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  1. #include <queue>
  2. #include <utility>
  3.  
  4. template <typename T>
  5. class myqueue {
  6. public:
  7.     myqueue() : q() {}
  8.     virtual ~myqueue() {}
  9.  
  10.     // pushes a copy
  11.     void push(const T& item) {
  12.         q.push(item);
  13.     }
  14.     // pushes the object itself (move)
  15.     void push(T&& item) {
  16.         q.push(std::move(item));
  17.     }
  18. private:
  19.     std::queue<T> q;
  20. };
  21.  
  22. class nocopy {
  23. public:
  24.     // Default constructor
  25.     nocopy() {}
  26.  
  27.     // Move semantics
  28.     nocopy(nocopy&& other) {}
  29.     nocopy& operator=(nocopy&& rhs) {
  30.         nocopy(std::move(rhs)).swap(*this);
  31.         return *this;
  32.     }
  33.  
  34.     // Disable copy semantics
  35.     nocopy(const nocopy& other) = delete;
  36.     nocopy& operator=(const nocopy& rhs) = delete;
  37.  
  38.     void swap(const nocopy& other) {}
  39. };
  40.  
  41. int main() {
  42.     myqueue<int> q1; // compiles fine.
  43.     q1.push(1);
  44.  
  45.     std::queue<nocopy> q2; // compiles fine.
  46.     nocopy nc1;
  47.     q2.push(std::move(nc1));
  48.  
  49.     myqueue<nocopy> q3; // ERROR :(
  50.     nocopy nc2;
  51.     q3.push(std::move(nc2));
  52. }
  53.  
  54.  
  55.  
Success #stdin #stdout 0s 3028KB
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https://ideone.com/NPUkaS
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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