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POHow to do an efficient priority update in STL priority_queue?
 

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  1. POHow to do an efficient priority update in STL priority_queue?
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    <p>I have a priority_queue of some object:</p> <pre><code>typedef priority_queue&lt;Object&gt; Queue; Queue queue; </code></pre> <p>From time to time, the priority of one of the objects may change - I need to be able to update the priority of that object in the queue in an efficient way. Currently I am using this method which works but seems inefficient:</p> <pre><code>Queue newQueue; while (!queue.empty()) { Object obj=queue.top(); queue.pop(); if (priorityHasChanged(obj)) newQueue.push_back(Object(new_priority)); else newQueue.push_back(obj); } newQueue.swap(queue); // this only works because I actually subclassed the priority_queue // class and exposed a swap method that swaps in the container </code></pre> <p>I implemented it this way because I was in kind of a hurry at the time and this was the quickest thing I could do that I could be sure it would work ok. There has to be a better way than this though. Really what I want is a way to either:</p> <ul> <li>extract out the instance with the changed priority and insert a new one with the new priority value</li> <li>update the instance with the changed priority and then update the queue so that it is correctly sorted</li> </ul> <p>What is the best way to do this?</p>
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