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Newsgroups: comp.lang.ada
Subject: Re: why learn C?
From: Georg Bauhaus <bauhaus@futureapps.de>
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Date: Thu, 12 Apr 2007 23:11:32 +0200
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Date: 2007-04-12T22:10:01+02:00
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On Thu, 2007-04-12 at 16:05 +0000, Hyman Rosen wrote:
> Georg Bauhaus wrote:
> > And then, unfortunately, C++ doesn't have dynamic types
> > (unless I'm missing something):
> > 
> > template <int left>
> > int foo(int n)
> > {
> >   typedef class RangedInt<left, n> Int;
> 
> You are correct that C++ does not support this, but
> incorrect that it is unfortunate.

I beg to differ. When there are reasons not to support
this kind of nesting in C++, I still see nesting of things
including types as a feature of Ada that is valuable. Much
like local subprograms can act as a locally needed singleton
with suitably restricted visibility of its surroundings:
there is no need for a singleton at the service of a single
subprogram, say. But there are local packages, local types,
...,  and now inward closures.
  Is a std::unary_function so much more attractive for
the cases it can handle?