clang/test/SemaTemplate/extern-templates.cpp

   1 // RUN: %clang_cc1 -triple i686-pc-win32 -fsyntax-only -verify %s -DMS
   2 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu-pc-win32 -fsyntax-only -verify %s
   3
   4 template<typename T>
   5 class X0 {
   6 public:
   7   void f(T t);
   8
   9   struct Inner {
  10     void g(T t);
  11   };
  12 };
  13
  14 template<typename T>
  15 void X0<T>::f(T t) {
  16   t = 17; // expected-error{{incompatible}}
  17 }
  18
  19 extern template class X0<int>;
  20
  21 extern template class X0<int*>;
  22
  23 template<typename T>
  24 void X0<T>::Inner::g(T t) {
  25 #ifdef MS
  26   t = 17; // expected-error{{incompatible integer to pointer conversion assigning to 'long *'}} expected-error{{incompatible integer to pointer conversion assigning to 'int *'}}
  27 #else
  28   t = 17; // expected-error{{incompatible integer to pointer conversion assigning to 'long *'}}
  29 #endif
  30 }
  31
  32 void test_intptr(X0<int*> xi, X0<int*>::Inner xii) {
  33   xi.f(0);
  34 #ifdef MS
  35   xii.g(0); // expected-note {{instantiation}}
  36 #else
  37   xii.g(0);
  38 #endif
  39 }
  40
  41 extern template class X0<long*>;
  42
  43 void test_longptr(X0<long*> xl, X0<long*>::Inner xli) {
  44   xl.f(0);
  45   xli.g(0);
  46 }
  47
  48 template class X0<long*>; // expected-note 2{{instantiation}}
  49
  50 template<typename T>
  51 class X1 {
  52 public:
  53   void f(T t) { t += 2; }
  54
  55   void g(T t);
  56 };
  57
  58 template<typename T>
  59 void X1<T>::g(T t) {
  60   t += 2;
  61 }
  62
  63 extern template class X1<void*>;
  64
  65 void g_X1(X1<void*> x1, void *ptr) {
  66   x1.g(ptr);
  67 }
  68
  69 extern template void X1<const void*>::g(const void*);
  70
  71 void g_X1_2(X1<const void *> x1, const void *ptr) {
  72   x1.g(ptr);
  73 }
  74
  75 namespace static_const_member {
  76   template <typename T> struct A { static const int n; };
  77   template <typename T> const int A<T>::n = 3;
  78   extern template struct A<int>;
  79   int arr[A<int>::n];
  80 }