1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
// RUN: %clang_cc1 -std=c++11 -verify %s
template<typename ...T> struct X {};
template<typename T, typename U> struct P {};
namespace Nested {
template<typename ...T> int f1(X<T, T...>... a); // expected-note +{{conflicting types for parameter 'T'}}
template<typename ...T> int f2(P<X<T...>, T> ...a); // expected-note +{{conflicting types for parameter 'T'}}
int a1 = f1(X<int, int, double>(), X<double, int, double>());
int a2 = f1(X<int, int>());
int a3 = f1(X<int>(), X<double>()); // expected-error {{no matching}}
int a4 = f1(X<int, int>(), X<int>()); // expected-error {{no matching}}
int a5 = f1(X<int>(), X<int, int>()); // expected-error {{no matching}}
int a6 = f1(X<int, int, int>(), X<int, int, int>(), X<int, int, int, int>()); // expected-error {{no matching}}
int b1 = f2(P<X<int, double>, int>(), P<X<int, double>, double>());
int b2 = f2(P<X<int, double>, int>(), P<X<int, double>, double>(), P<X<int, double>, char>()); // expected-error {{no matching}}
}
namespace PR14841 {
template<typename T, typename U> struct A {};
template<typename ...Ts> void f(A<Ts...>); // expected-note {{substitution failure [with Ts = <char, short, int>]: too many template arg}}
void g(A<char, short> a) {
f(a);
f<char>(a);
f<char, short>(a);
f<char, short, int>(a); // expected-error {{no matching function}}
}
}
namespace RetainExprPacks {
int f(int a, int b, int c);
template<typename ...Ts> struct X {};
template<typename ...Ts> int g(X<Ts...>, decltype(f(Ts()...)));
int n = g<int, int>(X<int, int, int>(), 0);
}
namespace PR14615 {
namespace comment0 {
template <class A, class...> struct X {};
template <class... B> struct X<int, B...> {
typedef int type;
struct valid {};
};
template <typename A, typename... B, typename T = X<A, B...>,
typename = typename T::valid>
typename T::type check(int);
int i = check<int, char>(1);
}
namespace comment2 {
template <class...> struct X;
template <typename... B, typename X<B...>::type I = 0>
char check(B...); // expected-note {{undefined template 'PR14615::comment2::X<char, int>'}}
void f() { check<char>(1, 2); } // expected-error {{no matching function}}
}
namespace comment3 {
template <class...> struct X;
template <typename... B, typename X<B...>::type I = (typename X<B...>::type)0>
char check(B...); // expected-note {{undefined template 'PR14615::comment3::X<char, int>'}}
void f() { check<char>(1, 2); } // expected-error {{no matching function}}
}
}
namespace fully_expanded_packs {
template<typename ...T> struct A {
template<T ...X> static constexpr int f() {
// expected-note@-1 1+{{deduced too few arguments for expanded pack 'X'}}
// expected-note@-2 1+{{too many template arguments}}
return (X + ... + 0); // expected-warning {{extension}}
}
template<T ...X, int Y> static constexpr int g() {
// expected-note@-1 1+{{deduced too few arguments for expanded pack 'X'}}
// expected-note@-2 1+{{couldn't infer template argument 'Y'}}
// expected-note@-3 1+{{too many template arguments}}
return (X + ... + (1000 * Y)); // expected-warning {{extension}}
}
template<T ...X, int Y, T ...Z> static constexpr int h() {
// expected-note@-1 1+{{deduced too few arguments for expanded pack 'X'}}
// expected-note@-2 1+{{couldn't infer template argument 'Y'}}
// expected-note@-3 1+{{deduced too few arguments for expanded pack 'Z'}}
// expected-note@-4 1+{{too many template arguments}}
return (X + ... + (1000 * Y)) + 1000000 * (Z + ... + 0); // expected-warning 2{{extension}}
}
template<T ...X, int ...Z> static constexpr int i() {
return (X + ... + 0) + 1000 * (Z + ... + 0); // expected-warning 2{{extension}}
}
template<T ...X, int Y, int ...Z> static constexpr int j() {
return (X + ... + (1000 * Y)) + 1000000 * (Z + ... + 0); // expected-warning 2{{extension}}
}
};
void check_invalid_calls() {
A<int, int>::f(); // expected-error {{no matching function}}
A<int, int>::f<>(); // expected-error {{no matching function}}
A<int, int>::f<0>(); // expected-error {{no matching function}}
A<int, int>::g(); // expected-error {{no matching function}}
A<int, int>::g<>(); // expected-error {{no matching function}}
A<int, int>::g<0>(); // expected-error {{no matching function}}
A<int, int>::g<0, 0>(); // expected-error {{no matching function}}
A<>::f<0>(); // expected-error {{no matching function}}
A<>::g(); // expected-error {{no matching function}}
A<>::g<>(); // expected-error {{no matching function}}
A<>::g<0, 0>(); // expected-error {{no matching function}}
A<>::h<>(); // expected-error {{no matching function}}
A<int>::h<>(); // expected-error {{no matching function}}
A<int>::h<0, 0>(); // expected-error {{no matching function}}
A<>::h<0, 0>(); // expected-error {{no matching function}}
}
static_assert(A<>::f() == 0, "");
static_assert(A<int>::f<1>() == 1, "");
static_assert(A<>::g<1>() == 1000, "");
static_assert(A<int>::g<1, 2>() == 2001, "");
static_assert(A<>::h<1>() == 1000, "");
static_assert(A<int>::h<1, 2, 3>() == 3002001, "");
static_assert(A<int, int>::h<1, 20, 3, 4, 50>() == 54003021, "");
static_assert(A<>::i<1>() == 1000, "");
static_assert(A<int>::i<1>() == 1, "");
static_assert(A<>::j<1, 2, 30>() == 32001000, "");
static_assert(A<int>::j<1, 2, 3, 40>() == 43002001, "");
}
namespace partial_full_mix {
template<typename T, typename U> struct pair {};
template<typename ...T> struct tuple {};
template<typename ...T> struct A {
template<typename ...U> static pair<tuple<T...>, tuple<U...>> f(pair<T, U> ...p);
// 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}}
// 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}}
template<typename ...U> static pair<tuple<T...>, tuple<U...>> g(pair<T, U> ...p, ...);
// 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}}
template<typename ...U> static tuple<U...> h(tuple<pair<T, U>..., pair<int, int>>);
// 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}}
};
pair<tuple<int, float>, tuple<char, double>> k1 = A<int, float>().f<char>(pair<int, char>(), pair<float, double>());
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}}
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}}
// FIXME: We should accept this by treating the pack 'p' as having a fixed length of 2 here.
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}}
// FIXME: We should accept this by treating the pack of pairs as having a fixed length of 2 here.
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}}
}
namespace substitution_vs_function_deduction {
template <typename... T> struct A {
template <typename... U> void f(void(*...)(T, U)); // expected-warning {{ISO C++11 requires a parenthesized pack declaration to have a name}}
template <typename... U> void g(void...(T, U)); // expected-note {{could not match 'void (T, U)' against 'void (*)(int, int)'}}
};
void f(int, int) {
A<int>().f(f);
// FIXME: We fail to decay the parameter to a pointer type.
A<int>().g(f); // expected-error {{no match}}
}
}
|
