1// RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
2template<typename T> struct X; // expected-note {{'X' is incomplete}}
3template<int I> struct Y;
4
5X<X<int>> *x1;
6
7Y<(1 >> 2)> *y1;
8Y<1 >> 2> *y2; // FIXME: expected-error{{expected unqualified-id}}
9
10X<X<X<X<X<int>>>>> *x2;
11
12template<> struct X<int> { };
13typedef X<int> X_int;
14struct Z : X_int { };
15
16void 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
23template<typename T = void> struct X1 { };
24X1<X1<>> x1a;
25
26
27namespace ParameterPackExpansions {
28
29// A template parameter pack that [contains an unexpanded parameter pack] is a
30// pack expansion.
31
32template<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
45template<int> struct TemplateInt {};
46template<char> struct TemplateChar {};
47template<int*> struct TemplateIntPtr {};
48int x;
49
50Outer<int, char, int*>::
51Inner<12345, 'x', &x,
52      TemplateInt, TemplateChar, TemplateIntPtr,
53      int*>::
54Check check(&x);
55
56
57template<typename...Ts> struct types;
58
59enum place { _ };
60template<place...> struct places {};
61
62template<typename P1, typename P2> struct append_places;
63template<place...X1, place...X2>
64struct append_places<places<X1...>, places<X2...>> {
65  typedef places<X1...,X2...> type;
66};
67
68template<unsigned N>
69struct make_places : append_places<typename make_places<N/2>::type,
70                                   typename make_places<N-N/2>::type> {};
71template<> struct make_places<0> { typedef places<> type; };
72template<> struct make_places<1> { typedef places<_> type; };
73
74template<typename T> struct wrap {
75  template<place> struct inner { typedef T type; };
76};
77
78template<typename T> struct takedrop_impl;
79template<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
88template<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};
92template<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
97using 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)>'}}
100using 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)>'}}
101using D1 = drop<3, int, char, double, long>::type;
102using D1 = types<long>;
103
104using T2 = take<4, int, char, double, long>::type; // expected-note {{previous}}
105using T2 = types<int, char, double, long>;
106// FIXME: Desguar the types on the RHS in this diagnostic.
107// desired-error {{'types<void, void, void, void>' vs 'types<int, char, double, long>'}}
108using 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>'}}
109using D2 = drop<4, int, char, double, long>::type;
110using D2 = types<>;
111
112using T3 = take<5, int, char, double, long>::type; // expected-note {{in instantiation of}}
113using 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.
119template<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};
124template<typename T> struct vector {};
125template<typename T> struct list {};
126vector<int> vi;
127list<char> lc;
128DefArg<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.
134template<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.
138template<typename...Ts> void consume(Ts...);
139template<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};
148template<typename, int> using Int = int;
149template<typename, short> using Char = char;
150A<int, short>::B<Int, Char, -1, 'x'> b; // expected-note {{here}}
151
152}
153
154namespace 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
168namespace 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