llvm-project/clang/test/SemaCXX/warn-overloaded-virtual.cpp

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

struct B1 {
  virtual void foo(int); // expected-note {{declared here}}
  virtual void foo(); // expected-note {{declared here}}
};

struct S1 : public B1 {
  void foo(float); // expected-warning {{hides overloaded virtual functions}}
};

struct S2 : public B1 {
  void foo(); // expected-note {{declared here}}
};

struct B2 {
  virtual void foo(void*); // expected-note {{declared here}}
};

struct MS1 : public S2, public B2 {
   virtual void foo(int); // expected-warning {{hides overloaded virtual functions}}
};

struct B3 {
  virtual void foo(int);
  virtual void foo();
};

struct S3 : public B3 {
  using B3::foo;
  void foo(float);
};

struct B4 {
  virtual void foo();
};

struct S4 : public B4 {
  void foo(float);
  void foo();
};

namespace PR9182 {
struct Base {
  virtual void foo(int);
};

void Base::foo(int) { }

struct Derived : public Base {
  virtual void foo(int);
  void foo(int, int);
};
}

namespace PR9396 {
class A {
public:
  virtual void f(int) {}
};

class B : public A {
public:
  static void f() {}
};
}

namespace ThreeLayer {
struct A {
  virtual void f();
};

struct B: A {
  void f();
  void f(int);
};

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

namespace UnbalancedVirtual {
struct Base {
  virtual void func();
};

struct Derived1: virtual Base {
  virtual void func();
};

struct Derived2: virtual Base {
};

struct MostDerived: Derived1, Derived2 {
  void func(int);
  void func();
};
}

namespace UnbalancedVirtual2 {
struct Base {
  virtual void func();
};

struct Derived1: virtual Base {
  virtual void func();
};

struct Derived2: virtual Base {
};

struct Derived3: Derived1 {
  virtual void func();
};

struct MostDerived: Derived3, Derived2 {
  void func(int);
  void func();
};
}

namespace {
  class A {
    virtual int foo(bool) const;
    // expected-note@-1{{type mismatch at 1st parameter ('bool' vs 'int')}}
    virtual int foo(int, int) const;
    // expected-note@-1{{different number of parameters (2 vs 1)}}
    virtual int foo(int*) const;
    // expected-note@-1{{type mismatch at 1st parameter ('int *' vs 'int')}}
    virtual int foo(int) volatile;
    // expected-note@-1{{different qualifiers (volatile vs const)}}
  };

  class B : public A {
    virtual int foo(int) const;
    // expected-warning@-1{{hides overloaded virtual functions}}
  };
}

namespace {
struct base {
  void f(char) {}
};

struct derived : base {
  void f(int) {}
};

void foo(derived &d) {
  d.f('1'); // FIXME: this should warn about calling (anonymous namespace)::derived::f(int)
            // instead of (anonymous namespace)::base::f(char).
            // Note: this should be under a new diagnostic flag and eventually moved to a
            // new test case since it's not strictly related to virtual functions.
  d.f(12);  // This should not warn.
}
}