1 // RUN: %clang_cc1 -fsyntax-only -verify %s
2
3 // Template argument deduction with template template parameters.
4 template<typename T, template<T> class A>
5 struct X0 {
6 static const unsigned value = 0;
7 };
8
9 template<template<int> class A>
10 struct X0<int, A> {
11 static const unsigned value = 1;
12 };
13
14 template<int> struct X0i;
15 template<long> struct X0l;
16 int array_x0a[X0<long, X0l>::value == 0? 1 : -1];
17 int array_x0b[X0<int, X0i>::value == 1? 1 : -1];
18
19 template<typename T, typename U>
20 struct is_same {
21 static const bool value = false;
22 };
23
24 template<typename T>
25 struct is_same<T, T> {
26 static const bool value = true;
27 };
28
29 template<typename T> struct allocator { };
30 template<typename T, typename Alloc = allocator<T> > struct vector {};
31
32 // Fun with meta-lambdas!
33 struct _1 {};
34 struct _2 {};
35
36 // Replaces all occurrences of _1 with Arg1 and _2 with Arg2 in T.
37 template<typename T, typename Arg1, typename Arg2>
38 struct Replace {
39 typedef T type;
40 };
41
42 // Replacement of the whole type.
43 template<typename Arg1, typename Arg2>
44 struct Replace<_1, Arg1, Arg2> {
45 typedef Arg1 type;
46 };
47
48 template<typename Arg1, typename Arg2>
49 struct Replace<_2, Arg1, Arg2> {
50 typedef Arg2 type;
51 };
52
53 // Replacement through cv-qualifiers
54 template<typename T, typename Arg1, typename Arg2>
55 struct Replace<const T, Arg1, Arg2> {
56 typedef typename Replace<T, Arg1, Arg2>::type const type;
57 };
58
59 // Replacement of templates
60 template<template<typename> class TT, typename T1, typename Arg1, typename Arg2>
61 struct Replace<TT<T1>, Arg1, Arg2> {
62 typedef TT<typename Replace<T1, Arg1, Arg2>::type> type;
63 };
64
65 template<template<typename, typename> class TT, typename T1, typename T2,
66 typename Arg1, typename Arg2>
67 struct Replace<TT<T1, T2>, Arg1, Arg2> {
68 typedef TT<typename Replace<T1, Arg1, Arg2>::type,
69 typename Replace<T2, Arg1, Arg2>::type> type;
70 };
71
72 // Just for kicks...
73 template<template<typename, typename> class TT, typename T1,
74 typename Arg1, typename Arg2>
75 struct Replace<TT<T1, _2>, Arg1, Arg2> {
76 typedef TT<typename Replace<T1, Arg1, Arg2>::type, Arg2> type;
77 };
78
79 int array0[is_same<Replace<_1, int, float>::type, int>::value? 1 : -1];
80 int array1[is_same<Replace<const _1, int, float>::type, const int>::value? 1 : -1];
81 int array2[is_same<Replace<vector<_1>, int, float>::type, vector<int> >::value? 1 : -1];
82 int array3[is_same<Replace<vector<const _1>, int, float>::type, vector<const int> >::value? 1 : -1];
83 int array4[is_same<Replace<vector<int, _2>, double, float>::type, vector<int, float> >::value? 1 : -1];
84
85 // PR5911
86 template <typename T, int N> void f(const T (&a)[N]);
87 int iarr[] = { 1 };
test_PR5911()88 void test_PR5911() { f(iarr); }
89
90 // Must not examine base classes of incomplete type during template argument
91 // deduction.
92 namespace PR6257 {
93 template <typename T> struct X {
94 template <typename U> X(const X<U>& u);
95 };
96 struct A;
97 void f(A& a);
98 void f(const X<A>& a);
test(A & a)99 void test(A& a) { (void)f(a); }
100 }
101
102 // PR7463
103 namespace PR7463 {
104 const int f ();
105 template <typename T_> void g (T_&); // expected-note{{T_ = int}}
h(void)106 void h (void) { g(f()); } // expected-error{{no matching function for call}}
107 }
108
109 namespace test0 {
110 template <class T> void make(const T *(*fn)()); // expected-note {{candidate template ignored: can't deduce a type for 'T' which would make 'const T' equal 'char'}}
111 char *char_maker();
test()112 void test() {
113 make(char_maker); // expected-error {{no matching function for call to 'make'}}
114 }
115 }
116
117 namespace test1 {
118 template<typename T> void foo(const T a[3][3]);
test()119 void test() {
120 int a[3][3];
121 foo(a);
122 }
123 }
124
125 // PR7708
126 namespace test2 {
127 template<typename T> struct Const { typedef void const type; };
128
129 template<typename T> void f(T, typename Const<T>::type*);
130 template<typename T> void f(T, void const *);
131
test()132 void test() {
133 void *p = 0;
134 f(0, p);
135 }
136 }
137
138 // rdar://problem/8537391
139 namespace test3 {
140 struct Foo {
141 template <void F(char)> static inline void foo();
142 };
143
144 class Bar {
145 template<typename T> static inline void wobble(T ch);
146
147 public:
madness()148 static void madness() {
149 Foo::foo<wobble<char> >();
150 }
151 };
152 }
153
154 // Verify that we can deduce enum-typed arguments correctly.
155 namespace test14 {
156 enum E { E0, E1 };
157 template <E> struct A {};
foo(const A<e> & a)158 template <E e> void foo(const A<e> &a) {}
159
test()160 void test() {
161 A<E0> a;
162 foo(a);
163 }
164 }
165