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  1. #include <iostream>
  2. #include <vector>
  3. #include <set>
  4. #include <functional>
  5. #include <iostream>
  6. #include <algorithm>
  7. #include <iterator>
  8.  
  9. using namespace std;
  10.  
  11. template <template<class...> class Collection, typename Lambda, typename Type, typename ...CollectionArgs>
  12. auto map(const Collection<Type, CollectionArgs...> &source, Lambda&& lambda)
  13. 	-> Collection< decltype( lambda(*source.begin()) ) >
  14. {
  15. 	Collection< decltype( lambda(*source.begin()) ) > result;
  16. 	std::transform(source.begin(), source.end(), std::inserter(result, result.end()), lambda);
  17. 	return result;
  18. }
  19.  
  20. int main() {
  21.  
  22. 	std::vector<int> ints = {1,2,3,4,5};
  23. 	std::set<int> int_set = {7,8,9};
  24. 	std::vector<float> floats = map( ints, []( int v) -> float { return v;} );
  25. 	std::set<float> floats2 = map( int_set, []( int v) -> float { return v;} );
  26. 	for( auto & n: floats)
  27. 	{
  28. 		std::cout << n << std::endl;
  29. 	}
  30.  
  31. 	std::cout << "---" << std::endl;
  32. 	for( auto & n: floats2)
  33. 	{
  34. 		std::cout << n << std::endl;
  35. 	}
  36.  
  37. 	return 0;
  38. }
Success #stdin #stdout 0s 5512KB
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https://ideone.com/fQZvKg
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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