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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. template < typename Cont, typename Filt, typename Tran >
  5. auto filter( Cont& cnt, Filt func, Tran tran ) -> std::vector< decltype( tran(cnt[0] ) ) >
  6. {
  7.   std::vector< decltype( tran( cnt[0] ) ) > ret;
  8.   for ( auto& item : cnt ) if ( func( item ) ) ret.push_back( tran( item ) );
  9.   return ret;
  10. }
  11.  
  12. int main( void )
  13. {
  14.   std::vector< int > numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
  15.  
  16.   auto is_odd = []( const int x ) { return x % 2 == 1; };
  17.  
  18.   auto transform = []( int& x ){ return &x; };
  19.  
  20.   auto odd_numbers = filter( numbers, is_odd, transform );
  21.  
  22.   for ( const auto& odd_number : odd_numbers )
  23.     std::cout << *odd_number << '\n';
  24. }
Success #stdin #stdout 0s 3428KB
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https://ideone.com/qfVaqe
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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