1 | // RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s |
2 | template<typename T> struct X; // expected-note {{'X' is incomplete}} |
3 | template<int I> struct Y; |
4 | |
5 | X<X<int>> *x1; |
6 | |
7 | Y<(1 >> 2)> *y1; |
8 | Y<1 >> 2> *y2; // FIXME: expected-error{{expected unqualified-id}} |
9 | |
10 | X<X<X<X<X<int>>>>> *x2; |
11 | |
12 | template<> struct X<int> { }; |
13 | typedef X<int> X_int; |
14 | struct Z : X_int { }; |
15 | |
16 | void f(const X<int> x) { |
17 | (void)reinterpret_cast<X<int>>(x); // expected-error{{reinterpret_cast from}} |
18 | (void)reinterpret_cast<X<X<X<int>>>>(x); // expected-error{{reinterpret_cast from}} |
19 | |
20 | X<X<int>> *x1; |
21 | } |
22 | |
23 | template<typename T = void> struct X1 { }; |
24 | X1<X1<>> x1a; |
25 | |
26 | |
27 | namespace ParameterPackExpansions { |
28 | |
29 | // A template parameter pack that [contains an unexpanded parameter pack] is a |
30 | // pack expansion. |
31 | |
32 | template<typename...Ts> struct Outer { |
33 | // From [temp.variadic]p4: |
34 | // In a template parameter pack that is a pack expansion, the pattern is |
35 | // [...the template-parameter...] without the ellipsis. |
36 | // Therefore the resulting sequence of parameters is not a parameter pack, |
37 | // so is not required to be the last template parameter. |
38 | template<Ts ...As, template<Ts> class ...Bs, typename ...Cs> struct Inner { |
39 | struct Check : Bs<As>... { |
40 | Check(Cs...); |
41 | }; |
42 | }; |
43 | }; |
44 | |
45 | template<int> struct TemplateInt {}; |
46 | template<char> struct TemplateChar {}; |
47 | template<int*> struct TemplateIntPtr {}; |
48 | int x; |
49 | |
50 | Outer<int, char, int*>:: |
51 | Inner<12345, 'x', &x, |
52 | TemplateInt, TemplateChar, TemplateIntPtr, |
53 | int*>:: |
54 | Check check(&x); |
55 | |
56 | |
57 | template<typename...Ts> struct types; |
58 | |
59 | enum place { _ }; |
60 | template<place...> struct places {}; |
61 | |
62 | template<typename P1, typename P2> struct append_places; |
63 | template<place...X1, place...X2> |
64 | struct append_places<places<X1...>, places<X2...>> { |
65 | typedef places<X1...,X2...> type; |
66 | }; |
67 | |
68 | template<unsigned N> |
69 | struct make_places : append_places<typename make_places<N/2>::type, |
70 | typename make_places<N-N/2>::type> {}; |
71 | template<> struct make_places<0> { typedef places<> type; }; |
72 | template<> struct make_places<1> { typedef places<_> type; }; |
73 | |
74 | template<typename T> struct wrap { |
75 | template<place> struct inner { typedef T type; }; |
76 | }; |
77 | |
78 | template<typename T> struct takedrop_impl; |
79 | template<place...X> struct takedrop_impl<places<X...>> { |
80 | template<template<decltype(X)> class ...Take, |
81 | template<place > class ...Drop> |
82 | struct inner { // expected-note 2{{declared}} |
83 | typedef types<typename Take<_>::type...> take; |
84 | typedef types<typename Drop<_>::type...> drop; |
85 | }; |
86 | }; |
87 | |
88 | template<unsigned N, typename...Ts> struct take { |
89 | using type = typename takedrop_impl<typename make_places<N>::type>:: |
90 | template inner<wrap<Ts>::template inner...>::take; // expected-error {{too few template arguments}} |
91 | }; |
92 | template<unsigned N, typename...Ts> struct drop { |
93 | using type = typename takedrop_impl<typename make_places<N>::type>:: |
94 | template inner<wrap<Ts>::template inner...>::drop; // expected-error {{too few template arguments}} |
95 | }; |
96 | |
97 | using T1 = take<3, int, char, double, long>::type; // expected-note {{previous}} |
98 | // FIXME: Desguar the types on the RHS in this diagnostic. |
