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  1. #include <iostream>
  2. #include <string>
  3.  
  4. template <typename T, typename V>
  5. class Property
  6. {
  7. public:
  8.   typedef V (T::*getter_type)() const;
  9.   typedef void (T::*setter_type)(const V &value);
  10.   Property(T *self, getter_type getter, setter_type setter) : self_(self), getter_(getter), setter_(setter) {}
  11.   V get() const { return (self_->*getter_)(); }
  12.   Property &set(const V &v) { (self_->*setter_)(v); return *this; }
  13.   operator V() const { return get(); }
  14.   Property &operator=(const V &v) { return set(v); }
  15.   Property &operator+=(const V &v) { return set(get() += v); }
  16.   V *operator ->() const { return &get(); }
  17. private:
  18.   T *self_;
  19.   getter_type getter_;
  20.   setter_type setter_;
  21. };
  22.  
  23. class Hoge
  24. {
  25. public:
  26.   Hoge() : str(this, &Hoge::get_str, &Hoge::set_str), str_("Hello") {}
  27.   Property<Hoge, std::string> str;
  28.   std::string get_str() const { return str_; }
  29.   void set_str(const std::string &s) { str_ = s; }
  30. private:
  31.   std::string str_;
  32. };
  33.  
  34. int main()
  35. {
  36.   Hoge hoge;
  37.   hoge.str += ", World!";
  38.   std::cout << hoge.str->c_str() << std::endl;
  39.   return 0;
  40. }
  41.  
stdin
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Standard input is empty
compilation info 
prog.cpp: In member function ‘V* Property<T, V>::operator->() const [with T = Hoge, V = std::basic_string<char, std::char_traits<char>, std::allocator<char> >]’:
prog.cpp:38:   instantiated from here
prog.cpp:16: warning: taking address of temporary
stdout
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Hello, World!
https://ideone.com/4vi4m
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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