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  1. #include <algorithm>
  2. #include <functional>
  3. #include <iterator>
  4. #include <utility>
  5. #include <vector>
  6.  
  7. template <typename Container, typename F>
  8. Container Map( const F& f, const Container& xs )
  9. {
  10.     Container ys;
  11.     // For performance reasons one would use
  12.     // ys.reserve( xs.size() )
  13.     // and std::back_inserter instead of std::inserter
  14.     // if ys is a std::vector.
  15.     auto it = std::inserter( ys, end( ys ) );
  16.     std::transform( begin( xs ), end( xs ), it, f );
  17.     return ys;
  18. }
  19.  
  20. template <typename F, typename T>
  21. auto Curry(F&& f, T&& t)
  22. {
  23.     return [f = std::forward<F>(f), t = std::forward<T>(t)]
  24.            (auto&&... args)
  25.            { return f(t, std::forward<decltype(args)>(args)...); };
  26. }
  27.  
  28. int main()
  29. {
  30.     auto square = [](int x){ return x*x; };
  31.  
  32.     typedef std::vector<int> Row;
  33.     Row row;
  34.     Row squaredRow = Map(square, row);
  35.  
  36.     typedef std::vector<Row> Mat;
  37.     Mat mat;
  38.     auto squareRow = Map<Row, decltype(square)>;
  39.     auto squareRowElems = Curry((Map<Row, decltype(square)>), square);
  40.     Mat squaredMat = Map(squareRowElems, mat);
  41. }
Success #stdin #stdout 0s 3412KB
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https://ideone.com/16cx0l
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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