Re: inheriting from std::vector bad practice?

From:
"Alf P. Steinbach" <alfps@start.no>
Newsgroups:
comp.lang.c++
Date:
Sat, 03 Apr 2010 23:38:25 +0200
Message-ID:
<hp8cjv$3k6$1@news.eternal-september.org>
* James Kanze:

On Apr 3, 5:16 pm, "Alf P. Steinbach" <al...@start.no> wrote:

* Leigh Johnston:

"Alf P. Steinbach" <al...@start.no> wrote in message
news:hp7p5m$6rb$1@news.eternal-september.org...
I repeat: interface augmentation (which is what my reply was referring
to) is quite valid


Sometimes interface augmentation is a good idea, but in this
case there is no interface augmentation.


Strangely enough, I have to agree with Leigh here. (Doesn't
happen very often.) From what little we know of the global
context, this seems very much like what I would call "interface
augmentation". My only objection to the derivation is that in
C++ (unlike the case in e.g. Java), the idiomatic form of
interface augmentation is by using free functions: we have
std::sort, rather than std::vector<>::sort, etc.


In addition to the code itself we have the OPs statement that std::vector<Point>
is just an arbitrary implementation detail, where all he uses is push_back.

It's not an intended interface.

And with no intended interface there's no augmentation.

Cheers & hth.,

- Alf

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