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  1. #include <iostream>
  2. #include <vector>
  3. #include <functional>
  4. #include <unordered_map>
  5.  
  6. namespace app {
  7. 	using model = std::vector<int>;
  8.  
  9. 	namespace controller {
  10. 		void push(app::model &model, model::value_type val) {
  11. 			model.emplace_back(val);
  12. 		}
  13.  
  14. 		bool pop(app::model &model) {
  15. 			if(model.size()) {
  16. 				model.pop_back();
  17. 				return true;
  18. 			}
  19. 			return false;
  20. 		}
  21. 	}
  22.  
  23. 	namespace view {
  24. 		void all(app::model const &model) {
  25. 			std::cout << "[ ";
  26. 			for(auto el: model) {
  27. 				std::cout << el << " ";
  28. 			}
  29. 			std::cout << "]" << std::endl;
  30. 		}
  31.  
  32. 		void push(app::model &m) {
  33. 			model::value_type val;
  34. 			std::cin >> val;
  35. 			controller::push(m, val);
  36. 		}
  37.  
  38. 		void pop(model &m) {
  39. 			if(!controller::pop(m)) {
  40. 				std::cout << "cannot pop from empty collection." << std::endl;
  41. 			}
  42. 		}
  43. 	}
  44. }
  45.  
  46. namespace routes {
  47. 	using route = std::string;
  48. 	using handler = std::function<void()>;
  49. 	using router = std::unordered_map<route, handler>;
  50. }
  51.  
  52. int main() {
  53. 	app::model model;
  54.  
  55. 	routes::router const router = {
  56. 		{"all",  [&]{ app::view::all(model); }},
  57. 		{"push", [&]{ app::view::push(model); }},
  58. 		{"pop",  [&]{ app::view::pop(model); }}
  59. 	};
  60.  
  61. 	routes::route route;
  62. 	while(std::cin >> route) {
  63. 		if(router.count(route)) {
  64. 			router.at(route)();
  65. 		}
  66. 		else {
  67. 			std::cout << "invalid route!" << std::endl;
  68. 		}
  69. 	}
  70. 	return 0;
  71. }
Success #stdin #stdout 0s 3468KB
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all
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[ ]
[ 1 ]
[ ]
invalid route!
[ 1 2 3 ]
cannot pop from empty collection.
https://ideone.com/FF37KW
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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