Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Programming
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Databases
Mail Systems
openSolaris
Eclipse Documentation
Techotopia.com
Virtuatopia.com
Answertopia.com

How To Guides
Virtualization
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Windows
Problem Solutions
Privacy Policy

  




 

 

Thinking in C++ Vol 2 - Practical Programming
Prev Home Next

void pointers

RTTI only works for complete types, meaning that all class information must be available when typeid is used. In particular, it doesn t work with void pointers:

//: C08:VoidRTTI.cpp
// RTTI & void pointers.
//!#include <iostream>
#include <typeinfo>
using namespace std;
 
class Stimpy {
public:
virtual void happy() {}
virtual void joy() {}
virtual ~Stimpy() {}
};
 
int main() {
void* v = new Stimpy;
// Error:
//! Stimpy* s = dynamic_cast<Stimpy*>(v);
// Error:
//! cout << typeid(*v).name() << endl;
} ///:~
 

A void* truly means no type information. [119]

Thinking in C++ Vol 2 - Practical Programming
Prev Home Next

 
 
   Reproduced courtesy of Bruce Eckel, MindView, Inc. Design by Interspire