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      1 // RUN: %clang_cc1 -fsyntax-only -verify %s
      2 template<typename T>
      3 class X {
      4 public:
      5   void f(T x); // expected-error{{argument may not have 'void' type}}
      6   void g(T*);
      7 
      8   static int h(T, T); // expected-error {{argument may not have 'void' type}}
      9 };
     10 
     11 int identity(int x) { return x; }
     12 
     13 void test(X<int> *xi, int *ip, X<int(int)> *xf) {
     14   xi->f(17);
     15   xi->g(ip);
     16   xf->f(&identity);
     17   xf->g(identity);
     18   X<int>::h(17, 25);
     19   X<int(int)>::h(identity, &identity);
     20 }
     21 
     22 void test_bad() {
     23   X<void> xv; // expected-note{{in instantiation of template class 'X<void>' requested here}}
     24 }
     25 
     26 template<typename T, typename U>
     27 class Overloading {
     28 public:
     29   int& f(T, T); // expected-note{{previous declaration is here}}
     30   float& f(T, U); // expected-error{{functions that differ only in their return type cannot be overloaded}}
     31 };
     32 
     33 void test_ovl(Overloading<int, long> *oil, int i, long l) {
     34   int &ir = oil->f(i, i);
     35   float &fr = oil->f(i, l);
     36 }
     37 
     38 void test_ovl_bad() {
     39   Overloading<float, float> off; // expected-note{{in instantiation of template class 'Overloading<float, float>' requested here}}
     40 }
     41 
     42 template<typename T>
     43 class HasDestructor {
     44 public:
     45   virtual ~HasDestructor() = 0;
     46 };
     47 
     48 int i = sizeof(HasDestructor<int>); // FIXME: forces instantiation, but
     49                 // the code below should probably instantiate by itself.
     50 int abstract_destructor[__is_abstract(HasDestructor<int>)? 1 : -1];
     51 
     52 
     53 template<typename T>
     54 class Constructors {
     55 public:
     56   Constructors(const T&);
     57   Constructors(const Constructors &other);
     58 };
     59 
     60 void test_constructors() {
     61   Constructors<int> ci1(17);
     62   Constructors<int> ci2 = ci1;
     63 }
     64 
     65 
     66 template<typename T>
     67 struct ConvertsTo {
     68   operator T();
     69 };
     70 
     71 void test_converts_to(ConvertsTo<int> ci, ConvertsTo<int *> cip) {
     72   int i = ci;
     73   int *ip = cip;
     74 }
     75 
     76 // PR4660
     77 template<class T> struct A0 { operator T*(); };
     78 template<class T> struct A1;
     79 
     80 int *a(A0<int> &x0, A1<int> &x1) {
     81   int *y0 = x0;
     82   int *y1 = x1; // expected-error{{no viable conversion}}
     83 }
     84 
     85 struct X0Base {
     86   int &f();
     87   int& g(int);
     88   static double &g(double);
     89 };
     90 
     91 template<typename T>
     92 struct X0 : X0Base {
     93 };
     94 
     95 template<typename U>
     96 struct X1 : X0<U> {
     97   int &f2() {
     98     return X0Base::f();
     99   }
    100 };
    101 
    102 void test_X1(X1<int> x1i) {
    103   int &ir = x1i.f2();
    104 }
    105 
    106 template<typename U>
    107 struct X2 : X0Base, U {
    108   int &f2() { return X0Base::f(); }
    109 };
    110 
    111 template<typename T>
    112 struct X3 {
    113   void test(T x) {
    114     double& d1 = X0Base::g(x);
    115   }
    116 };
    117 
    118 
    119 template struct X3<double>;
    120 
    121 // Don't try to instantiate this, it's invalid.
    122 namespace test1 {
    123   template <class T> class A {};
    124   template <class T> class B {
    125     void foo(A<test1::Undeclared> &a) // expected-error {{no member named 'Undeclared' in namespace 'test1'}}
    126     {}
    127   };
    128   template class B<int>;
    129 }
    130 
    131 namespace PR6947 {
    132   template< class T >
    133   struct X {
    134     int f0( )
    135     {
    136       typedef void ( X::*impl_fun_ptr )( );
    137       impl_fun_ptr pImpl = &X::template
    138         f0_impl1<int>;
    139     }
    140   private:
    141     int f1() {
    142     }
    143     template< class Processor>
    144     void f0_impl1( )
    145     {
    146     }
    147   };
    148 
    149   char g0() {
    150     X<int> pc;
    151     pc.f0();
    152   }
    153 
    154 }
    155 
    156 namespace PR7022 {
    157   template <typename >
    158   struct X1
    159   {
    160     typedef int state_t( );
    161     state_t g ;
    162   };
    163 
    164   template <  typename U = X1<int> > struct X2
    165   {
    166     X2( U = U())
    167     {
    168     }
    169   };
    170 
    171   void m(void)
    172   {
    173     typedef X2<> X2_type;
    174     X2_type c;
    175   }
    176 }
    177 
    178 namespace SameSignatureAfterInstantiation {
    179   template<typename T> struct S {
    180     void f(T *); // expected-note {{previous}}
    181     void f(const T*); // expected-error-re {{multiple overloads of 'f' instantiate to the same signature 'void (const int *){{( __attribute__\(\(thiscall\)\))?}}'}}
    182   };
    183   S<const int> s; // expected-note {{instantiation}}
    184 }
    185