is the type String defined?  That is, which file, which package.  I grep'd all the spec files that came with the GNAT compiler and there is no line that says "type String is ...".  Is it in a lib somewhere?  what filename should I look for?

Thanks a bunch!!

Andrew

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Re: String

[Pascal Obry]

And838N@netscape.net writes:

> Where is the type String defined?  That is, which file, which package.  I
> grep'd all the spec files that came with the GNAT compiler and there is no
> line that says "type String is ...".  Is it in a lib somewhere?  what
> filename should I look for?

In package standard.adb, run gnatpsta to display it.

Pascal.

-- 

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--| Pascal Obry                           Team-Ada Member
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Re: String

[Sergey Koshcheyev]

<And838N@netscape.net> wrote in message
news:mailman.20.1054371405.386.comp.lang.ada@ada.eu.org...
> Hello group!
> I only have one question at this time and I will be out of the groups
current discussion.  At least for a while anyway.
>
> Where is the type String defined?  That is, which file, which package.  I
grep'd all the spec files that came with the GNAT compiler and there is no
line that says "type String is ...".  Is it in a lib somewhere?  what
filename should I look for?

It's defined in the package Standard. This is a special package, so it isn't
contained in any file, but is sort of preloaded into GNAT. If you run
"gnatpsta" (short for "print Standard"), you can see its contents.

Sergey.

Re: String

[Pascal Obry]

Pascal Obry <p.obry@wanadoo.fr> writes:

> In package standard.adb, run gnatpsta to display it.

I meant standard.ads (this is a spec), but well this file does not really
exist on the file system anyway.

Pascal.

-- 

--|------------------------------------------------------
--| Pascal Obry                           Team-Ada Member
--| 45, rue Gabriel Peri - 78114 Magny Les Hameaux FRANCE
--|------------------------------------------------------
--|         http://perso.wanadoo.fr/pascal.obry
--| "The best way to travel is by means of imagination"
--|
--| gpg --keyserver wwwkeys.pgp.net --recv-key C1082595

Re: String

[Jeffrey Carter]

And838N@netscape.net wrote:
 >
 > Where is the type String defined?  That is, which file, which
 > package.  I grep'd all the spec files that came with the GNAT
 > compiler and there is no line that says "type String is ...".  Is it
 > in a lib somewhere?  what filename should I look for?

String is defined in package Standard, and Standard is defined in the 
ARM (ARM A.1).

Standard is a special package; everything you compile is considered to 
be compiled as part of package Standard. This is why you can use the 
types declared in Standard (Integer, Boolean, String, and so on) without 
having to put "with Standard; use Standard;" on everything.

As such, Standard is unlikely to exist as a file for any compiler.

-- 
Jeff Carter
"When Roman engineers built a bridge, they had to stand under it
while the first legion marched across. If programmers today
worked under similar ground rules, they might well find
themselves getting much more interested in Ada!"
Robert Dewar

String

[TC]

there is a function that calculate string lenght?
how use that?

Re: String

[Frode Tennebø]

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

 -Frode

-- 
^ Frode Tenneb� | email: frode@tennebo.com | Frode@IRC ^
|  with Standard.Disclaimer; use Standard.Disclaimer;  |

Re: String

[Pascal Obry]

Frode Tenneb� a �crit :
> On Wednesday 31 August 2005 18:52 TC wrote:
> 
> 
>>there is a function that calculate string lenght?
> 
> 'Length

Just to point out that it is called an attribute in Ada.

Pascal.

-- 

--|------------------------------------------------------
--| Pascal Obry                           Team-Ada Member
--| 45, rue Gabriel Peri - 78114 Magny Les Hameaux FRANCE
--|------------------------------------------------------
--|              http://www.obry.net
--| "The best way to travel is by means of imagination"
--|
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Re: String

[Marc A. Criley]

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
-- DTraq - XPath In Ada - XML EZ Out

Re: String

[Martin Krischik]

TC wrote:

> there is a function that calculate string lenght?
> how use that?

What kind of string?

Read: http://en.wikibooks.org/wiki/Ada_Programming/Strings.

Martin
-- 
mailto://krischik@users.sourceforge.net
Ada programming at: http://ada.krischik.com

Re: String

[Marin David Condic]

Additional observation. The 'Length attribute only tells you about the 
allocated space - not any sort of logical end of the string. Trailing 
spaces, nulls, line terminators or any of the other mechanisms that 
might tell you where the string stops (but not where the storage stops) 
do NOT figure in to the value of the 'Length attribute.

This is often less than useful. I recommend that the reader look into 
Ada.Strings.Unbounded (or Ada.Strings.Fixed) for strings that have 
dynamic lengths.

MDC

Pascal Obry wrote:
> 
> 
> Just to point out that it is called an attribute in Ada.
> 
> Pascal.
> 

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Re: String

[Preben Randhol]

In article <AflRe.39695$HM1.1116430@twister1.libero.it>, TC wrote:
>there is a function that calculate string lenght?
>how use that?

Recommended: http://www.it.bton.ac.uk/staff/je/adacraft/