Re: [Algorithms] C++ inherited constructors

[Adam M. <amo...@dp...>]

That, together with the fact that constructors can't return error codes
(only throw exceptions) when something goes wrong, has me following a very
simple design heuristic ever since I can remember:  Don't make a constructor
do anything other than initializing member variables.  In other words, don't
let it do anything that can go wrong.  Put that code (for example the thread
creation code in your case) in another method that has to be called after
construction.  If you had done that when you designed the CThread class, you
wouldn't have a problem.
--
--Adam Moravanszky
http://www.n.ethz.ch/student/adammo

-----Original Message-----
From: Matt Adams <de...@gm...>
To: gda...@li...
<gda...@li...>
Date: Saturday, July 15, 2000 1:19 PM
Subject: Re: [Algorithms] C++ inherited constructors


>I need this for aesthetic reasons :)
>I've got an abstract CThread class. If a want to create a new thread, I
>build my process class and inherit CThread, which creates a new thread by
>construction.
>Now I want my main-threadloop-class to inherit CThread, too, to provide all
>the thread functionality to my main thread. But that thread already exists
> created by compiler ), and shouldn't be created again by CThread.
>Of course I can put CThread () and ~CThread () in functions like Create()
>and Destroy() and leave the constructor / destructor empty. But it'd be
>nicer if it could be done in another way...
>
>----- Original Message -----
>From: Favnir
>To: gda...@li...
>Sent: Saturday, July 15, 2000 1:32 PM
>Subject: Re: [Algorithms] C++ inherited constructors
>
>The only way you can do this is to define a (preferably) protected
>do-nothing constructor for the base class, and inherit it in the subclass
>constructor.
>
>But, why in the world would you need to do this, in the first place?
>
>Are,
>F
>
>----- Original Message -----
>From: Matt Adams
>To: gda...@li...
>Sent: Saturday, July 15, 2000 12:22 PM
>Subject: [Algorithms] C++ inherited constructors
>
>
>Hi,
>
>I got a question about the C++ class hierarchy.
>
>class a
>{
>    a () {...}; // constr a
>};
>
>class b : a
>{
>    b () {...}; // constr b
>};
>
>b instance;
>
>When creating an instance of b, constructors for both class a and class b
>are called.
>Is there a way to suppress the automatic calling of constructor a ?
>Or something like 'overloading' the old constructor by a new one ?
>I couldn't find anything like that in the compiler docs.
>
>Any help appreciated,
>Matt
>
>
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