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  1. #include <iostream>
  2. #include <vector>
  3. #include <functional>
  4. #include <algorithm>
  5. using namespace std;
  6. template <typename Container, typename F>
  7. Container Map(F f, Container xs )
  8. {
  9.     Container ys;
  10.     auto it = std::inserter( ys, end( ys ) );
  11.     std::transform( begin( xs ), end( xs ), it, f );
  12.     return ys;
  13. }
  14. template <typename Ret, typename Arg1, typename... Args>
  15.   auto Curry(Ret (*f)(Arg1, Args...),  Arg1 arg ) -> std::function<Ret(Args...)>
  16. {
  17.     return [=]( Args... args ) { return f( arg, args... ); };
  18. }
  19. int main() 
  20. {
  21. 	auto square = [](int x){ return x*x; };
  22.  
  23.   typedef std::vector<int> Row;
  24.   Row row = {1, 2 , 3};
  25.   Row squaredRow = Map(square, row);
  26.  
  27.   typedef std::vector<Row> Mat;
  28.   Mat mat = {{1,2},{2,3,4}};
  29.   auto squareElements = Curry(Map<Row, decltype(square)>, square);
  30.   Mat squaredMat = Map(squareElements, mat);
  31.  
  32. 	return 0;
  33. }
Success #stdin #stdout 0s 3412KB
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https://ideone.com/KQYVla
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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