Hashset equilalent of C++
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Thread: Hashset equilalent of C++

  1. #1
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    Hashset equilalent of C++

    What is the equivalent of HashSet in C++? How do I use it (as in basic add, remove, and iterating through)

  2. #2
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    Re: Hashset equilalent of C++

    At the moment, my guess is that it would be std::tr1::unordered_set, but being part of the TR1 extensions, it may not necessarily be available.

    For the time being, you could use Boost.Unordered, which provided the basis for the unordered containers in TR1. Boost provides a TR1 wrapper too.
    Last edited by laserlight; April 13th, 2010 at 10:06 AM. Reason: Oops, missed the tr1 namespace
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  3. #3
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    Re: Hashset equilalent of C++

    Quote Originally Posted by dietao234 View Post
    What is the equivalent of HashSet in C++? How do I use it (as in basic add, remove, and iterating through)
    HashSet of Java?

    There is no equivalent yet but one is planned for the upcoming new C++ standard. Many compiler suppliers offer it already. It's called std::tr1::unordered_set.

  4. #4
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    Re: Hashset equilalent of C++

    From what language?

    c++ has std::set/std::map, which is (usually) implemented as a binary tree (red/black tree as a matter of fact).

    boost has a boost::hash_set/boost::hash_map which is basically the same thing, but implemented as a hash structure. This will be implemented into c++ as "std::::tr1::unordered_set" and "std::::tr1::unordered_map". Boost's structure has been renamed a a consequence.

    As for how to use them, maybe the best thing for you to do is to google these structures and come back if you have any questions? I can answer any of your questions, but there are better tutorials out there then I can type right now.

    http://www.cplusplus.com/reference/stl/set/
    http://www.cplusplus.com/reference/stl/map/
    http://www.boost.org/doc/libs/1_36_0...unordered.html

    Hope that helps?

  5. #5
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    Re: Hashset equilalent of C++

    Quote Originally Posted by monarch_dodra View Post
    c++ has std::set/std::map,
    The Java equivalents of these are TreeSet and TreeMap respectively.

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