Re: [Boost-users] Priority deque?

Subject: Re: [Boost-users] Priority deque?
From: Michael (mwpowellhtx_at_[hidden])
Date: 2016-09-01 09:51:20

On September 1, 2016 9:34:03 AM EDT, Paolo Bolzoni <paolo.bolzoni.brown_at_[hidden]> wrote:
>Oh, dear. I made a stupid mistake. I meant a "priority deque", a data
>structure where you can easily access the maximum and minimum element.
>In priority queue you can top and pop the maximum element, I would
>need both to pop and top the maximum and the minimum.

I understood your meaning.

The generally recommend approach is use a std::vector in combination with one of the search algorithms for insertion purposes. If you absolutely have to, use sort. In either case the insertion times will naturally suffer. There are many examples of this.

It would be simple to write a push/pop front/back for that.

HTH

>On Thu, Sep 1, 2016 at 3:34 PM, Michael <mwpowellhtx_at_[hidden]> wrote:
>>
>>
>> On September 1, 2016 4:55:38 AM EDT, Paolo Bolzoni
><paolo.bolzoni.brown_at_[hidden]> wrote:
>>>Dear list,
>>>
>>>I was wondering if there some kind of "priority queue", that is a
>data
>>>structure akin the priority queue, but where you can top and pop from
>>>both sides.
>>>My use case is that I need to quickly access the maximum, but also
>not
>>>push new elements if they are smaller than the minimum.
>>
>> Deque is one of my favorites. Ordered? Unordered?
>>
>>>I am aware I can use a std::set, but in the current implementation
>>>where I always push new elements even if they are bad, using a
>>>std::set the performance is significantly worse.
>>
>> I'm not sure set is the same thing as an ordered anything (list,
>vector, queue, deque).
>>
>>>Yours faithfully,
>>>Paolo
>>
>> Regards,
>>
>> Michael Powell
>>
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>>
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Sent from my Android device with K-9 Mail. Please excuse my brevity.