Re: Generic Programming - What Is the Best Method? (Was: Intelligent

On 1 apr, 06:20, "Gerry Ford" <ge...@nowhere.ford> wrote:
> "Craig Powers" <eni...@hal-pc.org> wrote in message
>
> news:47f16d7d$0$1732$a726171b@news.hal-pc.org...
>
>
> 
> 
> 
> 
> 
>
> http://www.stlport.org/resources/StepanovUSA.html
> The above is an informative link and below is an excerpt.
>
> Question:
> Could you explain to a modest C++ programmer what Generic Programming is,
> what is the relation of Generic Programming with C++ and STL, and how did
> you come to use Generic Programming in a C++ context?
>
> Answer:
> Generic programming is a programming method that is based in finding the
> most abstract representations of efficient algorithms. That is, you start
> with an algorithm and find the most general set of requirements that allow
s
> it to perform and to perform efficiently. The amazing thing is that many
> different algorithms need the same set of requirements and there are
> multiple implementations of these requirements. The analogous fact in
> mathematics is that many different theorems depend on the same set of axio
ms
> and there are many different models of the same axioms. Abstraction works!
> Generic programming assumes that there are some fundamental laws that gove
rn
> the behavior of software components and that it is possible to design
> interoperable modules based on these laws. It is also possible to use the
> laws to guide our software design. STL is an example of generic programmin
g.
> C++ is a language in which I was able to produce a convincing example.
>
> When I first read this a couple ws ago, I wondered what this looks like
> in fortran:
>
> template <class StrictWeakOrdered>
> inline StrictWeakOrdered& max(StrictWeakOrdered& x,
> StrictWeakOrdered& y) {
> return x < y ? y : x;
>
> }
>
> and
> template <class StrictWeakOrdered>
> inline const StrictWeakOrdered& max(const StrictWeakOrdered& x,
> const StrictWeakOrdered& y) {
> return x < y ? y : x;
>
> }
>
> --
>
> "I am waiting for them to prove that God is really American."
>
> ~~  Lawrence Ferlinghetti

That is an easy one:

max(x,y)

Well, this Fortran equivalent is a trifle less powerful than the C++
one,
but that does not mean it is not basically true :).

Regards,

Arjen

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