Re: Logging in templates?

I don't think the problem is unsurmountable, but I haven't tried it 
myself.  I'm just freehanding the following code, but maybe it will 
help you get started and you can post back to the list what works for 
you.

I think you'd so something like:

template <class T> class Example {
      Example() {}
      void doSomething() {
            LOG4CXX_DEBUG(getLogger(), "Hello, World");
      }

private:
       log4cxx::LoggerRef& getLogger() {
            static log4cxx::LoggerRef logger(log4cxx::Logger::getLogger(
                LOG4CXX_LOCATION.getClassName()));
            return logger;
      }
};

The code fragment depends on the LocationInfo class introduced after 
0.9.7 to get the class name.  The class name may be returned as "" for 
early Microsoft compilers ( _MSC_VER < 1300).  Please feel free to 
enhance include/log4cxx/spi/location/locationinfo.h if your compiler 
can return class location but the macros don't handle it.


On Jan 30, 2005, at 10:51 AM, Daniel Einspanjer wrote:

> Does no one else have a problem with needing to log messages from
> templated classes?  If anyone else has solved this problem, I would
> very much like to hear your solution.
>
> Thanks,
> Daniel
>
>
> On Thu, 20 Jan 2005 15:51:41 -0500, Daniel Einspanjer
> <deinspanjer@xxxxxxxxx> wrote:
> > Could anyone share their methods for logging within a templated class?
> >
> > Specifically, the problem I don't have a good solution for is the
> > static instantiation of a logger object at all, let alone one that has
> > a name giving the particular class for which the template is being
> > used.