Re: noobs and pointers

"James Kanze" <>
16 Apr 2007 01:12:13 -0700
On Apr 16, 3:30 am, "Salt_Peter" <> wrote:

On Apr 15, 3:42 pm, (Roland Pibinger) wrote:

On Sat, 14 Apr 2007 19:24:43 +0000 (UTC), I V <>

On Sat, 14 Apr 2007 08:57:23 +0000, Roland Pibinger wrote:

Students are a classic objects (in the sense of OOP) which are
characterized by identity, state and behavior. You usually do not

Really? I would have thought that Randy's Student class is a classic
_value_. Their identity is defined by equivalence (I don't
think you would want to treat students with the same name, at the same
school, with the same id, as being different), and they don't really h=


any behavior (the only methods the class has are accessors). Why do you
think they should be considered entities?

What should the following mean?

Student Ivlenin;
Student Randy = Ivlenin;

In the case a collection of unique Students is indeed required,
shouldn't that requirement be maintained by the container?

A container is just that, a container. It doesn't maintain
anything, logically.

std::set<Student> or std::map<int/*id*/, Student>
Lets face it, using pointers and uncopyable Students will not satisfy
the requirement of unique objects in any way.

It means that the identity of an object cannot be lost.

What if the dataset contains a duplicate value?

Then I have an error in my program.

Why should a program be handicapped from copying students based on a

What's the handicap? If copying an object is an error, how does
catching it at compile time rather than at execution time
constitute a handicap?

Why should a program be forced to depend on unsafe, raw pointers only?

Have you stopped beating your wife? Raw pointers are neither
more nor less safe than anything else. Used correctly, they
work well. Used incorrectly, they don't.

James Kanze (GABI Software)
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