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  1. #include <stdio.h>
  2. #include <initializer_list>
  3. #include <utility>
  4.  
  5. struct A {
  6. 	void operator=(std::initializer_list<int> a){printf("int[%zu]:",a.size());for (auto x:a) printf(" %d",x); printf("\n");}
  7. 	void operator=(float a){printf("float: %.1f\n",a);}
  8. };
  9.  
  10. struct B : A {
  11. 	template <typename T>
  12. 	void _copy(T&& x)
  13. 	{
  14. 		A::operator=(x);
  15. 		printf("+ \n");
  16. 	}
  17.  
  18. 	template <typename T>
  19. 	void operator=(T x) {
  20. 		_copy(std::forward<T>(x));
  21. 	}
  22.  
  23. 	template <typename T>
  24. 	void operator=(std::initializer_list<T> x) {
  25. 		_copy(x);
  26. 	}
  27. };
  28.  
  29. int main() {
  30.  
  31. 	A a;
  32. 	a={1,2,5};
  33. 	a=5.6;
  34.  
  35. 	B b;
  36. 	b={1,5,6};
  37. 	b=4.7;
  38.  
  39. }
  40.  
Success #stdin #stdout 0s 4964KB
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stdin
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Standard input is empty
stdout
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int[3]: 1 2 5
float: 5.6
int[3]: 1 5 6
+ 
float: 4.7
+
https://ideone.com/N9MCO0
language:
C++14 (clang 8.0)
created:
3 years ago
visibility:
public

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