clang/test/SemaCXX/friend-template-redecl.cpp

   1 // RUN: %clang_cc1 -std=c++17 -verify -emit-llvm-only %s
   2
   3 template <class T> void bar(const T &t) { foo(t); }
   4
   5 template <class>
   6 struct HasFriend {
   7   template <class T>
   8   friend void foo(const HasFriend<T> &m) noexcept(false);
   9 };
  10
  11 template <class T>
  12 void foo(const HasFriend<T> &m) noexcept(false) {}
  13
  14 void f() {
  15   HasFriend<int> x;
  16   foo(x);
  17   bar(x);
  18 }
  19
  20 template<typename T> void droid();
  21 struct X {
  22   template<typename T> friend void ::droid();
  23   template<int N> friend void ::droid(); // expected-error {{does not match}}
  24   // FIXME: We should produce a note for the above candidate explaining why
  25   // it's not the droid we're looking for.
  26 };