1// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
2
3template<typename T>
4class unique_ptr {
5  T *ptr;
6
7  unique_ptr(const unique_ptr&) = delete; // expected-note 3{{'unique_ptr' has been explicitly marked deleted here}}
8  unique_ptr &operator=(const unique_ptr&) = delete; // expected-note{{candidate function has been explicitly deleted}}
9public:
10  unique_ptr() : ptr(0) { }
11  unique_ptr(unique_ptr &&other) : ptr(other.ptr) { other.ptr = 0; }
12  explicit unique_ptr(T *ptr) : ptr(ptr) { }
13
14  ~unique_ptr() { delete ptr; }
15
16  unique_ptr &operator=(unique_ptr &&other) { // expected-note{{candidate function not viable: no known conversion from 'unique_ptr<int>' to 'unique_ptr<int> &&' for 1st argument}}
17    if (this == &other)
18      return *this;
19
20    delete ptr;
21    ptr = other.ptr;
22    other.ptr = 0;
23    return *this;
24  }
25};
26
27template<typename T>
28struct remove_reference {
29  typedef T type;
30};
31
32template<typename T>
33struct remove_reference<T&> {
34  typedef T type;
35};
36
37template<typename T>
38struct remove_reference<T&&> {
39  typedef T type;
40};
41
42
43template <class T> typename remove_reference<T>::type&& move(T&& t) {
44  return static_cast<typename remove_reference<T>::type&&>(t);
45}
46
47template <class T> T&& forward(typename remove_reference<T>::type& t) {
48  return static_cast<T&&>(t);
49}
50
51template <class T> T&& forward(typename remove_reference<T>::type&& t) {
52  return static_cast<T&&>(t);
53}
54
55template<typename T, typename ...Args>
56unique_ptr<T> make_unique_ptr(Args &&...args) {
57  return unique_ptr<T>(new T(forward<Args>(args)...));
58}
59
60template<typename T> void accept_unique_ptr(unique_ptr<T>); // expected-note{{passing argument to parameter here}}
61
62unique_ptr<int> test_unique_ptr() {
63  // Simple construction
64  unique_ptr<int> p;
65  unique_ptr<int> p1(new int);
66
67  // Move construction
68  unique_ptr<int> p2(make_unique_ptr<int>(17));
69  unique_ptr<int> p3 = make_unique_ptr<int>(17);
70
71  // Copy construction (failures)
72  unique_ptr<int> p4(p); // expected-error{{call to deleted constructor of 'unique_ptr<int>'}}
73  unique_ptr<int> p5 = p; // expected-error{{call to deleted constructor of 'unique_ptr<int>'}}
74
75  // Move assignment
76  p2 = move(p);
77  p2 = make_unique_ptr<int>(0);
78
79  // Copy assignment (failures);
80  p2 = p3; // expected-error{{overload resolution selected deleted operator '='}}
81
82  // Implicit copies
83  accept_unique_ptr(make_unique_ptr<double>(0.0));
84  accept_unique_ptr(move(p2));
85
86  // Implicit copies (failures);
87  accept_unique_ptr(p); // expected-error{{call to deleted constructor of 'unique_ptr<int>'}}
88
89  return p;
90}
91
92namespace perfect_forwarding {
93  struct A { };
94
95  struct F0 {
96    void operator()(A&, const A&, A&&, const A&&, A&&, const A&&); // expected-note{{candidate function not viable: 5th argument ('const perfect_forwarding::A') would lose const qualifier}}
97  };
98
99  template<typename F, typename ...Args>
100  void forward(F f, Args &&...args) {
101    f(static_cast<Args&&>(args)...); // expected-error{{no matching function for call to object of type 'perfect_forwarding::F0'}}
102  }
103
104  template<typename T> T get();
105
106  void test_forward() {
107    forward(F0(), get<A&>(), get<A const&>(), get<A>(), get<const A>(),
108            get<A&&>(), get<const A&&>());
109    forward(F0(), get<A&>(), get<A const&>(), get<A>(), get<const A>(), // expected-note{{in instantiation of function template specialization 'perfect_forwarding::forward<perfect_forwarding::F0, perfect_forwarding::A &, const perfect_forwarding::A &, perfect_forwarding::A, const perfect_forwarding::A, const perfect_forwarding::A, const perfect_forwarding::A>' requested here}}
110            get<const A&&>(), get<const A&&>());
111  }
112};
113