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  1. #include <iostream>
  2. #include <set>
  3.  
  4. template<typename Cont, typename Pred>
  5. void bidir_remove_if( Cont &c, Pred p, bool forward )
  6. {
  7.     auto b = c.begin();
  8.     auto e = c.end();
  9.     while( b != e ) {
  10.        auto it = forward ? b++ : --e;
  11.        if( p(*it) ) {
  12.            auto end = b == e;
  13.            ( forward ? it : e ) = c.erase( it );
  14.            if( end ) break;
  15.        }
  16.     }
  17. }
  18.  
  19. int main()
  20. {
  21.     std::set<int> s1 = { 1,2,3,4,5 };
  22.     auto s2 = s1;
  23.     auto p = []( int i ) {
  24.         std::cout << i << " ";
  25.         return i % 2;
  26.     };
  27.     bidir_remove_if( s1, p, true );
  28.     std::cout << std::endl;
  29.     for( int i : s1 ) std::cout << i << " ";
  30.     std::cout << std::endl;
  31.     bidir_remove_if( s2, p, false );
  32.     std::cout << std::endl;
  33.     for( int i : s2 ) std::cout << i << " ";
  34.     std::cout << std::endl;
  35. }
  36.  
Success #stdin #stdout 0s 4532KB
comments (?)
stdin
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Standard input is empty
stdout
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1 2 3 4 5 
2 4 
5 4 3 2 1 
2 4
https://ideone.com/aXzYSw
language:
C++14 (clang 8.0)
created:
5 years ago
visibility:
public

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