Re: ATL, C2259, std::vector, and VS2003

From:
"Alexander Nickolov" <agnickolov@mvps.org>
Newsgroups:
microsoft.public.vc.atl
Date:
Mon, 1 May 2006 10:27:05 -0700
Message-ID:
<uDww4RUbGHA.472@TK2MSFTNGP05.phx.gbl>
Also have a look at the following FAQ article:

http://www.mvps.org/vcfaq/com/12.htm

--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@mvps.org
MVP VC FAQ: http://www.mvps.org/vcfaq
=====================================

"Kim Gr?sman" <kim@mvps.org> wrote in message
news:453b99c688c508c83b59536c2d62@news.microsoft.com...

Hi Jeff,

void resize(size_type _Newsize, _Ty _Val)
{ // determine new length, padding with _Val elements as needed
if (size() < _Newsize)
_Insert_n(end(), _Newsize - size(), _Val);
else if (_Newsize < size())
erase(begin() + _Newsize, end());

I don't see how Class B is abstract??? I'm used to blowing up in ATL
code, not STL code.


If B is an ATL implementation of a COM object, it *is* abstract. ATL adds
the concrete IUnknown implementation in the CComObject family of classes,
which are used for creation of objects.

You don't see CComObject much, but it's a part of the factory
implementation in ATL, and you can use it directly to create instances of
your objects, if you have source access to the implementation class:
 CComObject<CMyImplClass>* p = 0;
 CComObject<CMyImplClass>::CreateInstance(&p); // refcount = 0

I guess you could make a vector of CB pointers, rather than values, and
then instantiate and manage them as CComObjects, but I guess the easiest
is to save a CAdapt<CComPtr<IB>> in your vector, so resource management is
taken care of.

--
Best Regards,
Kim Gr?sman

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