Questions about looking for a given data structure (or a library to do a very specific task) are usually left open on Stack Overflow, even though they have no definitive answer, because it is such a common task applicable to many programmers. I can't even count the number of times an SO question has saved me hours of research looking for the right library.
Yet, this 4-1/2 year old question, with 68 upvotes, has been closed. This upsets me because, when I was looking for a C# priority queue, this page was a better resource than the other first top 20 results on google combined!
And now that it's closed, links to newer and better priority queue implementations can no longer be posted†. In essence, by closing that question we are forcibly causing it to be stale and outdated. That is not good for anyone, especially when that link is the top result on google.
Can we please have this question reopened? More importantly, can we get a specific ruling stating that these sorts of question should be allowed since, despite having no definitive answer, they are some of the most useful on-topic questions on the site?
† Disclosure: I recently wrote a priority queue implementation which I believe could help a lot of people