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

// RUN: %clang_cc1 -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);
  }
};

struct A { void f(); };
struct B : A { };
class C : B { using B::f; };

// PR5751: Resolve overloaded functions through using decls.
namespace O {
  void f(int i);
  void f(double d);
}
namespace P {
  void f();
  void g(void (*ptr)(int));
  using O::f;
  void test() {
    f();
    f(1);
    void (*f_ptr1)(double) = f;
    void (*f_ptr2)() = f;
    g(f);
  }
}