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  1. #include <iostream>
  2. #include <vector>
  3. #include <memory>
  4. using namespace std;
  5.  
  6. //************* Definitions
  7. class OtherClass;
  8.  
  9. class Command {
  10. public: 
  11.     virtual void execute() = 0; 
  12.     virtual ~Command();
  13. }; 
  14. class CommandOtherClass : public Command { 
  15.     OtherClass *target; 
  16.     void (OtherClass::*f)(); 
  17. public: 
  18.     CommandOtherClass (void (OtherClass::*fct)(), OtherClass*t); 
  19.     void execute() override; 
  20. };
  21. class CommandAdHoc : public Command { 
  22. public: 
  23.     void execute() override; 
  24. };
  25. class SomeClass {
  26. public:
  27.     static std::vector<unique_ptr<Command>> UpdateFuncs;
  28.     static void executeAll();
  29. };
  30.  
  31. class OtherClass{
  32. private:
  33.     void Update();
  34. public:
  35.     OtherClass();
  36. };
  37.  
  38. //*************** Implementation
  39.  
  40. std::vector<unique_ptr<Command>> SomeClass::UpdateFuncs;
  41. Command::~Command() {}
  42. CommandOtherClass::CommandOtherClass (void (OtherClass::*fct)(), OtherClass*t) 
  43.     :  f(fct),target(t)
  44. {
  45. } 
  46. void CommandOtherClass::execute() {
  47. 	(target->*f)();
  48. }
  49. void CommandAdHoc::execute() {
  50. 	cout<<"Taht's all folks :-) !"<<endl;
  51. }
  52.  
  53. void SomeClass::executeAll() {
  54.     for (auto &x:UpdateFuncs) 
  55.         x->execute(); 
  56. }
  57. OtherClass::OtherClass() {
  58.     SomeClass::UpdateFuncs.push_back(make_unique<CommandOtherClass>(&OtherClass::Update, this));
  59. }
  60. void OtherClass::Update() {
  61.     cout << "Hello, world, said by "<<this<<endl;
  62. }
  63.  
  64. int main() {
  65.     OtherClass a,b; 
  66.     SomeClass::UpdateFuncs.push_back(make_unique<CommandAdHoc>());
  67.  
  68.     SomeClass::executeAll(); 
  69.     return 0;
  70. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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Hello, world, said by 0x7ffd88f8ed5e
Hello, world, said by 0x7ffd88f8ed5f
Taht's all folks :-) !
https://ideone.com/xsFdlt
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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