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From: Richard Riehle <richard@adaworks.com>
Newsgroups: comp.lang.ada
Subject: Re: Anybody in US using ADA ? One silly idea..
Date: Fri, 24 Jan 2003 17:40:00 -0800
Organization: AdaWorks Software Engineering
Message-ID: <3E31EAF0.6A322860@adaworks.com>
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Xref: archiver1.google.com comp.lang.ada:33414
Date: 2003-01-25T01:30:50+00:00
List-Id: <comp.lang.ada>

Hyman Rosen wrote:

> C++ template specialization is different though; it doesn't
> (necessarily) involve tagged types at all. Here's a simple
> example:
>
> // General case
> template<int N>
> struct Factorial { enum { Value = N * Factorial<N - 1>::Value } };
>
> // Specialization for 0
> template<>
> struct Factorial<0> { enum { Value = 1 } };
>
> // Use it, as a compile-time constant expression
> int array[Factorial<5>::Value];
>
> When you ask for Factorial<0>, the compiler uses the special case
> you provided, otherwise it uses the general case.

This looks a lot like a form of overloading.   Combine this with
generic subprograms, or generic child library units, and we have
a pretty close match in capability.

Richard Riehle