Re: [boost] [graph][heap][coroutine] interruptable dijkstra shortest path function

Subject: Re: [boost] [graph][heap][coroutine] interruptable dijkstra shortest path function
From: Rob Stewart (robertstewart_at_[hidden])
Date: 2012-09-24 09:25:30

On Sep 24, 2012, at 7:07 AM, Alex Hagen-Zanker <ahh34_at_[hidden]> wrote:

> I am just interested to see the fundamental difference between the Boost.Graph d_ary_heap and Boost.Heap d_ary_heap. Because the statement that Graph is optimized for integer values does not seem correct. I noticed that Graph manages the handles through an array and Heap through a std::list and considered that there might be some difference in performance because of that.
> 
> Probably the difference is minute, but at the same time it is the only place where I see that Graph makes an assumption (the total number of values pushed onto the heap is known) that Heap cannot make.

Locality of reference and a single free store allocation are sufficient reasons for Graph's implementation to be faster. Perhaps a deque would be better than a list for Heap.

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Rob