一个真的困扰我的问题...... [英] A Question that really bothers me...
问题描述
好了，问题就是这个。
我用Visual Studio 2008编译了一些旧代码（代码是
最初在Visual Studio 6中编写） ）我有这个错误：
错误1错误C2681：''void *''：无效的表达式类型为
dynamic_cast c：\Works \\ \\ BaCCTester\Dev\Addins\Utils
\ CommonDataManipulators \Sources \CommonDataFree.cpp 121
CommonDataManipulators
和有问题的代码行是：
....
FunctionResponse * pFunctionResponse =
ACE_dynamic_cast（FunctionResponse *，data） ;
....
因此，当我转换时，dynamic_cast不适用于void指针
指向void的指针我放弃了所有类型
的信息。但是，让我三思而后的关于
上一句话的核心性的原因是，这段代码完全可以在Visual B / B $ Studio $ 6下编译。我想知道更多关于这个问题所以任何帮助，
参考，链接等都非常高度赞赏。
谢谢，
Nikola Tanev
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.
Thank You,
Nikola Tanev
推荐答案
更多想法添加：
RTTI开启
2月26日，上午10:33，j123 ... @ gmail.com < j123 ... @ gmail.comwrote：
ONE MORE THINK TO ADD:
RTTI is turned ON
On Feb 26, 10:33 am, "j123...@gmail.com" <j123...@gmail.comwrote:
好了，问题是这个。
我编了一些使用Visual Studio 2008的旧代码（代码是最初在Visual Studio 6中写的
），我有这个错误：
错误1错误C2681：'' void *''：无效的表达式类型
dynamic_cast c：\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\ _CommonDataFree.cpp 121
CommonDataManipulators
和有问题的代码行是：
...
FunctionResponse * pFunctionResponse =
ACE_dynamic_cast（FunctionResponse *，data）;
...
所以它是逻辑上，dynamic_cast不适用于void-pointers
，因为当我将指针转换为void时，我放弃了所有类型的
信息。但是，让我三思而后的关于
上一句话的核心性的原因是，这段代码完全可以在Visual B / B $ Studio $ 6下编译。我想知道更多关于这个问题所以任何帮助，
引用，链接等等都是高度关注的。
谢谢你，
Nikola Tanev
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.
Thank You,
Nikola Tanev
2月26日上午10:33，j123 ... @ gmail.com < j123 ... @ gmail.comwrote：
On Feb 26, 10:33 am, "j123...@gmail.com" <j123...@gmail.comwrote:
现在问题是这个。
Ok now the problem is this.
我用Visual Studio 2008编译了一些旧代码（
代码最初在Visual Studio 6中编写）和我有这个
错误：
I have compiled some old code with Visual Studio 2008 (the
code was originally writen in Visual Studio 6) and i have this
error:
错误1错误C2681：''void *''：<的表达式类型无效br />
dynamic_cast c：\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ b $ b CommonDataManipulators
Error 1 error C2681: ''void *'' : invalid expression type for
dynamic_cast c:\Works\BaCCTester\Dev\Addins\Utils
\CommonDataManipulators\Sources\CommonDataFree.cpp 121
CommonDataManipulators
和有问题的代码行是：
...
FunctionResponse * pFunctionResponse =
ACE_dynamic_cast（FunctionResponse *，data）;
...
and the problematic line of code is this:
...
FunctionResponse* pFunctionResponse =
ACE_dynamic_cast(FunctionResponse*, data);
...
因此，当我将指针转换为void时，dynamic_cast对
void-pointers不起作用是逻辑上的。
有放弃所有类型的信息。但是让我觉得两个关于前一句话的核心性的两次是
这段代码在Visual Studio 6下完美编译。我会
想了解更多关于这个问题的信息，所以任何帮助，参考资料，
链接等都是高度关注的。
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.
真正的问题是ACE_dynamic_cast是什么。我怀疑
它是一个宏，并且可能根据
编译器的不同而扩展，但我真的不知道。
-
James Kanze（GABI软件）电子邮件：ja ********* @ gmail.com
Conseils eninformatiqueorientéeobjet /
Beratung in objektorientierter Datenverarbeitung
9placeSémard，78210 St.-Cyr-l''coco，France，+ 33（0）1 30 23 00 34
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.
--
James Kanze (GABI Software) email:ja*********@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientierter Datenverarbeitung
9 place Sémard, 78210 St.-Cyr-l''école, France, +33 (0)1 30 23 00 34
2月26日上午11:37，James Kanze< james.ka ... @ gmail.comwrote：
On Feb 26, 11:37 am, James Kanze <james.ka...@gmail.comwrote:
2月26日上午10点33分，j123 ... @ gmail.com < j123 ... @ gmail.comwrote：
On Feb 26, 10:33 am, "j123...@gmail.com" <j123...@gmail.comwrote:
现在问题是这个。
我用Visual编译了一些旧代码Studio 2008（
代码最初是在Visual Studio 6中编写的）我有这个
错误：
错误1错误C2681：'' void *''：无效的表达式类型
dynamic_cast c：\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\ _CommonDataFree.cpp 121
CommonDataManipulators
和有问题的代码行是：
...
FunctionResponse * pFunctionResponse =
ACE_dynamic_cast（FunctionResponse *，data）;
...
因此，逻辑上说dynamic_cast不适用于
void-pointers因为当我将指针转换为void时我
放弃了所有类型信息。但是让我觉得两个关于前一句话的核心性的两次是
这段代码在Visual Studio 6下完美编译。我会
想了解更多关于这个问题的信息，所以任何帮助，参考资料，
链接等都是高度关注的。
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.
真正的问题是ACE_dynamic_cast是什么。我怀疑
它是一个宏，并且可能根据
编译器的不同而扩展，但我真的不知道。
-
James Kanze（GABI软件）电子邮件：james.ka ... @ gmail.com
Conseils eninformatiqueorientéeobjet/
Beratung in objektorientierter Datenverarbeitung
9placeSémard，78210 St.-Cyr-l''coco，France，+ 33（0）1 30 23 00 34
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.
--
James Kanze (GABI Software) email:james.ka...@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientierter Datenverarbeitung
9 place Sémard, 78210 St.-Cyr-l''école, France, +33 (0)1 30 23 00 34
是的它是一个宏
#define ACE_dynamic_cast（TYPE，EXPR）dynamic_cast< TYPE（EXPR）
这是一个标准dynamic_cast，它来自ACE库
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
这篇关于一个真的困扰我的问题......的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
