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From: kcline17@hotmail.com (Kevin Cline)
Newsgroups: comp.lang.ada
Subject: Re: Why is Ada a good choice for an ambitious beginner to programming
Date: 27 Dec 2002 09:27:48 -0800
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Hyman Rosen <hyrosen@mail.com> wrote in message news:<7WdO9.115704$4W1.35198@nwrddc02.gnilink.net>...
> Bill Findlay wrote:
> > C++ beginners just *might* have to learn about placement new,
> > to let them do things that are trivially easy in Ada;
> 
> What's the Ada equivalent? Is it something like
> 
>      for v'address use (some expression)
> 
> C++ "placement new" is somewhat more general - it's a way of
> passing parameters to (and thereby also selecting by overload
> resolution) a storage allocator. But it is trivially easy to
> use - it looks something like
> 
>      Type *ptr = new(ap1, ap2, ap3) Type(tp1, tp2, tp3);
> 
> The apn arguments are passed to the allocator selected by
> overload resolution on them, and the tpn arguments are then
> passed to the constructor of Type, which is built in the
> space returned by the allocator.
> 
> I don't think beginners need to learn about this, though.

With the STL it's possible to write a lot of interesting
and efficient C++ code without using new at all.