Is it possible to access the std::for_each iterator, so I can erase the current element from an std::list using a lambda (as below)
typedef std::shared_ptr<IEvent> EventPtr;
std::list<EventPtr> EventQueue;
EventType evt;
...
std::for_each(
EventQueue.begin(), EventQueue.end(),
[&]( EventPtr pEvent )
{
if( pEvent->EventType() == evt.EventType() )
EventQueue.erase( ???Iterator??? );
}
);
I've read about using [](typename T::value_type x){ delete x; } here on SO, but VS2010 doesn't seem to like this statement (underlines T as error source).
You are using the wrong algorithm. Use remove_if
:
EventQueue.remove_if([&](EventPtr const& pEvent)
{
return pEvent->EventType() == evt.EventType();
});
The STL algorithms do not give you access to the iterator being used for iteration. This is in most cases a good thing.
(In addition, consider whether you really want to use std::list
; it's unlikely that it is the right container for your use case. Consider std::vector
, with which you would use the erase/remove idiom to remove elements that satisfy a particular predicate.)