clang/test/CXX/temp/temp.spec/p5.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2
   3 template<typename T> inline void f(T) { }
   4 template void f(int); // expected-note{{previous explicit instantiation}}
   5 template void f(int); // expected-error{{duplicate explicit instantiation}}
   6
   7 template<typename T>
   8 struct X0 {
   9   union Inner { };
  10
  11   void f(T) { }
  12
  13   static T value;
  14 };
  15
  16 template<typename T>
  17 T X0<T>::value = 3.14; // expected-warning{{implicit conversion from 'double' to 'int' changes value from 3.14 to 3}}
  18
  19 template struct X0<int>; // expected-note{{previous explicit instantiation}} \
  20                             expected-note{{requested here}}
  21 template struct X0<int>; // expected-error{{duplicate explicit instantiation}}
  22
  23 template void X0<float>::f(float); // expected-note{{previous explicit instantiation}}
  24 template void X0<float>::f(float); // expected-error{{duplicate explicit instantiation}}
  25
  26 template union X0<float>::Inner; // expected-note{{previous explicit instantiation}}
  27 template union X0<float>::Inner; // expected-error{{duplicate explicit instantiation}}
  28
  29 template float X0<float>::value; // expected-note{{previous explicit instantiation}}
  30 template float X0<float>::value; // expected-error{{duplicate explicit instantiation}}
  31
  32 // Make sure that we don't get tricked by redeclarations of nested classes.
  33 namespace NestedClassRedecls {
  34   template<typename T>
  35   struct X {
  36     struct Nested;
  37     friend struct Nested;
  38
  39     struct Nested {
  40       Nested() {}
  41     } nested;
  42   };
  43
  44   X<int> xi;
  45
  46   template struct X<int>;
  47 }