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  1. #include <cstdio>
  2. #include <functional>
  3. template <class T>
  4. class Property {
  5. 	T v;
  6. public:
  7. 	Property(const Property&p) {*this=static_cast<T>(p);}
  8. 	//Property() { printf("ctor %X\n", this);}
  9. 	Property(){}
  10. 	Property& operator=(const Property& src) { return*this=static_cast<T>(src); }
  11. 	Property& operator=(const T& src) {
  12. 		printf("write %X\n", this);
  13. 		v = src; 
  14. 		return *this; 
  15. 	}
  16. 	operator T() const {
  17. 		printf("Read %X\n", this);
  18. 		return v;
  19. 	}
  20. };
  21.  
  22. template <class T>
  23. class Property2 {
  24. 	typedef T(*Gfn)();
  25. 	typedef void(*Sfn)(T);
  26. 	Gfn gfn;
  27. 	Sfn sfn;
  28. public:
  29. 	Property2(const Property2&p) {*this=static_cast<T>(p);}
  30. 	//Property2() { printf("ctor %X\n", this);}
  31. 	Property2(Gfn gfn_, Sfn sfn_):gfn(gfn_), sfn(sfn_) {}
  32. 	Property2& operator=(const Property2& src) { return*this=static_cast<T>(src); }
  33. 	Property2& operator=(const T& src) {
  34. 		printf("write %X\n", this);
  35. 		sfn(src);
  36. 		return *this; 
  37. 	}
  38. 	operator T() const {
  39. 		printf("Read %X\n", this);
  40. 		return gfn();
  41. 	}
  42. };
  43.  
  44. void set(int v) {}
  45. int get() {return 9;}
  46.  
  47. Property<int> a, b;
  48. Property2<int> c(get,set), d(get,set);
  49. int main(){
  50. 	a=b=5;
  51. 	c=d=11;
  52. 	a=c=b=d=15;
  53. }
  54.  
Success #stdin #stdout 0s 2828KB
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stdin
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Standard input is empty
stdout
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write 8049890
Read 8049890
write 804988C
write 804989C
Read 804989C
write 8049894
write 804989C
Read 804989C
write 8049890
Read 8049890
write 8049894
Read 8049894
write 804988C
https://ideone.com/iUUfH
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
public

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