// If, at any point (in user code), Singleton<T>::instance()
// is called, then the following function is instantiated.
static void do_initialize()
{
// call the static function
T::initialize();
// The following line does nothing else than force the instantiation
// of Singleton<T>::create_object, whose constructor is
// called before main() begins.
create_object.do_nothing();
}
// If, at any point (in user code), singleton_default<T>::instance()
// is called, then the following function is instantiated.
static object_type & instance()
{
// This is the object that we return a reference to.
// It is guaranteed to be created before main() begins because of
// the next line.
static object_type obj;
// The following line does nothing else than force the instantiation
// of singleton_default<T>::create_object, whose constructor is
// called before main() begins.
create_object.do_nothing();
return obj;
}
static object_type & instance() {
static object_type obj;
create_object.do_nothing();
return obj;
}
