Re: Question about singleton class design for tracing

Stephen Torri <>
Thu, 24 May 2007 18:38:27 GMT
On Thu, 24 May 2007 02:36:44 -0700, James Kanze wrote:

        static Trace_State& Instance()
            if ( m_instance == 0 )
                    m_instance = new Trace_State();
            return *m_instance;

I'd prefer declare m_instance as static variable in this function, and
of course initiate it :)

This has the disadvantage that the destructor will be called,
potentially leading to order of destruction issues.

Right now I am trying to track down a segfault that occurs in my program.
I find the segfault always has my tracing class as the last point in my
program where control goes through before heading into the STL code. If I
comment out that use of the tracing library then the segfault at that
location disappears. It will occur at the next location using the tracing
library. So I believe the problem is the tracing library design as a
singleton. How can I create a singleton that will not suffer from the
"order of destruction" issue?

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