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  1. #include <iostream>
  2.  
  3. #include <iostream>
  4. #include <map>
  5.  
  6. template<class Iter, class F>
  7. void apply( Iter begin, Iter end, F f, bool forward )
  8. {
  9.     while( begin != end ) 
  10.         f( forward ? *begin++ : *--end );
  11. }
  12.  
  13. int main()
  14. {
  15.     const bool descend = false;
  16.  
  17.     std::map<int, int> mapp;
  18.     mapp[1] = 1;
  19.     mapp[2] = 2;
  20.     mapp[3] = 3;
  21.     mapp[4] = 4;
  22.  
  23.     auto print = []( const auto &p ) { std::cout << p.first << " "; };
  24.     apply( mapp.begin(), mapp.end(), print, true );
  25.     std::cout << std::endl;
  26.     apply( mapp.begin(), mapp.end(), print, false );
  27.     std::cout << std::endl;
  28. }
  29.  
  30.  
Success #stdin #stdout 0s 4332KB
comments (?)
stdin 
Standard input is empty
stdout 
1 2 3 4 
4 3 2 1
https://ideone.com/t3mWis
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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