1 | // RUN: %clang_cc1 -fsyntax-only -verify -pedantic -Wc++11-compat %s |
2 | // RUN: %clang_cc1 -fsyntax-only -verify -pedantic -Wc++11-compat -std=c++98 %s |
3 | // RUN: %clang_cc1 -fsyntax-only -verify -pedantic -std=c++11 %s |
4 | // |
5 | // Tests explicit instantiation of templates. |
6 | template<typename T, typename U = T> class X0 { }; |
7 | |
8 | namespace N { |
9 | template<typename T, typename U = T> class X1 { }; |
10 | } |
11 | |
12 | // Check the syntax of explicit instantiations. |
13 | template class X0<int, float>; |
14 | template class X0<int>; // expected-note{{previous}} |
15 | |
16 | template class N::X1<int>; |
17 | template class ::N::X1<int, float>; |
18 | |
19 | using namespace N; |
20 | |
21 | // Check for some bogus syntax that probably means that the user |
22 | // wanted to write an explicit specialization, but forgot the '<>' |
23 | // after 'template'. |
24 | template class X0<double> { }; // expected-error{{explicit specialization}} |
25 | |
26 | // Check for explicit instantiations that come after other kinds of |
27 | // instantiations or declarations. |
28 | template class X0<int, int>; // expected-error{{duplicate}} |
29 | |
30 | template<> class X0<char> { }; // expected-note{{previous}} |
31 | template class X0<char>; // expected-warning{{has no effect}} |
32 | |
33 | void foo(X0<short>) { } |
34 | template class X0<short>; |
35 | |
36 | // Check that explicit instantiations actually produce definitions. We |
37 | // determine whether this happens by placing semantic errors in the |
38 | // definition of the template we're instantiating. |
39 | template<typename T> struct X2; // expected-note{{declared here}} |
40 | |
41 | template struct X2<float>; // expected-error{{undefined template}} |
42 | |
43 | template<typename T> |
44 | struct X2 { |
45 | void f0(T*); // expected-error{{pointer to a reference}} |
46 | }; |
47 | |
48 | template struct X2<int>; // okay |
49 | template struct X2<int&>; // expected-note{{in instantiation of}} |
50 | |
51 | // Check that explicit instantiations instantiate member classes. |
52 | template<typename T> struct X3 { |
53 | struct Inner { |
54 | void f(T*); // expected-error{{pointer to a reference}} |
55 | }; |
56 | }; |
57 | |
58 | void f1(X3<int&>); // okay, Inner, not instantiated |
59 | |
60 | template struct X3<int&>; // expected-note{{instantiation}} |
61 | |
62 | template<typename T> struct X4 { |
63 | struct Inner { |
64 | struct VeryInner { |
65 | void f(T*); // expected-error 2{{pointer to a reference}} |
66 | }; |
67 | }; |
68 | }; |
69 | |
70 | void f2(X4<int&>); // okay, Inner, not instantiated |
71 | void f3(X4<int&>::Inner); // okay, Inner::VeryInner, not instantiated |
72 | |
73 | template struct X4<int&>; // expected-note{{instantiation}} |
74 | template struct X4<float&>; // expected-note{{instantiation}} |
75 | |
76 | // Check explicit instantiation of member classes |
77 | namespace N2 { |
78 | |
79 | template<typename T> |
80 | struct X5 { |
81 | struct Inner1 { |
82 | void f(T&); |
83 | }; |
84 | |
85 | struct Inner2 { // expected-note {{here}} |
86 | struct VeryInner { |
87 | void g(T*); // expected-error 2{{pointer to a reference}} |
88 | }; |
89 | }; |
90 | }; |
91 | |
92 | } |
93 | |
94 | template struct N2::X5<void>::Inner2; |
95 | |
96 | using namespace N2; |
97 | template struct X5<int&>::Inner2; // expected-note{{instantiation}} |
98 | |
99 | void f4(X5<float&>::Inner2); |
100 | template struct X5<float&>::Inner2; // expected-note{{instantiation}} |
101 | |
102 | namespace N3 { |
103 | template struct N2::X5<int>::Inner2; |
104 | #if __cplusplus <= 199711L |
105 | // expected-warning@-2 {{explicit instantiation of 'Inner2' not in a namespace enclosing 'N2'}} |
106 | #else |
107 | // expected-error@-4 {{explicit instantiation of 'Inner2' not in a namespace enclosing 'N2'}} |
108 | #endif |
109 | } |
110 | |
111 | struct X6 { |
112 | struct Inner { // expected-note{{here}} |
113 | void f(); |
114 | }; |
115 | }; |
116 | |
117 | template struct X6::Inner; // expected-error{{non-templated}} |
118 | |
119 | // PR5559 |
120 | template <typename T> |
121 | struct Foo; |
122 | |
123 | template <> |
124 | struct Foo<int> // expected-note{{header not required for explicitly-specialized}} |
125 | { |
126 | template <typename U> |
127 | struct Bar |
128 | {}; |
129 | }; |
130 | |
131 | template <> // expected-warning{{extraneous template parameter list}} |
132 | template <> |
133 | struct Foo<int>::Bar<void> |
134 | {}; |
135 | |
136 | namespace N1 { |
137 | |
138 | template<typename T> struct X7 { }; // expected-note{{here}} |
139 | |
140 | namespace Inner { |
141 | template<typename T> struct X8 { }; |
142 | } |
143 | |
144 | template struct X7<int>; |
145 | template struct Inner::X8<int>; |
146 | } |
147 | |
148 | template<typename T> struct X9 { }; // expected-note{{here}} |
149 | |
150 | template struct ::N1::Inner::X8<float>; |
151 | |
152 | namespace N2 { |
153 | using namespace N1; |
154 | |
155 | template struct X7<double>; |
156 | #if __cplusplus <= 199711L |
157 | // expected-warning@-2 {{explicit instantiation of 'N1::X7' must occur in namespace 'N1'}} |
158 | #else |
159 | // expected-error@-4 {{explicit instantiation of 'N1::X7' must occur in namespace 'N1'}} |
160 | #endif |
161 | |
162 | template struct X9<float>; |
163 | #if __cplusplus <= 199711L |
164 | // expected-warning@-2 {{explicit instantiation of 'X9' must occur at global scope}} |
165 | #else |
166 | // expected-error@-4 {{explicit instantiation of 'X9' must occur at global scope}} |
167 | #endif |
168 | } |
169 | |