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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. class ClassB
  5. {
  6. public:
  7.     void SetThingie(const std::string &str);
  8.     void DoSomething(float f, int i);
  9. };
  10.  
  11. class ClassA
  12. {
  13. public:
  14. 	ClassA(int objCount)
  15. 	{
  16. 		this->objects.resize(objCount);
  17. 	}
  18.  
  19. 	template<typename MemberFunc, typename ...Args>
  20. 	typename std::enable_if<std::is_member_function_pointer<MemberFunc>::value, void>::type
  21.     CallMemberFuncOnObjects(MemberFunc memberFunc, Args&& ...args)
  22.     {
  23.     	int id = 0;
  24.  
  25.     	for(auto &object : this->objects)
  26.     	{
  27.     		std::cout << "ClassB #" << ++id << " = ";
  28.     		(object.*memberFunc)( args... );
  29.     	}
  30.  
  31.     	std::cout << std::endl;
  32.     }
  33.  
  34. private:
  35.     std::vector<ClassB> objects;
  36. };
  37.  
  38. void ClassB::SetThingie(const std::string &str)
  39. {
  40.     std::cout << str << std::endl;
  41. }
  42.  
  43. void ClassB::DoSomething(float f, int i)
  44. {
  45. 	std::cout << "(" << f << ", " << i << ")" << std::endl;
  46. }
  47.  
  48. int main()
  49. {
  50. 	ClassA myClassA(5);
  51.  
  52. 	myClassA.CallMemberFuncOnObjects(&ClassB::SetThingie, "Hello world!");
  53. 	myClassA.CallMemberFuncOnObjects(&ClassB::DoSomething, 3.14f, 357);
  54.  
  55. 	return 0;
  56. }
Success #stdin #stdout 0s 3432KB
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stdin
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Standard input is empty
stdout
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ClassB #1 = Hello world!
ClassB #2 = Hello world!
ClassB #3 = Hello world!
ClassB #4 = Hello world!
ClassB #5 = Hello world!

ClassB #1 = (3.14, 357)
ClassB #2 = (3.14, 357)
ClassB #3 = (3.14, 357)
ClassB #4 = (3.14, 357)
ClassB #5 = (3.14, 357)
https://ideone.com/zykw4w
Calling arbitrary member functions on an array of objects.
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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