1 // RUN: %clang_cc1 -fsyntax-only -verify %s
2 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s
3 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
4
5 template<typename T>
6 const T& min(const T&, const T&); // expected-note{{candidate template ignored: deduced conflicting types for parameter 'T' ('int' vs. 'long')}}
7
test_min()8 void test_min() {
9 (void)min(1, 2l); // expected-error{{no matching function for call to 'min'}}
10 }
11
12 template<typename R, typename T>
13 R *dyn_cast(const T&); // expected-note{{candidate template ignored: couldn't infer template argument 'R'}}
14
test_dyn_cast(int * ptr)15 void test_dyn_cast(int* ptr) {
16 (void)dyn_cast(ptr); // expected-error{{no matching function for call to 'dyn_cast'}}
17 }
18
19 template<int I, typename T>
20 void get(const T&); // expected-note{{candidate template ignored: invalid explicitly-specified argument for template parameter 'I'}}
21 template<template<class T> class, typename T>
22 void get(const T&); // expected-note{{candidate template ignored: invalid explicitly-specified argument for 1st template parameter}}
23
test_get(void * ptr)24 void test_get(void *ptr) {
25 get<int>(ptr); // expected-error{{no matching function for call to 'get'}}
26 }
27
28 template<typename T>
29 typename T::type get_type(const T&); // expected-note{{candidate template ignored: substitution failure [with T = int *]: type 'int *' cannot be used prior to '::'}}
30 template<typename T>
31 void get_type(T *, int[(int)sizeof(T) - 9] = 0); // expected-note{{candidate template ignored: substitution failure [with T = int]: array size is negative}}
32
test_get_type(int * ptr)33 void test_get_type(int *ptr) {
34 (void)get_type(ptr); // expected-error{{no matching function for call to 'get_type'}}
35 }
36
37 struct X {
38 template<typename T>
39 const T& min(const T&, const T&); // expected-note{{candidate template ignored: deduced conflicting types for parameter 'T' ('int' vs. 'long')}}
40 };
41
test_X_min(X x)42 void test_X_min(X x) {
43 (void)x.min(1, 2l); // expected-error{{no matching member function for call to 'min'}}
44 }
45
46 namespace boost {
47 template<bool, typename = void> struct enable_if {};
48 template<typename T> struct enable_if<true, T> { typedef T type; };
49 }
50 template<typename T> typename boost::enable_if<sizeof(T) == 4, int>::type if_size_4(); // expected-note{{candidate template ignored: requirement 'sizeof(char) == 4' was not satisfied [with T = char]}}
51 int k = if_size_4<char>(); // expected-error{{no matching function}}
52
53 namespace llvm {
54 template<typename Cond, typename T = void> struct enable_if : boost::enable_if<Cond::value, T> {};
55 }
56 template<typename T> struct is_int { enum { value = false }; };
57 template<> struct is_int<int> { enum { value = true }; };
58 template<typename T> typename llvm::enable_if<is_int<T> >::type if_int(); // expected-note{{candidate template ignored: disabled by 'enable_if' [with T = char]}}
test_if_int()59 void test_if_int() {
60 if_int<char>(); // expected-error{{no matching function}}
61 }
62
63 template<typename T> struct NonTemplateFunction {
64 typename boost::enable_if<sizeof(T) == 4, int>::type f(); // expected-error{{failed requirement 'sizeof(char) == 4'; 'enable_if' cannot be used to disable this declaration}}
65 };
66 NonTemplateFunction<char> NTFC; // expected-note{{here}}
67
68 namespace NS1 {
69 template <class A>
70 class array {};
71 }
72
73 namespace NS2 {
74 template <class A>
75 class array {};
76 }
77
78 template <class A>
79 void foo(NS2::array<A>); // expected-note{{candidate template ignored: could not match 'NS2::array' against 'NS1::array'}}
80
test()81 void test() {
82 foo(NS1::array<int>()); // expected-error{{no matching function for call to 'foo'}}
83 }
84
85 namespace std {
86 template<bool, typename = void> struct enable_if {};
87 template<typename T> struct enable_if<true, T> { typedef T type; };
88
89 template<typename T, T V> struct integral_constant { static const T value = V; };
90 typedef integral_constant<bool, false> false_type;
91 typedef integral_constant<bool, true> true_type;
92 };
93
94 namespace PR15673 {
95 template<typename T>
96 struct a_trait : std::false_type {};
97
98 template<typename T,
99 typename Requires = typename std::enable_if<a_trait<T>::value>::type>
100 #if __cplusplus <= 199711L
101 // expected-warning@-2 {{default template arguments for a function template are a C++11 extension}}
102 #endif
103 // expected-note@+1 {{candidate template ignored: requirement 'a_trait<int>::value' was not satisfied [with T = int]}}
foo()104 void foo() {}
bar()105 void bar() { foo<int>(); } // expected-error {{no matching function for call to 'foo'}}
106
107
108 template<typename T>
109 struct some_trait : std::false_type {};
110
111 // FIXME: It would be nice to tunnel the 'disabled by enable_if' diagnostic through here.
