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From: "jimmaureenrogers@worldnet.att.net" <jimmaureenrogers@worldnet.att.net>
Newsgroups: comp.lang.ada,comp.lang.c++
Subject: Re: Teaching new tricks to an old dog (C++ -->Ada)
Date: 24 Mar 2005 11:41:14 -0800
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Date: 2005-03-24T11:41:14-08:00
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Pascal Obry wrote:
> Jim Rogers <jimmaureenrogers@att.net> writes:
>
> > One Ada feature that cannot be implemented through any container
library
> > is the ability to define a range-restricted floating point type.
You can
> > do this in C++, but not through the use of a template. Templates
cannot
> > take floating point values as parameters.
>
> Is that still true ? I have never understood why there was such
> restriction...

I believe this is still true. I hope I will be corrected by a C++
expert if I am wrong.

My understanding is that C++ cannot rely on a particular floating point
representation across platforms. This inability to define type
representation appears to make template parameter instantiation
difficult
for C++. I am guessing that this is a side-effect of the C and C++
type system for primitive types, where the type is very strongly
related to its physical representation.

Jim Rogers