Class Calc

test/te.cpp:393–402

};

class Calc {
 public:
  constexpr explicit Calc(const int i = {}) : i_{i} {}

  constexpr auto add(int i) { return i + i_; }
  constexpr auto add(int a, int b) { return (a + b) + i_; }

 private:
  int i_{};
};

test should_support_overloads = [] {
  te::poly<Addable> addable{Calc{2}};