1 // RUN: %clang_cc1 -fsyntax-only -verify %s
2 template<typename T, typename U = int> struct A; // expected-note {{template is declared here}} \
3 // expected-note{{explicitly specialized}}
4
5 template<> struct A<double, double>; // expected-note{{forward declaration}}
6
7 template<> struct A<float, float> { // expected-note{{previous definition}}
8 int x;
9 };
10
11 template<> struct A<float> { // expected-note{{previous definition}}
12 int y;
13 };
14
test_specs(A<float,float> * a1,A<float,int> * a2)15 int test_specs(A<float, float> *a1, A<float, int> *a2) {
16 return a1->x + a2->y;
17 }
18
test_incomplete_specs(A<double,double> * a1,A<double> * a2)19 int test_incomplete_specs(A<double, double> *a1,
20 A<double> *a2)
21 {
22 (void)a1->x; // expected-error{{member access into incomplete type}}
23 (void)a2->x; // expected-error{{implicit instantiation of undefined template 'A<double, int>'}}
24 }
25
26 typedef float FLOAT;
27
28 template<> struct A<float, FLOAT>;
29
30 template<> struct A<FLOAT, float> { }; // expected-error{{redefinition}}
31
32 template<> struct A<float, int> { }; // expected-error{{redefinition}}
33
34 template<typename T, typename U = int> struct X;
35
36 template <> struct X<int, int> { int foo(); }; // #1
37 template <> struct X<float> { int bar(); }; // #2
38
39 typedef int int_type;
testme(X<int_type> * x1,X<float,int> * x2)40 void testme(X<int_type> *x1, X<float, int> *x2) {
41 (void)x1->foo(); // okay: refers to #1
42 (void)x2->bar(); // okay: refers to #2
43 }
44
45 // Make sure specializations are proper classes.
46 template<>
47 struct A<char> {
48 A();
49 };
50
A()51 A<char>::A() { }
52
53 // Make sure we can see specializations defined before the primary template.
54 namespace N{
55 template<typename T> struct A0;
56 }
57
58 namespace N {
59 template<>
60 struct A0<void> {
61 typedef void* pointer;
62 };
63 }
64
65 namespace N {
66 template<typename T>
67 struct A0 {
68 void foo(A0<void>::pointer p = 0);
69 };
70 }
71
72 // Diagnose specialization errors
73 struct A<double> { }; // expected-error{{template specialization requires 'template<>'}}
74
75 template<> struct ::A<double>;
76
77 namespace N {
78 template<typename T> struct B; // expected-note 2{{explicitly specialized}}
79
80 template<> struct ::N::B<char>; // okay
81 template<> struct ::N::B<short>; // okay
82 template<> struct ::N::B<int>; // okay
83
84 int f(int);
85 }
86
87 template<> struct N::B<int> { }; // okay
88
89 template<> struct N::B<float> { }; // expected-warning{{C++11 extension}}
90
91 namespace M {
92 template<> struct ::N::B<short> { }; // expected-error{{class template specialization of 'B' not in a namespace enclosing 'N'}}
93
94 template<> struct ::A<long double>; // expected-error{{must occur at global scope}}
95 }
96
97 template<> struct N::B<char> {
testfN::B98 int testf(int x) { return f(x); }
99 };
100
101 // PR5264
102 template <typename T> class Foo;
103 Foo<int>* v;
F()104 Foo<int>& F() { return *v; }
105 template <typename T> class Foo {};
106 Foo<int> x;
107
108
109 // Template template parameters
110 template<template<class T> class Wibble>
111 class Wibble<int> { }; // expected-error{{cannot specialize a template template parameter}}
112
113 namespace rdar9676205 {
114 template<typename T>
115 struct X {
116 template<typename U>
117 struct X<U*> { // expected-error{{explicit specialization of 'X' in class scope}}
118 };
119 };
120
121 }
122
123 namespace PR18009 {
124 template <typename T> struct A {
125 template <int N, int M> struct S;
126 template <int N> struct S<N, sizeof(T)> {};
127 };
128 A<int>::S<8, sizeof(int)> a; // ok
129
130 template <typename T> struct B {
131 template <int N, int M> struct S; // expected-note {{declared here}}
132 template <int N> struct S<N, sizeof(T) +
133 N // expected-error {{non-type template argument depends on a template parameter of the partial specialization}}
134 > {};
135 };
136 B<int>::S<8, sizeof(int) + 8> s; // expected-error {{undefined}}
137
138 template<int A> struct outer {
139 template<int B, int C> struct inner {};
140 template<int C> struct inner<A * 2, C> {};
141 };
142 }
143
144 namespace PR16519 {
145 template<typename T, T...N> struct integer_sequence { typedef T value_type; }; // expected-warning {{extension}}
146
147 template<typename T> struct __make_integer_sequence;
148 template<typename T, T N> using make_integer_sequence = typename __make_integer_sequence<T>::template make<N, N % 2>::type; // expected-warning {{extension}}
149
150 template<typename T, typename T::value_type ...Extra> struct __make_integer_sequence_impl; // expected-warning {{extension}}
151 template<typename T, T ...N, T ...Extra> struct __make_integer_sequence_impl<integer_sequence<T, N...>, Extra...> { // expected-warning 2{{extension}}
152 typedef integer_sequence<T, N..., sizeof...(N) + N..., Extra...> type;
153 };
154
155 template<typename T> struct __make_integer_sequence {
156 template<T N, T Parity, typename = void> struct make;
157 template<typename Dummy> struct make<0, 0, Dummy> { typedef integer_sequence<T> type; };
158 template<typename Dummy> struct make<1, 1, Dummy> { typedef integer_sequence<T, 0> type; };
159 template<T N, typename Dummy> struct make<N, 0, Dummy> : __make_integer_sequence_impl<make_integer_sequence<T, N/2> > {};
160 template<T N, typename Dummy> struct make<N, 1, Dummy> : __make_integer_sequence_impl<make_integer_sequence<T, N/2>, N - 1> {};
161 };
162
163 using X = make_integer_sequence<int, 5>; // expected-warning {{extension}}
164 using X = integer_sequence<int, 0, 1, 2, 3, 4>; // expected-warning {{extension}}
165 }
166
167 namespace DefaultArgVsPartialSpec {
168 // Check that the diagnostic points at the partial specialization, not just at
169 // the default argument.
170 template<typename T, int N =
171 sizeof(T) // expected-note {{template parameter is used in default argument declared here}}
172 > struct X {};
173 template<typename T> struct X<T> {}; // expected-error {{non-type template argument depends on a template parameter of the partial specialization}}
174
175 template<typename T,
176 T N = 0 // expected-note {{template parameter is declared here}}
177 > struct S;
178 template<typename T> struct S<T> {}; // expected-error {{non-type template argument specializes a template parameter with dependent type 'T'}}
179 }
180