1 // RUN: %clang_cc1 -std=c++11 -verify %s
2
3 template<typename ...T> struct X {};
4
5 template<typename T, typename U> struct P {};
6
7 namespace Nested {
8 template<typename ...T> int f1(X<T, T...>... a); // expected-note +{{packs of different lengths for parameter 'T'}}
9 template<typename ...T> int f2(P<X<T...>, T> ...a); // expected-note +{{packs of different lengths for parameter 'T'}}
10
11 int a1 = f1(X<int, int, double>(), X<double, int, double>());
12 int a2 = f1(X<int, int>());
13 int a3 = f1(X<int>(), X<double>()); // expected-error {{no matching}}
14 int a4 = f1(X<int, int>(), X<int>()); // expected-error {{no matching}}
15 int a5 = f1(X<int>(), X<int, int>()); // expected-error {{no matching}}
16 int a6 = f1(X<int, int, int>(), X<int, int, int>(), X<int, int, int, int>()); // expected-error {{no matching}}
17
18 int b1 = f2(P<X<int, double>, int>(), P<X<int, double>, double>());
19 int b2 = f2(P<X<int, double>, int>(), P<X<int, double>, double>(), P<X<int, double>, char>()); // expected-error {{no matching}}
20 }
21
22 namespace PR14841 {
23 template<typename T, typename U> struct A {};
24 template<typename ...Ts> void f(A<Ts...>); // expected-note {{substitution failure [with Ts = <char, short, int>]: too many template arg}}
25
g(A<char,short> a)26 void g(A<char, short> a) {
27 f(a);
28 f<char>(a);
29 f<char, short>(a);
30 f<char, short, int>(a); // expected-error {{no matching function}}
31 }
32 }
33
34 namespace RetainExprPacks {
35 int f(int a, int b, int c);
36 template<typename ...Ts> struct X {};
37 template<typename ...Ts> int g(X<Ts...>, decltype(f(Ts()...)));
38 int n = g<int, int>(X<int, int, int>(), 0);
39 }
40
41 namespace PR14615 {
42 namespace comment0 {
43 template <class A, class...> struct X {};
44 template <class... B> struct X<int, B...> {
45 typedef int type;
46 struct valid {};
47 };
48 template <typename A, typename... B, typename T = X<A, B...>,
49 typename = typename T::valid>
50 typename T::type check(int);
51 int i = check<int, char>(1);
52 }
53
54 namespace comment2 {
55 template <class...> struct X;
56 template <typename... B, typename X<B...>::type I = 0>
57 char check(B...); // expected-note {{undefined template 'PR14615::comment2::X<char, int>'}}
f()58 void f() { check<char>(1, 2); } // expected-error {{no matching function}}
59 }
60
61 namespace comment3 {
62 template <class...> struct X;
63 template <typename... B, typename X<B...>::type I = (typename X<B...>::type)0>
64 char check(B...); // expected-note {{undefined template 'PR14615::comment3::X<char, int>'}}
f()65 void f() { check<char>(1, 2); } // expected-error {{no matching function}}
66 }
67 }
68
69 namespace fully_expanded_packs {
70 template<typename ...T> struct A {
ffully_expanded_packs::A71 template<T ...X> static constexpr int f() {
72 // expected-note@-1 1+{{deduced too few arguments for expanded pack 'X'}}
73 // expected-note@-2 1+{{too many template arguments}}
74 return (X + ... + 0); // expected-warning {{extension}}
75 }
76
gfully_expanded_packs::A77 template<T ...X, int Y> static constexpr int g() {
78 // expected-note@-1 1+{{deduced too few arguments for expanded pack 'X'}}
79 // expected-note@-2 1+{{couldn't infer template argument 'Y'}}
80 // expected-note@-3 1+{{too many template arguments}}
81 return (X + ... + (1000 * Y)); // expected-warning {{extension}}
82 }
83
hfully_expanded_packs::A84 template<T ...X, int Y, T ...Z> static constexpr int h() {
85 // expected-note@-1 1+{{deduced too few arguments for expanded pack 'X'}}
86 // expected-note@-2 1+{{couldn't infer template argument 'Y'}}
87 // expected-note@-3 1+{{deduced too few arguments for expanded pack 'Z'}}
88 // expected-note@-4 1+{{too many template arguments}}
89 return (X + ... + (1000 * Y)) + 1000000 * (Z + ... + 0); // expected-warning 2{{extension}}
90 }
91
ifully_expanded_packs::A92 template<T ...X, int ...Z> static constexpr int i() {
93 return (X + ... + 0) + 1000 * (Z + ... + 0); // expected-warning 2{{extension}}
94 }
95
jfully_expanded_packs::A96 template<T ...X, int Y, int ...Z> static constexpr int j() {
97 return (X + ... + (1000 * Y)) + 1000000 * (Z + ... + 0); // expected-warning 2{{extension}}
98 }
99 };
100
check_invalid_calls()101 void check_invalid_calls() {
102 A<int, int>::f(); // expected-error {{no matching function}}
103 A<int, int>::f<>(); // expected-error {{no matching function}}
104 A<int, int>::f<0>(); // expected-error {{no matching function}}
