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  1. #include <iostream>
  2. #include <string>
  3. #include <memory>
  4. #include <unordered_map>
  5. using namespace std;
  6.  
  7. ////////////////////////////////////////////////////////////////
  8. // Manager declaration
  9. ////////////////////////////////////////////////////////////////
  10.  
  11. class manager {
  12. public:
  13. 	class instance;
  14.  
  15. 	instance &get_instance(string name);
  16. 	void print(string sender, string message);
  17.  
  18. private:
  19. 	unordered_map<string, unique_ptr<instance>> m_instances;
  20. };
  21.  
  22. ////////////////////////////////////////////////////////////////
  23. // Instance declaration
  24. ////////////////////////////////////////////////////////////////
  25.  
  26. class manager::instance {
  27. public:
  28. 	instance(string name, manager &manager);
  29. 	void print(string message);
  30.  
  31. private:
  32. 	string m_name;
  33. 	manager &m_manager;
  34. };
  35.  
  36. ////////////////////////////////////////////////////////////////
  37. // Manager implementation
  38. ////////////////////////////////////////////////////////////////
  39.  
  40. manager::instance &manager::get_instance(string name) {
  41. 	if (m_instances.find(name) == m_instances.end())
  42. 		m_instances[name] = unique_ptr<instance>(new instance(name, *this));
  43. 	return *m_instances[name].get();
  44. }
  45.  
  46. void manager::print(string sender, string message) {
  47. 	cout << sender << ": " << message << "." << endl;
  48. }
  49.  
  50. ////////////////////////////////////////////////////////////////
  51. // Instance implementation
  52. ////////////////////////////////////////////////////////////////
  53.  
  54. manager::instance::instance(string name, manager &manager) : m_name(name),
  55. 	m_manager(manager) {}
  56.  
  57. void manager::instance::print(string message) {
  58. 	m_manager.print(m_name, message);
  59. }
  60.  
  61. ////////////////////////////////////////////////////////////////
  62. // Main function
  63. ////////////////////////////////////////////////////////////////
  64.  
  65. int main() {
  66. 	manager m;
  67. 	m.get_instance("Window").print("Open up");
  68. 	m.get_instance("Asset").print("Load textures");
  69. 	return 0;
  70. }
  71.  
Success #stdin #stdout 0s 3480KB
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stdin
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Standard input is empty
stdout
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Window: Open up.
Asset: Load textures.
https://ideone.com/pS7Wbv
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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