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  1. #include <iostream>
  2. #include <set>
  3. #include <vector>
  4.  
  5. struct A
  6. {
  7.     int member[10] {1,5,7,2,3,8,4,9,6,0};
  8.     std::vector<std::size_t> another_member {5,6,7,8,9,0,1,2,3,4} ;
  9. };
  10.  
  11. template < typename ORDER > struct order_compare
  12. {
  13.     order_compare( const ORDER& a ) : order(a) {}
  14.  
  15.     bool operator() (const int lhs, const int rhs) const
  16.     { return order[lhs] < order[rhs] ; }
  17.  
  18.     const ORDER& order ;
  19. };
  20.  
  21. int main()
  22. {
  23.     A object ;
  24.  
  25.     {
  26.         std::set< int, order_compare< int[10] > > s( object.member ) ;
  27.         for( int i=0 ; i<10 ; ++i ) s.insert(i);
  28.  
  29.         for( int v : s ) std::cout << v << ' ' ;
  30.         std::cout << '\n' ;
  31.     }
  32.  
  33.     {
  34.         std::set< int, order_compare< std::vector<std::size_t> > > s( object.another_member ) ;
  35.         for( int i=0 ; i<10 ; ++i ) s.insert(i);
  36.  
  37.         for( int v : s ) std::cout << v << ' ' ;
  38.         std::cout << '\n' ;
  39.     }
  40. }
  41.  
Success #stdin #stdout 0s 2988KB
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stdin
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Standard input is empty
stdout
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9 0 3 4 6 1 8 2 5 7 
5 6 7 8 9 0 1 2 3 4
https://ideone.com/K4Dr0F
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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