hanchenye-llvm-project/clang/test/SemaCXX/using-decl-1.cpp

// RUN: clang-cc -fsyntax-only -verify %s

extern "C" { void f(bool); }

namespace std {
  using ::f;
  inline void f() { return f(true); }
}

namespace M {
  void f(float);
}

namespace N {
  using M::f;
  void f(int) { } // expected-note{{previous}}
  
  void f(int) { } // expected-error{{redefinition}}
}

namespace N {
  void f(double);
  void f(long);
}

struct X0 {
  void operator()(int);
  void operator()(long);
};

struct X1 : X0 {
  // FIXME: give this operator() a 'float' parameter to test overloading
  // behavior. It currently fails.
  void operator()();
  using X0::operator();
  
  void test() {
    (*this)(1);
  }
};