105 A<int, int>::g(); // expected-error {{no matching function}}
106 A<int, int>::g<>(); // expected-error {{no matching function}}
107 A<int, int>::g<0>(); // expected-error {{no matching function}}
108 A<int, int>::g<0, 0>(); // expected-error {{no matching function}}
109 A<>::f<0>(); // expected-error {{no matching function}}
110 A<>::g(); // expected-error {{no matching function}}
111 A<>::g<>(); // expected-error {{no matching function}}
112 A<>::g<0, 0>(); // expected-error {{no matching function}}
113 A<>::h<>(); // expected-error {{no matching function}}
114 A<int>::h<>(); // expected-error {{no matching function}}
115 A<int>::h<0, 0>(); // expected-error {{no matching function}}
116 A<>::h<0, 0>(); // expected-error {{no matching function}}
117 }
118
119 static_assert(A<>::f() == 0, "");
120 static_assert(A<int>::f<1>() == 1, "");
121 static_assert(A<>::g<1>() == 1000, "");
122 static_assert(A<int>::g<1, 2>() == 2001, "");
123 static_assert(A<>::h<1>() == 1000, "");
124 static_assert(A<int>::h<1, 2, 3>() == 3002001, "");
125 static_assert(A<int, int>::h<1, 20, 3, 4, 50>() == 54003021, "");
126 static_assert(A<>::i<1>() == 1000, "");
127 static_assert(A<int>::i<1>() == 1, "");
128 static_assert(A<>::j<1, 2, 30>() == 32001000, "");
129 static_assert(A<int>::j<1, 2, 3, 40>() == 43002001, "");
130 }
131
132 namespace partial_full_mix {
133 template<typename T, typename U> struct pair {};
134 template<typename ...T> struct tuple {};
135 template<typename ...T> struct A {
136 template<typename ...U> static pair<tuple<T...>, tuple<U...>> f(pair<T, U> ...p);
137 // expected-note@-1 {{[with U = <char, double, long>]: pack expansion contains parameter pack 'U' that has a different length (2 vs. 3) from outer parameter packs}}
138 // expected-note@-2 {{[with U = <char, double, void>]: pack expansion contains parameter pack 'U' that has a different length (at least 3 vs. 2) from outer parameter packs}}
139
140 template<typename ...U> static pair<tuple<T...>, tuple<U...>> g(pair<T, U> ...p, ...);
141 // expected-note@-1 {{[with U = <char, double, long>]: pack expansion contains parameter pack 'U' that has a different length (2 vs. 3) from outer parameter packs}}
142
143 template<typename ...U> static tuple<U...> h(tuple<pair<T, U>..., pair<int, int>>);
144 // expected-note@-1 {{[with U = <int [2]>]: pack expansion contains parameter pack 'U' that has a different length (2 vs. 1) from outer parameter packs}}
145 };
146
147 pair<tuple<int, float>, tuple<char, double>> k1 = A<int, float>().f<char>(pair<int, char>(), pair<float, double>());
148 pair<tuple<int, float>, tuple<char, double>> k2 = A<int, float>().f<char>(pair<int, char>(), pair<float, double>(), pair<void, long>()); // expected-error {{no match}}
149 pair<tuple<int, float>, tuple<char, double>> k3 = A<int, float>().f<char, double, void>(pair<int, char>(), pair<float, double>()); // expected-error {{no match}}
150
151 // FIXME: We should accept this by treating the pack 'p' as having a fixed length of 2 here.
152 pair<tuple<int, float>, tuple<char, double>> k4 = A<int, float>().g<char>(pair<int, char>(), pair<float, double>(), pair<void, long>()); // expected-error {{no match}}
153
154 // FIXME: We should accept this by treating the pack of pairs as having a fixed length of 2 here.
155 tuple<int[2], int[4]> k5 = A<int[1], int[3]>::h<int[2]>(tuple<pair<int[1], int[2]>, pair<int[3], int[4]>, pair<int, int>>()); // expected-error {{no match}}
156 }
157
158 namespace substitution_vs_function_deduction {
159 template <typename... T> struct A {
160 template <typename... U> void f(void(*...)(T, U)); // expected-warning {{ISO C++11 requires a parenthesized pack declaration to have a name}}
161 template <typename... U> void g(void...(T, U)); // expected-note {{could not match 'void (T, U)' against 'void (*)(int, int)'}}
162 };
f(int,int)163 void f(int, int) {
164 A<int>().f(f);
165 // FIXME: We fail to decay the parameter to a pointer type.
166 A<int>().g(f); // expected-error {{no match}}
167 }
168 }
169
170 namespace Nested_Explicit_Specialization {
171 template <typename>
172 struct Outer {
173
174 template <int>
175 struct Inner;
176
177 template <>
178 struct Inner<0> {
179 template <typename... Args>
TestNested_Explicit_Specialization::Outer::Inner180 void Test(Args...) {}
181 };
182 };
183
Run()184 void Run() {
185 Outer<void>::Inner<0>().Test(1,1);
186 }
187 }
188