是否存在与Python的@property修饰符相当的C++ 11？

Question

我很喜欢Python的@property修饰器;即，

class MyInteger: 
    def init(self, i): 
     self.i = i 

    # Using the @property dectorator, half looks like a member not a method 
    @property 
    def half(self): 
     return i/2.0 

在C++中是否有类似的构造可以使用？我可以谷歌它，但我不知道要搜索的术语。

Answer 1

不是说你应该，实际上，你不应该这样做。但这里有一个笑声的解决方案（它可能会改进，但嘿它只是为了好玩）：

#include <iostream> 

class MyInteger; 

class MyIntegerNoAssign { 
    public: 
     MyIntegerNoAssign() : value_(0) {} 
     MyIntegerNoAssign(int x) : value_(x) {} 

     operator int() { 
      return value_; 
     } 

    private: 
     MyIntegerNoAssign& operator=(int other) { 
      value_ = other; 
      return *this; 
     } 
     int value_; 
     friend class MyInteger; 
}; 

class MyInteger { 
    public: 
     MyInteger() : value_(0) { 
      half = 0; 
     } 
     MyInteger(int x) : value_(x) { 
      half = value_/2; 
     } 

     operator int() { 
      return value_; 
     } 

     MyInteger& operator=(int other) { 
      value_ = other; 
      half.value_ = value_/2; 
      return *this; 
     } 

     MyIntegerNoAssign half; 
    private: 
     int value_; 
}; 

int main() { 
    MyInteger x = 4; 
    std::cout << "Number is:  " << x << "\n"; 
    std::cout << "Half of it is: " << x.half << "\n"; 

    std::cout << "Changing number...\n"; 

    x = 15; 
    std::cout << "Number is:  " << x << "\n"; 
    std::cout << "Half of it is: " << x.half << "\n"; 

    // x.half = 3; Fails compilation.. 
    return 0; 
}