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