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  1. #include <algorithm>
  2. #include <iostream>
  3. #include <iterator>
  4. #include <list>
  5. #include <map>
  6. #include <string>
  7.  
  8. typedef std::pair<int, std::string> InputPair;
  9. typedef std::map<int, std::string> InputContainer;
  10. typedef std::list<std::string> OutputContainer;
  11.  
  12. void copyPart_Ver1( OutputContainer& oc, const InputContainer& ic )
  13. {
  14. 	for( InputContainer::const_iterator it=ic.begin(); it!=ic.end(); ++it )
  15. 	{
  16. 		oc.push_back(it->second);
  17. 	}
  18. }
  19.  
  20. struct TakeSecond
  21. {
  22. 	std::string operator()( const InputPair& p ) const
  23. 	{
  24. 		return p.second;
  25. 	}
  26. };
  27.  
  28. void copyPart_Ver2( OutputContainer& oc, const InputContainer& ic )
  29. {
  30. 	std::transform(ic.begin(), ic.end(), std::back_inserter(oc), TakeSecond() );
  31. }
  32.  
  33. int main() {
  34.  
  35. 	InputContainer ic;
  36.  
  37. 	ic[1] = "one";
  38. 	ic[2] = "two";
  39.  
  40. 	std::ostream_iterator<std::string> oi( std::cout, " " );
  41.  
  42. 	OutputContainer oc1;
  43. 	copyPart_Ver1( oc1, ic );
  44. 	std::copy( oc1.begin(), oc1.end(), oi );
  45. 	std::cout << std::endl;
  46.  
  47. 	OutputContainer oc2;
  48. 	copyPart_Ver2( oc2, ic );
  49. 	std::copy( oc2.begin(), oc2.end(), oi );	
  50. 	std::cout << std::endl;
  51.  
  52. 	return 0;
  53. }
Success #stdin #stdout 0s 3432KB
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stdin
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Standard input is empty
stdout
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one two 
one two
https://ideone.com/Gx8VoF
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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