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Thread: Sorting for equal_range()

  1. #1
    Join Date
    Oct 2010
    Posts
    119

    Sorting for equal_range()

    Hello all

    I am using 3 vectors each of which is of type struct "ABC". I am trying to find duplicates in each vector using equal_range() method. In order for equal_range() to work, the vectors must be sorted. The criteria for sorting each vector is different, therefore, I can't write a single sort method inside the struct "ABC". Is there any way to write different methods for sorting, one for each vector?

    Many Thanks

    Code:
    // sort algorithm example
    #include <iostream>
    #include <algorithm>
    #include <vector>
    using namespace std;
    
    struct mystruct {
    string a;
    string b;
    string c;
    string d;
    string e;
    };
    
    Sort function-1 (does it not have to have some relevance to struct mystruct?)
    {
        On basis of variables a, b and c
    }
    
    Sort function-2 (does it not have to have some relevance to struct mystruct?)
    {
        On basis of variables a, d and e
    }
    
    Sort function-3 (does it not have to have some relevance to struct mystruct?)
    {
        On basis of variables b, c and d
    }
    
    int main () {
      
      vector< mystruct > myvector1;
      vector< mystruct >::iterator it1;
    
      sort (myvector1.begin(), myvector1.end(),Sort function-1);
    
      vector< mystruct > myvector2;
      vector< mystruct >::iterator it2;
    
      sort (myvector2.begin(), myvector2.end(),Sort function-2);
    
      vector< mystruct > myvector3;
      vector< mystruct >::iterator it3;
    
      sort (myvector3.begin(), myvector3.end(),Sort function-3);
    
      return 0;
    }

  2. #2
    Join Date
    Dec 2007
    Posts
    401
    Use the version of std::sort() which takes a predicate, with a different predicate for each of the three vectors.
    See: http://www.codeproject.com/KB/cpp/Sort.aspx

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