Re: std::string bad design????

"Daniel T." <>
13 Jan 2007 16:02:20 -0500
"Le Chaud Lapin" <> wrote:

Mirek Fidler wrote:

Le Chaud Lapin wrote:

Most of my containers
(non-tree) have indexing operations using unsigned int as the index, so

What is the point of maintaining internal iterators then?

The best I can say is that, for me, it creates the right "mood" when
using the containers.

For example, let's say you have a map, that maps names to telephone

Associative_Set::<String__, Phone_Number> phonebook;
// Add several entries to phonebook.

, and I want to change the telephone number of "Le Chaud Lapin".
Instead of having an "update key value function", I first "locate" the
row that contains my name, then assign to the right-hand-side of the
located element:

phonebook.locate("Le Chaud Lapin");
phonebook.RHE() = "08 70 35 19 38";

Others have objected to the above based on threading issues, I'm not
sure that is relevant since C++ doesn't have any standard threading
model, but I have a different objection.

Your phonebook object has internal state that the user of the object
must know in order to use it correctly. In other words, I can't call
RHE() without first checking, or otherwise knowing, that the internal
marker is in the right place. I call that poor encapsulation.

Now I grant that iterators also have poor encapsulation (I have to
check, or otherwise know that the iterator is not equal to the end
element before dereferencing it.) But I see no reason to call your
solution any better when it has the same problem.

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