Re: [boost] singleton: zombie_call

27 Jul 2005


      Jason Hise wrote:
...
I am trying to come up with a mechanism which allows member functions
of
the singleton to be called if the instance exists, and which do
nothing
if the instance does not exist (no creation is attempted, the
operation
is simply skipped).  My current idea is a member function of the
singleton pointer named zombie_call, which would be used something
like:
ptr.zombie_call ( &MySingletonType::SomeFunc, param1, param2, ... );
The only problem I have is what to do if the instance does not exist
and
the member function has a return value.
Use Boost.Optional:

http://www.boost.org/libs/optional/doc/optional.html

HTH

Fernando Cacciola
SciSoft