const handler_ptr event_handlers::get_event_handler_by_id(const std::string & id) {
id_map_t::iterator find_it = id_map_.find(id);
if ( find_it != id_map_.end() && !find_it->second.expired() ) {
return handler_ptr( find_it->second );
}
return handler_ptr( );
}
/**
* Dereference.
* If the current element has become invalid, we will increment first.
*/
handler_ptr handler_list::iterator::operator*()
{
// Check for an available handler.
while ( iter_.derefable() ) {
// Handler still accessible?
if ( handler_ptr lock = iter_->lock() )
return lock;
else
// Remove the now-defunct entry.
iter_ = list_t::erase(iter_);
}
// End of the list.
return handler_ptr();
}
/**
* Dereference
* Will return a null pointer when the end of the iteration is reached.
*/
handler_ptr manager::iteration::operator*()
{
// Get the candidate for the current element from the main list.
handler_ptr main_ptr = *main_it_;
handler_vec::size_type main_index = ptr_index(main_ptr);
// Get the candidate for the current element from the var list.
handler_ptr var_ptr = *var_it_;
// (Loop while var_ptr would be chosen over main_ptr, but the name does not match.)
while ( var_ptr && var_ptr->index() < main_index &&
!var_ptr->matches_name(event_name_, gamedata_) )
var_ptr = *++var_it_;
handler_vec::size_type var_index = ptr_index(var_ptr);
// Which list? (Index ties go to the main list.)
current_is_known_ = main_index < end_ || var_index < end_;
main_is_current_ = main_index <= var_index;
if ( !current_is_known_ )
return handler_ptr(); // End of list; return a null pointer.
else
return main_is_current_ ? main_ptr : var_ptr;
}
