Simple LINQ-like library for C++ (POC)

Works with arbitrary containers, std::vector<T> by default

Implemnted Expressions:

• Select
• Take
• GroupBy
• OrderBy
• Flatten
• Where
• Recurrent expression

"First 5 numbers in Fibonacci sequence divisible by 3, squared if even" example:

struct FibState {
    int current;
    int prev;
} starting {1, 0};

for(auto v: 
    RecurrentContainer< FibState >([](const FibState st){
                                      return FibState{st.current+st.prev, st.current};
                                  }, starting)
                                  .Select<int>([](const FibState st){ return st.current; })
                                  .Where([](const int x){ return x%3 == 0; })
                                  .Select<int>([](const int x) {
                                      return x%2 == 0 ? x*x : x;
                                  })
                                  .Take(5))
  {
      std::cout << v << std::endl;
  }

A bit ugly? Probably, but this is what a proof of concept for.

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Moved from private study repository