llvm-project/clang/test/CXX/class.access/class.access.dcl/p1.cpp

// RUN: %clang_cc1 -fsyntax-only -verify %s

// This is just the test for [namespace.udecl]p4 with 'using'
// uniformly stripped out.

// C++03 [namespace.udecl]p4:
//   A using-declaration used as a member-declaration shall refer to a
//   member of a base class of the class being defined, shall refer to
//   a member of an anonymous union that is a member of a base class
//   of the class being defined, or shall refer to an enumerator for
//   an enumeration type that is a member of a base class of the class
//   being defined.

// There is no directly analogous paragraph in C++0x, and the feature
// works sufficiently differently there that it needs a separate test.

namespace test0 {
  namespace NonClass {
    typedef int type;
    struct hiding {};
    int hiding;
    static union { double union_member; };
    enum tagname { enumerator };
  }

  class Test0 {
    NonClass::type; // expected-error {{not a class}} expected-warning {{access declarations are deprecated}}
    NonClass::hiding; // expected-error {{not a class}} expected-warning {{access declarations are deprecated}}
    NonClass::union_member; // expected-error {{not a class}} expected-warning {{access declarations are deprecated}}
    NonClass::enumerator; // expected-error {{not a class}} expected-warning {{access declarations are deprecated}}
  };
}

struct Opaque0 {};

namespace test1 {
  struct A {
    typedef int type;
    struct hiding {}; // expected-note {{previous use is here}}
    Opaque0 hiding;
    union { double union_member; };
    enum tagname { enumerator };
  };

  struct B : A {
    A::type; // expected-warning {{access declarations are deprecated}}
    A::hiding; // expected-warning {{access declarations are deprecated}}
    A::union_member; // expected-warning {{access declarations are deprecated}}
    A::enumerator; // expected-warning {{access declarations are deprecated}}
    A::tagname; // expected-warning {{access declarations are deprecated}}

    void test0() {
      type t = 0;
    }

    void test1() {
      typedef struct A::hiding local;
      struct hiding _ = local();
    }

    void test2() {
      union hiding _; // expected-error {{tag type that does not match previous}}
    }

    void test3() {
      char array[sizeof(union_member) == sizeof(double) ? 1 : -1];
    }

    void test4() {
      enum tagname _ = enumerator;
    }

    void test5() {
      Opaque0 _ = hiding;
    }
  };
}

namespace test2 {
  struct A {
    typedef int type;
    struct hiding {}; // expected-note {{previous use is here}}
    int hiding;
    union { double union_member; };
    enum tagname { enumerator };
  };

  template <class T> struct B : A {
    A::type; // expected-warning {{access declarations are deprecated}}
    A::hiding; // expected-warning {{access declarations are deprecated}}
    A::union_member; // expected-warning {{access declarations are deprecated}}
    A::enumerator; // expected-warning {{access declarations are deprecated}}
    A::tagname; // expected-warning {{access declarations are deprecated}}

    void test0() {
      type t = 0;
    }

    void test1() {
      typedef struct A::hiding local;
      struct hiding _ = local();
    }

    void test2() {
      union hiding _; // expected-error {{tag type that does not match previous}}
    }

    void test3() {
      char array[sizeof(union_member) == sizeof(double) ? 1 : -1];
    }

    void test4() {
      enum tagname _ = enumerator;
    }

    void test5() {
      Opaque0 _ = hiding;
    }
  };
}

namespace test3 {
  struct hiding {};

  template <class T> struct A {
    typedef int type; // expected-note {{target of using declaration}}
    struct hiding {};
    Opaque0 hiding;
    union { double union_member; };
    enum tagname { enumerator }; // expected-note {{target of using declaration}}
  };

  template <class T> struct B : A<T> {
    A<T>::type; // expected-error {{dependent using declaration resolved to type without 'typename'}} // expected-warning {{access declarations are deprecated}}
    A<T>::hiding; // expected-warning {{access declarations are deprecated}}
    A<T>::union_member; // expected-warning {{access declarations are deprecated}}
    A<T>::enumerator; // expected-warning {{access declarations are deprecated}}
    A<T>::tagname; // expected-error {{dependent using declaration resolved to type without 'typename'}} // expected-warning {{access declarations are deprecated}}

    // FIXME: re-enable these when the various bugs involving tags are fixed
#if 0
    void test1() {
      typedef struct A<T>::hiding local;
      struct hiding _ = local();
    }

    void test2() {
      typedef struct A<T>::hiding local;
      union hiding _ = local();
    }
#endif

    void test3() {
      char array[sizeof(union_member) == sizeof(double) ? 1 : -1];
    }

#if 0
    void test4() {
      enum tagname _ = enumerator;
    }
#endif

    void test5() {
      Opaque0 _ = hiding;
    }
  };

  template struct B<int>; // expected-note {{in instantiation}}
}

namespace test4 {
  struct Base {
    int foo();
  };

  struct Unrelated {
    int foo();
  };

  struct Subclass : Base {
  };

  namespace InnerNS {
    int foo();
  }

  // We should be able to diagnose these without instantiation.
  template <class T> struct C : Base {
    InnerNS::foo; // expected-error {{not a class}} expected-warning {{access declarations are deprecated}}
    Base::bar; // expected-error {{no member named 'bar'}} expected-warning {{access declarations are deprecated}}
    Unrelated::foo; // expected-error {{not a base class}} expected-warning {{access declarations are deprecated}}
    C::foo; // legal in C++03 // expected-warning {{access declarations are deprecated}}
    Subclass::foo; // legal in C++03 // expected-warning {{access declarations are deprecated}}

    int bar(); //expected-note {{target of using declaration}}
    C::bar; // expected-error {{refers to its own class}} expected-warning {{access declarations are deprecated}}
  };
}