Re: change vector type?

From:

red floyd <no.spam.here@its.invalid>

Newsgroups:

comp.lang.c++.moderated

Date:

Sat, 9 Oct 2010 14:06:11 CST

Message-ID:

<i8oqfa$hkk$1@news.eternal-september.org>

On 10/7/2010 11:25 AM, Jens Schmidt wrote:

Ulrich Eckhardt wrote:

Jens Schmidt wrote:

as one of the probable private fields of vector is initialized with
sizeof (char) it will have a wrong value for sizeof (mytype).

Just wondering, why would the vector need to store the size of its
elements anywhere, or have a field initialized with that size?

Sorry, this was based on the part you didn't cite: "without testing".
Probably this was too much oldstyle C-think. For C++ implementations
this sizeof() can be processed (and is in a widespread implementation)
at compile time. But is there a guarantee?

However, now that I think about it, while element size may not be
stored, I can definitely imagine an implementation where
vector<T>::size() uses a stored value rather than calculating it
each time.

So vector<OtherType>::size() would be incorrect in that situation.

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