warning C4541: 'dynamic_cast' used on polymorphic type 'class MyObject' with /GR-; unpredictable beh
来源:互联网 发布:淘宝什么祛疤效果最好 编辑:程序博客网 时间:2024/06/10 01:27
今天在VC6.0中使用dynamic_cast<>运算符时遇到一个莫明其妙的警告:
warning C4541: 'dynamic_cast' used on polymorphic type 'class MyObject' with /GR-; unpredictable behavior may result.
而这个警告实际上是一个严重的错误,回导致程序异常中止,可我检查发现代码上没有错误啊?! 后来上MSDN查询编译器/GR选项的含义时,终于弄清楚了这个问题。
原来这个问题是因为VC6.0编译器默认不支持C++中的RTTI,所以在编译包含dynamic_cast或者typeid运算符的程序时就会发出警告。“/GR-”选项的含义就是表示关闭“/GR”( 即Grant RTTI ) 。 解除这个警告的办法就是打开"/GR"选项或者直接在编译器参数中添加"/GR"即可。
MSDN中的全文描述如下:
/GR (Enable Run-Time Type Information)
The Enable Run-Time Type Information option (/GR) causes the compiler to add code to check object types at run time. When this option is specified, the compiler defines the _CPPRTTI preprocessor macro. The option is cleared (/GR–) by default.
To find this option in the development environment, click Settings on the Project menu. Then click the C/C++ tab, and click C++ Language in the Category box.
解决方法:
project->Settings->c/c++(catagory)->c++ language
在Enable Runtime Type Information(RTTI)前勾选。
本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/miyunhong/archive/2010/01/15/5193589.aspx
- warning C4541: 'dynamic_cast' used on polymorphic type 'class MyObject' with /GR-; unpredictable beh
- warning C4541: 'dynamic_cast' used on polymorphic type 'class CWnd' with /GR-; unpredictable behavior may result
- warning C4541: 'dynamic_cast' used on polymorphic type 'class CWnd' with /GR-; unpredictable behavio
- warning C4541: 'dynamic_cast' used on polymorphic type 'class CWnd' with /GR-; unpredictable behavi
- warning C4541: “dynamic_cast”用在了带 /GR- 的多态类型“CWnd”上;可能导致不可预知的行为的解决办法
- 使用dynamic_cast报错source type is not polymorphic
- Instance member cannot be used on type
- warning: pointer of type 'void *' used in arithmetic
- rails has_many on polymorphic
- 警告: deleting object of polymorphic class type which has non_virtual destructor
- gcc warning: '0' flag used with ?s?printf format
- Cannot call static method on type parameter, even with class constraint
- Qt - 警告"warning: type qualifiers ignored on function return type"
- 警告"warning: type qualifiers ignored on function return type"
- Why the "volatile" type class should not be used
- Error: non-generic cannot be used with type arguments
- Refactor: replace type code with class (c++)
- warning C4251: 'vectortemp::m_Vector' : class 'std::vector' needs to have dll-interface to be used by clients of class 'vectorte
- Linq 中查询一个表中指定的字段
- HDU How many days?
- 拆解Google Play Services 4.4,猜想Google I/O 2014的新动向,Android Wear支持等
- DBArtisan 8.5.4 中文乱码解决办法
- android 工具类 数据库管理
- warning C4541: 'dynamic_cast' used on polymorphic type 'class MyObject' with /GR-; unpredictable beh
- Java中的Enum用法介绍
- Project 2013项目管理教程(2):project基础操作概述
- [行情]雅阁降价促销 重庆现购车优惠1.2万元
- VS2013自带报表+打印功能
- android SDK sample说明
- gitHub使用SVN commit时报错 “svn mkcol not allowed”
- Project 2013项目管理教程(3):建立任务间的依赖性
- 上海明奕担保公司办信用卡怎么样?