112 template<typename T>
113 struct a_pony : std::enable_if<some_trait<T>::value> {};
114
115 template<typename T,
116 typename Requires = typename a_pony<T>::type>
117 #if __cplusplus <= 199711L
118 // expected-warning@-2 {{default template arguments for a function template are a C++11 extension}}
119 #endif
120 // FIXME: The source location here is poor.
baz()121 void baz() { } // expected-note {{candidate template ignored: substitution failure [with T = int]: no type named 'type' in 'PR15673::a_pony<int>'}}
quux()122 void quux() { baz<int>(); } // expected-error {{no matching function for call to 'baz'}}
123
124
125 // FIXME: This note doesn't make it clear which candidate we rejected.
126 template <typename T>
127 using unicorns = typename std::enable_if<some_trait<T>::value>::type;
128 #if __cplusplus <= 199711L
129 // expected-warning@-2 {{alias declarations are a C++11 extension}}
130 #endif
131 // expected-note@+7 {{candidate template ignored: requirement 'some_trait<int>::value' was not satisfied [with T = int]}}
132
133 template<typename T,
134 typename Requires = unicorns<T> >
135 #if __cplusplus <= 199711L
136 // expected-warning@-2 {{default template arguments for a function template are a C++11 extension}}
137 #endif
wibble()138 void wibble() {}
wobble()139 void wobble() { wibble<int>(); } // expected-error {{no matching function for call to 'wibble'}}
140
141 template<typename T>
142 struct some_passing_trait : std::true_type {};
143
144 #if __cplusplus <= 199711L
145 // expected-warning@+4 {{default template arguments for a function template are a C++11 extension}}
146 // expected-warning@+4 {{default template arguments for a function template are a C++11 extension}}
147 #endif
148 template<typename T,
149 int n = 42,
150 typename std::enable_if<n == 43 || (some_passing_trait<T>::value && some_trait<T>::value), int>::type = 0>
151 void almost_rangesv3(); // expected-note{{candidate template ignored: requirement '42 == 43 || (some_passing_trait<int>::value && some_trait<int>::value)' was not satisfied}}
test_almost_rangesv3()152 void test_almost_rangesv3() { almost_rangesv3<int>(); } // expected-error{{no matching function for call to 'almost_rangesv3'}}
153
154 #define CONCEPT_REQUIRES_(...) \
155 int x = 42, \
156 typename std::enable_if<(x == 43) || (__VA_ARGS__)>::type = 0
157
158 #if __cplusplus <= 199711L
159 // expected-warning@+4 {{default template arguments for a function template are a C++11 extension}}
160 // expected-warning@+3 {{default template arguments for a function template are a C++11 extension}}
161 #endif
162 template<typename T,
163 CONCEPT_REQUIRES_(some_passing_trait<T>::value && some_trait<T>::value)>
164 void rangesv3(); // expected-note{{candidate template ignored: requirement 'some_trait<int>::value' was not satisfied [with T = int, x = 42]}}
test_rangesv3()165 void test_rangesv3() { rangesv3<int>(); } // expected-error{{no matching function for call to 'rangesv3'}}
166 }
167