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      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