Douglas Gregor | a58861f | 2009-05-13 20:28:22 +0000 | [diff] [blame] | 1 | // RUN: clang-cc -fsyntax-only -pedantic -verify %s |
Douglas Gregor | 4d9a16f | 2009-05-12 23:25:50 +0000 | [diff] [blame] | 2 | // |
| 3 | // Tests explicit instantiation of templates. |
| 4 | template<typename T, typename U = T> class X0 { }; |
| 5 | |
| 6 | namespace N { |
| 7 | template<typename T, typename U = T> class X1 { }; |
| 8 | } |
| 9 | |
Douglas Gregor | 93dfdb1 | 2009-05-13 00:25:59 +0000 | [diff] [blame] | 10 | // Check the syntax of explicit instantiations. |
Douglas Gregor | 4d9a16f | 2009-05-12 23:25:50 +0000 | [diff] [blame] | 11 | template class X0<int, float>; |
Douglas Gregor | 93dfdb1 | 2009-05-13 00:25:59 +0000 | [diff] [blame] | 12 | template class X0<int>; // expected-note{{previous}} |
Douglas Gregor | 4d9a16f | 2009-05-12 23:25:50 +0000 | [diff] [blame] | 13 | |
| 14 | template class N::X1<int>; |
| 15 | template class ::N::X1<int, float>; |
| 16 | |
| 17 | using namespace N; |
| 18 | template class X1<float>; |
| 19 | |
Douglas Gregor | 93dfdb1 | 2009-05-13 00:25:59 +0000 | [diff] [blame] | 20 | // Check for some bogus syntax that probably means that the user |
| 21 | // wanted to write an explicit specialization, but forgot the '<>' |
| 22 | // after 'template'. |
Douglas Gregor | 4d9a16f | 2009-05-12 23:25:50 +0000 | [diff] [blame] | 23 | template class X0<double> { }; // expected-error{{explicit specialization}} |
Douglas Gregor | 93dfdb1 | 2009-05-13 00:25:59 +0000 | [diff] [blame] | 24 | |
| 25 | // Check for explicit instantiations that come after other kinds of |
| 26 | // instantiations or declarations. |
Douglas Gregor | ff66803 | 2009-05-13 18:28:20 +0000 | [diff] [blame] | 27 | template class X0<int, int>; // expected-error{{duplicate}} |
Douglas Gregor | 93dfdb1 | 2009-05-13 00:25:59 +0000 | [diff] [blame] | 28 | |
| 29 | template<> class X0<char> { }; // expected-note{{previous}} |
Douglas Gregor | ff66803 | 2009-05-13 18:28:20 +0000 | [diff] [blame] | 30 | template class X0<char>; // expected-warning{{ignored}} |
Douglas Gregor | 93dfdb1 | 2009-05-13 00:25:59 +0000 | [diff] [blame] | 31 | |
Douglas Gregor | ff66803 | 2009-05-13 18:28:20 +0000 | [diff] [blame] | 32 | void foo(X0<short>) { } |
| 33 | template class X0<short>; |
Douglas Gregor | 93dfdb1 | 2009-05-13 00:25:59 +0000 | [diff] [blame] | 34 | |
| 35 | // Check that explicit instantiations actually produce definitions. We |
| 36 | // determine whether this happens by placing semantic errors in the |
| 37 | // definition of the template we're instantiating. |
| 38 | template<typename T> struct X2; // expected-note{{declared here}} |
| 39 | |
| 40 | template struct X2<float>; // expected-error{{undefined template}} |
| 41 | |
| 42 | template<typename T> |
| 43 | struct X2 { |
| 44 | void f0(T*); // expected-error{{pointer to a reference}} |
| 45 | }; |
| 46 | |
| 47 | template struct X2<int>; // okay |
| 48 | template struct X2<int&>; // expected-note{{in instantiation of}} |
Douglas Gregor | a58861f | 2009-05-13 20:28:22 +0000 | [diff] [blame] | 49 | |
| 50 | // Check that explicit instantiations instantiate member classes. |
| 51 | template<typename T> struct X3 { |
Douglas Gregor | f3e7ce4 | 2009-05-18 17:01:57 +0000 | [diff] [blame] | 52 | struct Inner { |
Douglas Gregor | a58861f | 2009-05-13 20:28:22 +0000 | [diff] [blame] | 53 | void f(T*); // expected-error{{pointer to a reference}} |
| 54 | }; |
| 55 | }; |
| 56 | |
| 57 | void f1(X3<int&>); // okay, Inner, not instantiated |
| 58 | |
| 59 | template struct X3<int&>; // expected-note{{instantiation}} |
| 60 | |
| 61 | template<typename T> struct X4 { |
Douglas Gregor | f3e7ce4 | 2009-05-18 17:01:57 +0000 | [diff] [blame] | 62 | struct Inner { |
| 63 | struct VeryInner { |
Douglas Gregor | a58861f | 2009-05-13 20:28:22 +0000 | [diff] [blame] | 64 | void f(T*); // expected-error 2{{pointer to a reference}} |
| 65 | }; |
| 66 | }; |
| 67 | }; |
| 68 | |
| 69 | void f2(X4<int&>); // okay, Inner, not instantiated |
| 70 | void f3(X4<int&>::Inner); // okay, Inner::VeryInner, not instantiated |
| 71 | |
| 72 | template struct X4<int&>; // expected-note{{instantiation}} |
| 73 | template struct X4<float&>; // expected-note{{instantiation}} |
Douglas Gregor | 3f5b61c | 2009-05-14 00:28:11 +0000 | [diff] [blame] | 74 | |
| 75 | // Check explicit instantiation of member classes |
| 76 | namespace N2 { |
| 77 | |
| 78 | template<typename T> |
| 79 | struct X5 { |
| 80 | struct Inner1 { |
| 81 | void f(T&); |
| 82 | }; |
| 83 | |
| 84 | struct Inner2 { |
Douglas Gregor | f3e7ce4 | 2009-05-18 17:01:57 +0000 | [diff] [blame] | 85 | struct VeryInner { |
Douglas Gregor | 3f5b61c | 2009-05-14 00:28:11 +0000 | [diff] [blame] | 86 | void g(T*); // expected-error 2{{pointer to a reference}} |
| 87 | }; |
| 88 | }; |
| 89 | }; |
| 90 | |
| 91 | } |
| 92 | |
| 93 | template struct N2::X5<void>::Inner2; |
| 94 | |
| 95 | using namespace N2; |
| 96 | template struct X5<int&>::Inner2; // expected-note{{instantiation}} |
| 97 | |
| 98 | void f4(X5<float&>::Inner2); |
| 99 | template struct X5<float&>::Inner2; // expected-note{{instantiation}} |
| 100 | |
| 101 | namespace N3 { |
| 102 | template struct N2::X5<int>::Inner2; |
| 103 | } |
| 104 | |
| 105 | struct X6 { |
| 106 | struct Inner { // expected-note{{here}} |
| 107 | void f(); |
| 108 | }; |
| 109 | }; |
| 110 | |
| 111 | template struct X6::Inner; // expected-error{{non-templated}} |