warning: has virtual functions but non-virtual destructor

[Ambarish Mitra <am...@persistent.co.in>]

I have written a small application using log4cxx (log4cxx 0.9.7), the code
snippet is:

   string logpropertiesfile;
   logpropertiesfile="/home/ambarish/appl1/properties.txt";
   PropertyConfigurator::configure(logpropertiesfile);


LOG4CXX_INFO(logger,"================================Initialized============
=====================");


When I compile with g++ -Wall (g++ 3.4.5), I get a lot of warning, all of
the form:


/home/ambarish/log4cxx/include/log4cxx/helpers/class.h:53: warning: `class
log4cxx::helpers::Class' has virtual functions but non-virtual destructor
....
....


Can anyone please provide pointers why these warnings comes? I would think
this is a basic thing in CPP, a class with virtual functions should have a
virtual destructor, otherwise there is a chance of memory leak. Is there a
way to solve this problem from the application perspective?


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Re: warning: has virtual functions but non-virtual destructor

[Curt Arnold <ca...@apache.org>]

On Jul 18, 2006, at 4:40 AM, Ambarish Mitra wrote:

> I have written a small application using log4cxx (log4cxx 0.9.7),  
> the code
> snippet is:
>
>

....

> Can anyone please provide pointers why these warnings comes? I  
> would think
> this is a basic thing in CPP, a class with virtual functions should  
> have a
> virtual destructor, otherwise there is a chance of memory leak. Is  
> there a
> way to solve this problem from the application perspective?
>


Please use the SVN HEAD instead of log4cxx-0.9.7.  Many significant  
bugs have been fixed in the SVN in addition to ~Class being virtual.