99 | // desired-error {{'types<void, void, void, void>' vs 'types<int, char, double, (no argument)>'}} |
100 | using T1 = types<void, void, void, void>; // expected-error {{'types<void, void, void, void>' vs 'types<typename inner<_>::type, typename inner<_>::type, typename inner<_>::type, (no argument)>'}} |
101 | using D1 = drop<3, int, char, double, long>::type; |
102 | using D1 = types<long>; |
103 | |
104 | using T2 = take<4, int, char, double, long>::type; // expected-note {{previous}} |
105 | // FIXME: Desguar the types on the RHS in this diagnostic. |
106 | // desired-error {{'types<void, void, void, void>' vs 'types<int, char, double, long>'}} |
107 | using T2 = types<void, void, void, void>; // expected-error {{'types<void, void, void, void>' vs 'types<typename inner<_>::type, typename inner<_>::type, typename inner<_>::type, typename inner<_>::type>'}} |
108 | using T2 = types<int, char, double, long>; |
109 | using D2 = drop<4, int, char, double, long>::type; |
110 | using D2 = types<>; |
111 | |
112 | using T3 = take<5, int, char, double, long>::type; // expected-note {{in instantiation of}} |
113 | using D3 = drop<5, int, char, double, long>::type; // expected-note {{in instantiation of}} |
114 | |
115 | |
116 | // FIXME: We should accept this code. A parameter pack within a default argument |
117 | // in a template template parameter pack is expanded, because the pack is |
118 | // implicitly a pack expansion. |
119 | template<typename ...Default> struct DefArg { |
120 | template<template<typename T = Default> class ...Classes> struct Inner { // expected-error {{default argument contains unexpanded parameter pack}} expected-note {{here}} |
121 | Inner(Classes<>...); // expected-error {{too few}} |
122 | }; |
123 | }; |
124 | template<typename T> struct vector {}; |
125 | template<typename T> struct list {}; |
126 | vector<int> vi; |
127 | list<char> lc; |
128 | DefArg<int, char>::Inner<vector, list> defarg(vi, lc); |
129 | |
130 | |
131 | // FIXME: |
132 | // A template parameter pack that is a pack expansion shall not expand a |
133 | // parameter pack declared in the same template-parameter-list. |
134 | template<typename...Ts, Ts...Vs> void error(); // desired-error |
135 | |
136 | // This case should not produce an error, because in A's instantiation, Cs is |
137 | // not a parameter pack. |
138 | template<typename...Ts> void consume(Ts...); |
139 | template<typename...Ts> struct A { |
140 | template<template<typename, Ts = 0> class ...Cs, Cs<Ts> ...Vs> struct B { // ok |
141 | B() { |
142 | consume([]{ |
143 | int arr[Vs]; // expected-error {{negative size}} |
144 | }...); |
145 | } |
146 | }; |
147 | }; |
148 | template<typename, int> using Int = int; |
149 | template<typename, short> using Char = char; |
150 | A<int, short>::B<Int, Char, -1, 'x'> b; // expected-note {{here}} |
151 | |
152 | } |
153 | |
154 | namespace PR9023 { |
155 | template<typename ...T> struct A { |
156 | template<template<T> class ...> struct B { |
157 | }; |
158 | }; |
159 | |
160 | template<int> struct C { }; |
161 | template<long> struct D { }; |
162 | |
163 | int main() { |
164 | A<int, long>::B<C, D> e; |
165 | } |
166 | } |
167 | |
168 | namespace std_examples { |
169 | template <class... Types> class Tuple; |
170 | template <class T, int... Dims> struct multi_array; |
171 | template <class... T> struct value_holder { |
172 | template<T... Values> struct apply { }; |
173 | }; |
174 | template <class... T, T... Values> struct static_array; // expected-error {{must be the last}} |
175 | |
176 | int n; |
177 | value_holder<int, char, int*>::apply<12345, 'x', &n> test; |
178 | } |
179 | |