Re: A Question that really bothers me...

From:
James Kanze <james.kanze@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Tue, 26 Feb 2008 02:37:08 -0800 (PST)
Message-ID:
<e12f4e33-3cfa-47cd-b023-e23a86f3d1f3@u69g2000hse.googlegroups.com>
On Feb 26, 10:33 am, "j123...@gmail.com" <j123...@gmail.com> wrote:

Ok now the problem is this.

I have compiled some old code with Visual Studio 2008 (the
code was originally writen in Visual Studio 6) and i have this
error:

Error 1 error C2681: 'void *' : invalid expression type for
dynamic_cast c:\Works\BaCCTester\Dev\Addins\Utils
\CommonDataManipulators\Sources\CommonDataFree.cpp 121
CommonDataManipulators

and the problematic line of code is this:
...
FunctionResponse* pFunctionResponse =
ACE_dynamic_cast(FunctionResponse*, data);
...

So it is logicaly that dynamic_cast does not work for
void-pointers since when I converted the pointer to void I
have given up all type information. But what makes me think
twice about the corectness of the previous sentence is that
this code compiles perfectly under Visual Studio 6. I would
like to know more about this issue so any help, references,
links and so are highly appriciated.


The real question is what ACE_dynamic_cast is. I suspect that
it's a macro, and probably expands differently depending on the
compiler, but I really don't know.

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