clang/test/CXX/temp/temp.spec/temp.explicit/p4.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s
   2 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
   3
   4 template<typename T> void f0(T); // expected-note{{here}}
   5 template void f0(int); // expected-error{{explicit instantiation of undefined function template}}
   6
   7 template<typename T>
   8 struct X0 {
   9   struct Inner;
  10
  11   void f1(); // expected-note{{here}}
  12
  13   static T value; // expected-note{{here}}
  14 };
  15
  16 template void X0<int>::f1(); // expected-error{{explicit instantiation of undefined member function}}
  17
  18 template int X0<int>::value; // expected-error{{explicit instantiation of undefined static data member}}
  19
  20 template<> void f0(long); // expected-note{{previous template specialization is here}}
  21 template void f0(long); // expected-warning{{explicit instantiation of 'f0<long>' that occurs after an explicit specialization has no effect}}
  22
  23 template<> void X0<long>::f1(); // expected-note{{previous template specialization is here}}
  24 template void X0<long>::f1(); // expected-warning{{explicit instantiation of 'f1' that occurs after an explicit specialization has no effect}}
  25
  26 template<> struct X0<long>::Inner; // expected-note{{previous template specialization is here}}
  27 template struct X0<long>::Inner; // expected-warning{{explicit instantiation of 'Inner' that occurs after an explicit specialization has no effect}}
  28
  29 template<> long X0<long>::value; // expected-note{{previous template specialization is here}}
  30 template long X0<long>::value; // expected-warning{{explicit instantiation of 'value' that occurs after an explicit specialization has no effect}}
  31
  32 template<> struct X0<double>; // expected-note{{previous template specialization is here}}
  33 template struct X0<double>; // expected-warning{{explicit instantiation of 'X0<double>' that occurs after an explicit specialization has no effect}}
  34
  35 // PR 6458
  36 namespace test0 {
  37   template <class T> class foo {
  38     int compare(T x, T y);
  39   };
  40
  41   template <> int foo<char>::compare(char x, char y);
  42   template <class T> int foo<T>::compare(T x, T y) {
  43     // invalid at T=char; if we get a diagnostic here, we're
  44     // inappropriately instantiating this template.
  45     void *ptr = x;
  46   }
  47   extern template class foo<char>; // expected-warning 0-1{{extern templates are a C++11 extension}}
  48   template class foo<char>;
  49 }