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  1. #include <iostream>
  2.  
  3.  
  4.     template<class T>
  5.     struct generic_property {
  6.       virtual T getValue() const = 0;
  7.       virtual void setValue(T const&) = 0;
  8.     protected:
  9.       virtual ~generic_property() {}
  10.     };
  11.     template<class D, class T, void(D::*set)(T const&), T(D::*get)() const>
  12.     struct property:generic_property<T> {
  13.     	T getValue() const final {
  14.     		return (self->*get)();
  15.     	}
  16.     	void setValue(T const& t) final {
  17.     		(self->*set)(t);
  18.     	}
  19.     	property( D* s ):self(s) {}
  20.  
  21. 	// cannot usually safely copy/move/trivial:    	
  22.     	property() = delete;
  23.     	property( property const& ) = delete;
  24.     	property& operator=( property const& ) = delete;
  25.     private:
  26. 	    D* self = 0;
  27.     };
  28.  
  29.     struct Bob {
  30.     	void setFoo( int const& i ) { std::cout << i << " set\n"; }
  31.     	int getFoo() const { std::cout << 42 << " get\n"; return 42; }
  32.     	property<Bob, int, &Bob::setFoo, &Bob::getFoo> foo;
  33.  
  34.     	Bob():foo(this) {}
  35.     };
  36.  
  37. int main() {
  38. 	Bob bob;
  39. 	std::cout << bob.foo.getValue() << "\n";
  40. 	bob.foo.setValue(3);
  41. 	generic_property<int>& foo = bob.foo;
  42. 	foo.setValue(4);
  43. }
Success #stdin #stdout 0s 4508KB
comments (?)
stdin
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Standard input is empty
stdout
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42 get
42
3 set
4 set
https://ideone.com/TYMFZt
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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