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  1. #include <vector>
  2. #include <utility>
  3.  
  4. template <typename T>
  5. class r_value_ref
  6. {
  7. public:
  8.     explicit r_value_ref(const T& t) : t(t) {}
  9.  
  10.     T& get() const
  11.     {
  12.         return const_cast<T&>(t);
  13.     }
  14.  
  15.     operator T&() const
  16.     {
  17.         return const_cast<T&>(t);
  18.     }
  19.  
  20. private:    
  21.     const T& t;
  22. };
  23.  
  24. template <typename T>
  25. r_value_ref<T> my_move(const T& t)
  26. {
  27.     return r_value_ref<T>(t);
  28. }
  29.  
  30. class Foo
  31. {
  32. public:
  33.     Foo(r_value_ref<std::vector<int> > vec)
  34.     {
  35.         m_vec.swap(vec); // no .get() required !
  36.         // or std::swap(vec.get(), m_vec);
  37.     }
  38.  
  39. private:
  40.     std::vector<int> m_vec;
  41. };
  42.  
  43. int main()
  44. {
  45.     Foo foo_from_r_value(my_move(std::vector<int>(100, 1337)));
  46.  
  47.     std::vector<int> v2(100, 1337);
  48.     Foo foo_from_l_value(my_move(v2));
  49. }
  50.  
Success #stdin #stdout 0s 3468KB
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https://ideone.com/uC2wCK
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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