Thread: Triple structure

  1. 06-23-2009 #1
    dpp
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    Triple structure

    Is there an structure to hold triples...
    i know we have stl pair to hold pairs...
    But i am in need of structure storing triples
  2. 06-23-2009 #2
    laserlight
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    Quote Originally Posted by dpp
    Is there an structure to hold triples...
    i know we have stl pair to hold pairs...
    But i am in need of structure storing triples
    You could consider Boost.Tuple.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
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  3. 06-23-2009 #3
    dpp
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    Is there any other approach without using such boost libararies...

    I am not allowed to do that
  4. 06-23-2009 #4
    laserlight
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    Quote Originally Posted by dpp
    Is there any other approach without using such boost libararies...
    Define such a triple structure yourself.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
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  5. 06-23-2009 #5
    dpp
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    yes i ll do that in the worst case
    But all i needed to know was whether there exist a similar one like "pair" or can a few combinations of someother structures would land up in triple...
    hope there is not
  6. 06-23-2009 #6
    ಠ_ಠ
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    It's not complicated, just write your own
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  7. 06-23-2009 #7
    dpp
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    yes it is easy...
    But all i wanted is triple in the priority queue
    Code:
     priority_queue<int,vector<int>, compare > pq;
    is the minimal one..,.

    I used pairs to hold doubles...
    Now i am running short of options to hold triples
  8. 06-23-2009 #8
    legit
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    Like everyone has said, create your own templated class and work from there.
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  9. 06-23-2009 #9
    matsp
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    How about
    Code:
    pair < T1, pair < T2, T3 > >
    ?

    --
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  10. 06-23-2009 #10
    legit
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    Quote Originally Posted by matsp View Post
    How about
    Code:
    pair < T1, pair < T2, T3 > >
    ?
    Wow, I never thought of a pair inside a pair! Nice.
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  11. 06-23-2009 #11
    laserlight
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    The bad part about simulating a triple with a pair that contains a pair as the second object is that accessing the second and third objects would involve syntax such as x.second.first and x.second.second as opposed to x.second and x.third (or in the case of Boost.Tuple, x.get<1>() and x.get<2>()).
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way
  12. 06-23-2009 #12
    matsp
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    Quote Originally Posted by laserlight View Post
    The bad part about simulating a triple with a pair that contains a pair as the second object is that accessing the second and third objects would involve syntax such as x.second.first and x.second.second as opposed to x.second and x.third (or in the case of Boost.Tuple, x.get<1>() and x.get<2>()).
    Sure, it's not very nice. I'm not convinced the tuple solution is much nicer, really.

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  13. 06-23-2009 #13
    m37h0d
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    Code:
    template<typename T1,typename T2,typename T3>triple
{
public:
    triple(const T1 &t1,const T2 &t2,const T3 &t3):
        first(t1),
        second(t2),
        third(t3)
    {
    }
    T1 first;
    T2 second;
    T3 third;
};


    i'll leave it to you to figure out how to specialize (or de-optimize) if you want to store indirect types in your triple.
  14. 06-25-2009 #14
    dpp
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    But i successfully simulated using pairs... Infact i started to do with pairs and achieved what i wanted...
    When i got back to the forum ,I saw matsp has given exactly the method which i worked with...
    Not sure about its efficiency...But it was all needed for me
    Cheers Matsp
    Thanks evryone anyways
    Last edited by dpp; 06-25-2009 at 11:51 PM.
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