1 // RUN: %clang_cc1 -fsyntax-only -verify %s
2 template<typename T, int N = 2> struct X; // expected-note{{template is declared here}}
3 
4 X<int, 1> *x1;
5 X<int> *x2;
6 
7 X<> *x3; // expected-error{{too few template arguments for class template 'X'}}
8 
9 template<typename U = float, int M> struct X;
10 
11 X<> *x4;
12 
13 template<typename T = int> struct Z { };
14 template struct Z<>;
15 
16 // PR4362
17 template<class T> struct a { };
18 template<> struct a<int> { static const bool v = true; };
19 
20 template<class T, bool = a<T>::v> struct p { }; // expected-error {{no member named 'v'}}
21 
22 template struct p<bool>; // expected-note {{in instantiation of default argument for 'p<bool>' required here}}
23 template struct p<int>;
24 
25 // PR5187
26 template<typename T, typename U>
27 struct A;
28 
29 template<typename T, typename U = T>
30 struct A;
31 
32 template<typename T, typename U>
33 struct A {
34   void f(A<T>);
35 };
36 
37 template<typename T>
38 struct B { };
39 
40 template<>
41 struct B<void> {
42   typedef B<void*> type;
43 };
44 
45 // Nested default arguments for template parameters.
46 template<typename T> struct X1 { };
47 
48 template<typename T>
49 struct X2 {
50   template<typename U = typename X1<T>::type> // expected-error{{no type named 'type' in 'X1<int>'}} \
51                                               // expected-error{{no type named 'type' in 'X1<char>'}}
52   struct Inner1 { }; // expected-note{{template is declared here}}
53 
54   template<T Value = X1<T>::value> // expected-error{{no member named 'value' in 'X1<int>'}} \
55                                    // expected-error{{no member named 'value' in 'X1<char>'}}
56   struct NonType1 { }; // expected-note{{template is declared here}}
57 
58   template<T Value>
59   struct Inner2 { };
60 
61   template<typename U>
62   struct Inner3 {
63     template<typename X = T, typename V = U>
64     struct VeryInner { };
65 
66     template<T Value1 = sizeof(T), T Value2 = sizeof(U),
67              T Value3 = Value1 + Value2>
68     struct NonType2 { };
69   };
70 };
71 
72 X2<int> x2i; // expected-note{{in instantiation of template class 'X2<int>' requested here}}
73 X2<int>::Inner1<float> x2iif;
74 
75 X2<int>::Inner1<> x2bad; // expected-error{{too few template arguments for class template 'Inner1'}}
76 
77 X2<int>::NonType1<'a'> x2_nontype1;
78 X2<int>::NonType1<> x2_nontype1_bad; // expected-error{{too few template arguments for class template 'NonType1'}}
79 
80 // Check multi-level substitution into template type arguments
81 X2<int>::Inner3<float>::VeryInner<> vi;
82 X2<char>::Inner3<int>::NonType2<> x2_deep_nontype; // expected-note{{in instantiation of template class 'X2<char>' requested here}}
83 
84 template<typename T, typename U>
85 struct is_same { static const bool value = false; };
86 
87 template<typename T>
88 struct is_same<T, T> { static const bool value = true; };
89 
90 int array1[is_same<__typeof__(vi),
91                X2<int>::Inner3<float>::VeryInner<int, float> >::value? 1 : -1];
92 
93 int array2[is_same<__typeof(x2_deep_nontype),
94                    X2<char>::Inner3<int>::NonType2<sizeof(char), sizeof(int),
95                                     sizeof(char)+sizeof(int)> >::value? 1 : -1];
96 
97 // Template template parameter defaults
98 template<template<typename T> class X = X2> struct X3 { };
99 int array3[is_same<X3<>, X3<X2> >::value? 1 : -1];
100 
101 struct add_pointer {
102   template<typename T>
103   struct apply {
104     typedef T* type;
105   };
106 };
107 
108 template<typename T, template<typename> class X = T::template apply>
109   struct X4;
110 int array4[is_same<X4<add_pointer>,
111                    X4<add_pointer, add_pointer::apply> >::value? 1 : -1];
112 
113 template<int> struct X5 {}; // expected-note{{has a different type 'int'}}
114 template<long> struct X5b {};
115 template<typename T,
116          template<T> class B = X5> // expected-error{{template template argument has different}} \
117                                    // expected-note{{previous non-type template parameter}}
118   struct X6 {};
119 
120 X6<int> x6a;
121 X6<long> x6b; // expected-note{{while checking a default template argument}}
122 X6<long, X5b> x6c;
123 
124 
125 template<template<class> class X = B<int> > struct X7; // expected-error{{must be a class template}}
126 
127 namespace PR9643 {
128   template<typename T> class allocator {};
129   template<typename T, typename U = allocator<T> > class vector {};
130 
131   template<template<typename U, typename = allocator<U> > class container,
132            typename DT>
133   container<DT> initializer(const DT& d) {
134     return container<DT>();
135   }
136 
137   void f() {
138     vector<int, allocator<int> > v = initializer<vector>(5);
139   }
140 }
141 
142 namespace PR16288 {
143   template<typename X>
144   struct S {
145     template<typename T = int, typename U> // expected-warning {{C++11}}
146     void f();
147   };
148   template<typename X>
149   template<typename T, typename U>
150   void S<X>::f() {}
151 }
152 
153 namespace DR1635 {
154   template <class T> struct X {
155     template <class U = typename T::type> static void f(int) {} // expected-error {{type 'int' cannot be used prior to '::' because it has no members}} \
156                                                                 // expected-warning {{C++11}}
157     static void f(...) {}
158   };
159 
160   int g() { X<int>::f(0); } // expected-note {{in instantiation of template class 'DR1635::X<int>' requested here}}
161 }
162