Am 18.08.2014 14:49, schrieb monarch_dodra:
On Monday, 18 August 2014 at 06:50:08 UTC, Paulo Pinto wrote:
On Sunday, 17 August 2014 at 21:09:04 UTC, monarch_dodra wrote:
On Sunday, 17 August 2014 at 18:54:27 UTC, Paulo Pinto wrote:
Hi,
I was wondering if it is possible to use the BinaryHeap store like
the C++'s make_heap/pop_heap/push_heap functions.
I would like to port to D some A* C++ code I have which rearranges
the priorities on the underlying store, followed by another
make_heap() call on the vector used as store.
Doing the same in D by calling again heapify() does not seem to
provide similar behavior.
Just curious about it, as I don't plan to invest too much time on it.
Thanks,
Paulo
AFAIK, D's BinaryHeap works just like C++'s
make_heap/pop_heap/push_heap, except that it provides an actual
object you can interface with, which has font, removeFront, removeAny
and insert.
What exactly is the difference in behavior you are seeing? Just
different results that can be attributed to implementation details,
or fundamental differences?
It doesn't seem to like I change the store contents directly under its
feet
and recalling heapify again on the same store, like I am doing in
C++'s heap.
Sometimes I get a different sequence of data or just a crash.
I still need to make the D code reflect my latest C++ changes, as the
C++ code is what really matters in this hobby project, there is where
my focus has been lately.
The D version is more of a "playing around" thing.
As I said, I curious what the behavior is supposed to be.
Thanks,
Paulo
Weird. The behavior should be the same as C++'s. As I said, the
difference is that D gives you a "handle" object. This object assumes
you *don't* modify it's store under the hood, but as long as you don't
use the heap after a store modification, you should be fine. Do you have
a minimal test case?
Actually, that is exactly what I am doing. :)
The store contains the open list of nodes to visit, and when new paths
are found, I re-parent the nodes which leads to a different cost, thus
I re-generate the heap.
The D code is still not up to date with what I am doing on C++ and the
code I had before lost it somehow while jumping around computers. But
both projects are on Github.
C++
https://github.com/pjmlp/AStarDemoCpp/blob/master/AStarDemo/AStarSolver.cpp
D
https://github.com/pjmlp/AStarDemoD/blob/master/src/solver.d
--
Paulo
