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  1. #include <iostream>
  2.  
  3. namespace operators
  4. {
  5. 	template <class Fun>
  6. 	struct composer
  7. 	{
  8. 		Fun fun;	
  9. 	};
  10.  
  11. 	struct compose_t {} compose;
  12.  
  13. 	template <class Fun>
  14. 	composer<Fun> operator < (Fun fun, compose_t) { return {fun}; }
  15.  
  16. 	template <class Fun1, class Fun2>
  17. 	decltype(auto) operator > (composer<Fun1> comp1, Fun2 fun2) { 
  18. 		return [=](auto... v) { 
  19. 			return fun2(comp1.fun(std::forward<decltype(v)>(v)...));
  20. 		};
  21. 	}
  22. }
  23.  
  24. struct filter {
  25. 	float operator()(float v) { return v; }
  26. };
  27.  
  28. struct envelope {
  29. 	void set_slider1(float v) {}
  30. 	void set_slider2(float v) {}
  31. 	void set_slider3(float v) {}
  32. };
  33.  
  34. int main() {
  35. 	using namespace operators;
  36.  
  37. 	auto composed = [](float v) { return v * 2; } <compose> 
  38. 					[](float v) { return v / 2; } <compose>
  39. 					[](float v) { return v * v; };
  40.  
  41. 	std::cout << composed(10.f) << std::endl;
  42. 	return 0;
  43. }
Success #stdin #stdout 0s 4476KB
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https://ideone.com/oDYZjU
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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