* List of packages ?! @ 2003-05-22 13:48 Mirko Aigner 2003-05-22 16:24 ` Stephen Leake ` (2 more replies) 0 siblings, 3 replies; 5+ messages in thread From: Mirko Aigner @ 2003-05-22 13:48 UTC (permalink / raw) Hello I am a Student and I got the following problem. I got c++ Code and now I should reimplement it in Ada. My Problem is: I have a C++ Class only containing methods. In Ada this is a package, right ?! In C++ I can create a list containing this methods-only-class, is that possible for ada, too ?! thanks for the help Mirko Aigner ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: List of packages ?! 2003-05-22 13:48 List of packages ?! Mirko Aigner @ 2003-05-22 16:24 ` Stephen Leake 2003-05-22 16:25 ` Xavier Nicollin 2003-05-22 18:21 ` Noivet 2 siblings, 0 replies; 5+ messages in thread From: Stephen Leake @ 2003-05-22 16:24 UTC (permalink / raw) Mirko Aigner <Mirko.Aigner@alcatel.de> writes: > Hello I am a Student and I got the following problem. > I got c++ Code and now I should reimplement it in Ada. > My Problem is: I have a C++ Class only containing methods. In Ada this > is a package, right ?! Actually, a C++ class corresponds most closely to an Ada tagged type in a package. > In C++ I can create a list containing this methods-only-class, is > that possible for ada, too ?! Yes. Here is a "null data class with methods": package Null_Data_Class is type Object_Type is tagged null record; procedure Method_1 (Object : in Object_Type); procedure Method_2 (Object : in Object_Type); end Null_Data_Class; There are several list packages for Ada available; see www.adapower.com. > thanks for the help You're welcome. -- -- Stephe ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: List of packages ?! 2003-05-22 13:48 List of packages ?! Mirko Aigner 2003-05-22 16:24 ` Stephen Leake @ 2003-05-22 16:25 ` Xavier Nicollin 2003-05-23 5:07 ` Mirko Aigner 2003-05-22 18:21 ` Noivet 2 siblings, 1 reply; 5+ messages in thread From: Xavier Nicollin @ 2003-05-22 16:25 UTC (permalink / raw) Mirko Aigner wrote: > > Hello I am a Student and I got the following problem. > I got c++ Code and now I should reimplement it in Ada. > My Problem is: I have a C++ Class only containing methods. In Ada this > is a package, right ?! See below. > In C++ I can create a list containing this methods-only-class, It's been some time since I last programmed in C++, but I doubt you can create a list of *class(es)*. I guess you create a list of *class instances*, that is, a list of objects. So you should do the same in Ada. Which brings us back to your first question: no, a class is not a package; a class is a type defined in a package. If it has only methods, then the record is empty: package Pack is type T is tagged null record; -- could be private -- the methods: procedure P (X : in T; ...); function F (X : T; ...) return ...; end Pack; Now, you can create a list of objects of type T, that is, a list of instances of the class. Notice that, if your list should contain objects of any "class" including T and its derivatives, then you need accesses (pointers) to T'Class (T'Class is the type whose objects are of type T or of any type derived from T): type PT is access all T'Class; and your list elements are of type PT. I guess this is what you need (otherwise the list would not be very useful!) > is that possible for ada, too ?! Sure, see above. > thanks for the help You're welcome (in general, and in the Ada world, too). -- | Xavier NICOLLIN (mailto:Xavier.Nicollin@imag.fr) -- INPG (ENSIMAG) | VERIMAG -- Centre Equation -- 2, ave. de Vignate -- F-38610 Gi�res ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: List of packages ?! 2003-05-22 16:25 ` Xavier Nicollin @ 2003-05-23 5:07 ` Mirko Aigner 0 siblings, 0 replies; 5+ messages in thread From: Mirko Aigner @ 2003-05-23 5:07 UTC (permalink / raw) Thanks a lot to you Xavier Nicollin, Stephen Leake und Noivet !! Yes I meant instances of classes! So I have to define an empty type, and of this empty type I can create instances which can be hold in a list. Or the accesses of this type can be hold in a list. thx again !! Mirko Aigner ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: List of packages ?! 2003-05-22 13:48 List of packages ?! Mirko Aigner 2003-05-22 16:24 ` Stephen Leake 2003-05-22 16:25 ` Xavier Nicollin @ 2003-05-22 18:21 ` Noivet 2 siblings, 0 replies; 5+ messages in thread From: Noivet @ 2003-05-22 18:21 UTC (permalink / raw) I don't know C++ but if this helps you and if it's that what you search (list of packages) then look here: http://www.infeig.unige.ch/support/ada/gnatlb/ or http://www.adahome.com/rm95/rm9x-A.html ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2003-05-23 5:07 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2003-05-22 13:48 List of packages ?! Mirko Aigner 2003-05-22 16:24 ` Stephen Leake 2003-05-22 16:25 ` Xavier Nicollin 2003-05-23 5:07 ` Mirko Aigner 2003-05-22 18:21 ` Noivet
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