Re: A Question that really bothers me...
On 26 Feb., 17:43, Puppet_Sock <puppet_s...@hotmail.com> wrote:
On Feb 26, 8:18 am, "j123...@gmail.com" <j123...@gmail.com> wrote:
On Feb 26, 11:37 am, James Kanze <james.ka...@gmail.com> wrote:
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 t=
ype 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);
[snip]
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.
Yes it is a macro
# define ACE_dynamic_cast(TYPE, EXPR) dynamic_cast<TYPE> (EXPR)
actualy it is a standard dynamic_cast and it is from the ACE libraries
<InigoMontoyaVoice>You keep using that word. I do not think
it means what you think it means.</voice>
In this news group, "standard" means part of the standard
C++ language, not part of a commercial library, no matter
how many people use it.
But we found out that it really was a dynamic_cast (the errormessage
itself did show that if you read carefull), and in that case the
question definitely is standard, no matter if this is hidden inside
some hideous macro.
As to your original question:
- Did you read the help files for VS?
Compiler Error C2681
A casting operator tried to convert from an invalid type.
For example, if you use the dynamic_cast operator to
convert an expression to a pointer type, the source
expression must be a pointer.
- Did you consider asking your question in a news group
dealing with VS?
This question would only be appropriate in case the answer here
indicated that VS has a nonstandard behaviour.
[snip]
/Peter