conduit-fib.cpp

auto fibonacci = []() -> seq<unsigned long long> {
  auto a = 0ll; 
  auto b = 1ll;
  
  while (true) {
    co_yield a;
    
    tie(a, b) = tuple{a + b, a};
  }
};

static long N = 50;

int main() {
  auto n = N;
  auto items = fibonacci() 
    >> drop(n - 10)
    >> take(n);
  unsigned long long result = 0;
  
  for (auto x : items) {
    result += x;
  }
  
  return result;
}