clang/test/SemaTemplate/inject-templated-friend.cpp

   1 // RUN: %clang_cc1 %s -emit-llvm -triple %itanium_abi_triple -o - | FileCheck %s
   2 // RUN: %clang_cc1 %s -DREDEFINE -verify
   3 // PR8007: friend function not instantiated.
   4
   5 // CHECK: define linkonce_odr{{.*}}_ZlsR11std_ostreamRK8StreamerI3FooE
   6
   7 struct std_ostream
   8 {
   9   int dummy;
  10 };
  11
  12 std_ostream cout;
  13
  14 template <typename STRUCT_TYPE>
  15 struct Streamer
  16 {
  17     friend std_ostream& operator << (std_ostream& o, const Streamer& f) // expected-error{{redefinition of 'operator<<'}}
  18         {
  19             Streamer s(f);
  20             s(o);
  21             return o;
  22         }
  23
  24     Streamer(const STRUCT_TYPE& s) : s(s) {}
  25
  26     const STRUCT_TYPE& s;
  27     void operator () (std_ostream&) const;
  28 };
  29
  30 typedef struct Foo {} Foo;
  31
  32 inline std_ostream& operator << (std_ostream&, const Streamer<Foo>&);
  33 #ifdef REDEFINE
  34 std_ostream& operator << (std_ostream& o, const Streamer<Foo>&) // expected-note{{is here}}
  35 {
  36   // Sema should flag this as a redefinition
  37   return o;
  38 }
  39 #endif
  40
  41 template <>
  42 void Streamer<Foo>::operator () (std_ostream& o) const // expected-note{{requested here}}
  43 {
  44 }
  45
  46 int main(void)
  47 {
  48     Foo foo;
  49     cout << foo;
  50 }