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  1. #ifndef _popcorn_property_hpp_
  2. #define _popcorn_property_hpp_
  3.  
  4. namespace popcorn
  5. {
  6.     enum property_flag
  7.     {
  8.         read  = 1 << 0,
  9.         write = 1 << 1,
  10.         readwrite = read | write,
  11.     };
  12.  
  13.     template<typename T, int flags = 0>
  14.         struct property;
  15.  
  16.     template<typename T>
  17.         struct property<T, 0>
  18.         {  protected: T value; };
  19.  
  20.     template<typename T>
  21.         struct property<T, read> : protected virtual property<T, 0>
  22.         {
  23.             operator T&()             { return this->value; }
  24.             operator const T&() const { return this->value; }
  25.         };
  26.  
  27.     template<typename T>
  28.         struct property<T, write> : protected virtual property<T, 0>
  29.         {
  30.             property<T, write>& operator=(T val)     { this->value = val; return *this; }
  31.         };
  32.  
  33.     template<typename T>
  34.         struct property<T, readwrite> : property<T, read>, property<T, write>
  35.         {
  36.             property<T, readwrite>& operator=(T val) { this->value = val; return *this; }
  37.         };
  38. }
  39.  
  40. #endif
  41.  
  42. int main()
  43. {
  44.     using namespace popcorn;
  45.     property<int, read> read_only;
  46.     property<int, write> write_only;
  47.     property<int, read | write> read_write;
  48.     property<int> no_access;
  49.  
  50.     static_cast<int>(read_only);
  51.     write_only = 42;
  52.     static_cast<int>(read_write);
  53.     read_write = 42;
  54. }
  55.  
Success #stdin #stdout 0.01s 2720KB
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stdout 
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https://ideone.com/XZrh9
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
secret

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