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  1. 	#include <iostream>
  2. 	#include <vector>
  3. 	using namespace std;
  4.  
  5.     struct TaskInterface {
  6.         virtual void Do() = 0;
  7.         virtual ~TaskInterface() {}
  8.     };
  9.  
  10.     template<class Impl>
  11.     class TaskBase 
  12.     : public TaskInterface {
  13.         virtual void Do() {
  14.             DoDerivedImpl();
  15.         }
  16.     protected:
  17.         void DoDerivedImpl() {
  18.             static_cast<Impl*>(this)->DoImpl();
  19.         }
  20.  
  21.         void DoImpl() {
  22.              // Issue a static_assert error here, that there's no appropriate overridden
  23.              // implementation of DoImpl() available:
  24.              static_assert(static_cast<Impl*>(this)->DoImpl != TaskBase<Impl>::DoImpl, "TaskBase requires an appropriate implementation of DoImpl()");
  25.         }
  26.     };
  27.  
  28.     class TaskType1 : public TaskBase<TaskType1> {
  29.     public:
  30.         void DoImpl() {
  31.             cout << "TaskType1::DoImpl()" << endl;
  32.         }
  33.     };
  34.  
  35.     class TaskType2 : public TaskBase<TaskType2> {
  36.     public:
  37.         void DoImpl() {
  38.             cout << "TaskType2::DoImpl()" << endl;
  39.         }
  40.     };
  41.  
  42. 	int main() {
  43. 	    std::vector<TaskInterface*> tasks;
  44. 	    TaskType1 t1;
  45. 	    TaskType2 t2;
  46. 	    tasks.push_back(&t1);
  47. 	    tasks.push_back(&t2);
  48.  
  49. 	    for(std::vector<TaskInterface*>::iterator it = tasks.begin();
  50. 	        it != tasks.end();
  51. 	        ++it) {
  52. 	        	(*it)->Do();
  53.         }
  54. 	}
Success #stdin #stdout 0s 3432KB
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stdin
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Standard input is empty
stdout
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TaskType1::DoImpl()
TaskType2::DoImpl()
https://ideone.com/60kqce
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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