p3.cpp revision 053105d58552c600a2e56473592212a9bddafcd4 
1// RUN: %clang_cc1 -fsyntax-only -verify %s
2
3template<typename T> struct A { };
4
5// Top-level cv-qualifiers of P's type are ignored for type deduction.
6template<typename T> A<T> f0(const T);
7
8void test_f0(int i, const int ci) {
9  A<int> a0 = f0(i);
10  A<int> a1 = f0(ci);
11}
12
13// If P is a reference type, the type referred to by P is used for type
14// deduction.
15template<typename T> A<T> f1(T&);
16
17void test_f1(int i, const int ci, volatile int vi) {
18  A<int> a0 = f1(i);
19  A<const int> a1 = f1(ci);
20  A<volatile int> a2 = f1(vi);
21}
22
23template<typename T, unsigned N> struct B { };
24template<typename T, unsigned N> B<T, N> g0(T (&array)[N]);
25template<typename T, unsigned N> B<T, N> g0b(const T (&array)[N]);
26
27void test_g0() {
28  int array0[5];
29  B<int, 5> b0 = g0(array0);
30  const int array1[] = { 1, 2, 3};
31  B<const int, 3> b1 = g0(array1);
32  B<int, 3> b2 = g0b(array1);
33}
34
35template<typename T> B<T, 0> g1(const A<T>&);
36
37void test_g1(A<float> af) {
38  B<float, 0> b0 = g1(af);
39  B<int, 0> b1 = g1(A<int>());
40}
41
42//   - If the original P is a reference type, the deduced A (i.e., the type
43//     referred to by the reference) can be more cv-qualified than the
44//     transformed A.
45template<typename T> A<T> f2(const T&);
46
47void test_f2(int i, const int ci, volatile int vi) {
48  A<int> a0 = f2(i);
49  A<int> a1 = f2(ci);
50  A<volatile int> a2 = f2(vi);
51}
52
53// PR5913
54template <typename T, int N>
55void Foo(const T (&a)[N]) {
56  T x;
57  x = 0;
58}
59
60const int a[1] = { 0 };
61
62void Test() {
63  Foo(a);
64}
65
66//   - The transformed A can be another pointer or pointer to member type that
67//     can be converted to the deduced A via a qualification conversion (4.4).
68template<typename T> A<T> f3(T * * const * const);
69
70void test_f3(int ***ip, volatile int ***vip) {
71  A<int> a0 = f3(ip);
72  A<volatile int> a1 = f3(vip);
73}
74
75//   - If P is a class, and P has the form template-id, then A can be a
76//     derived class of the deduced A. Likewise, if P is a pointer to a class
77//     of the form template-id, A can be a pointer to a derived class pointed
78//     to by the deduced A.
79template<typename T, int I> struct C { };
80
81struct D : public C<int, 1> { };
82struct E : public D { };
83struct F : A<float> { };
84struct G : A<float>, C<int, 1> { };
85
86template<typename T, int I>
87  C<T, I> *f4a(const C<T, I>&);
88template<typename T, int I>
89  C<T, I> *f4b(C<T, I>);
90template<typename T, int I>
91  C<T, I> *f4c(C<T, I>*);
92int *f4c(...);
93
94void test_f4(D d, E e, F f, G g) {
95  C<int, 1> *ci1a = f4a(d);
96  C<int, 1> *ci2a = f4a(e);
97  C<int, 1> *ci1b = f4b(d);
98  C<int, 1> *ci2b = f4b(e);
99  C<int, 1> *ci1c = f4c(&d);
100  C<int, 1> *ci2c = f4c(&e);
101  C<int, 1> *ci3c = f4c(&g);
102  int       *ip1 = f4c(&f);
103}
104
105// PR8462
106namespace N {
107  struct T0;
108  struct T1;
109
110  template<typename X, typename Y> struct B {};
111
112  struct J : B<T0,T0> {};
113  struct K : B<T1,T1> {};
114
115  struct D : J, K {};
116
117  template<typename X, typename Y> void F(B<Y,X>);
118
119  void test()
120  {
121    D d;
122    N::F<T0>(d); // Fails
123    N::F<T1>(d); // OK
124  }
125}
126