michael@0: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #ifndef BASE_REFCOUNTED_H_
michael@0: #define BASE_REFCOUNTED_H_
michael@0: 
michael@0: namespace base {
michael@0: 
michael@0: template <typename T>
michael@0: class RefCounted {
michael@0:  public:
michael@0:   RefCounted() {}
michael@0:   ~RefCounted() {}
michael@0: };
michael@0: 
michael@0: template <typename T>
michael@0: class RefCountedThreadSafe {
michael@0:  public:
michael@0:   RefCountedThreadSafe() {}
michael@0:   ~RefCountedThreadSafe() {}
michael@0: };
michael@0: 
michael@0: }  // namespace base
michael@0: 
michael@0: // Ignore classes whose inheritance tree ends in WebKit's RefCounted base
michael@0: // class. Though prone to error, this pattern is very prevalent in WebKit
michael@0: // code, so do not issue any warnings.
michael@0: namespace WebKit {
michael@0: 
michael@0: template <typename T>
michael@0: class RefCounted {
michael@0:  public:
michael@0:   RefCounted() {}
michael@0:   ~RefCounted() {}
michael@0: };
michael@0: 
michael@0: }  // namespace WebKit
michael@0: 
michael@0: // Unsafe; should error.
michael@0: class PublicRefCountedDtorInHeader
michael@0:     : public base::RefCounted<PublicRefCountedDtorInHeader> {
michael@0:  public:
michael@0:   PublicRefCountedDtorInHeader() {}
michael@0:   ~PublicRefCountedDtorInHeader() {}
michael@0: 
michael@0:  private:
michael@0:   friend class base::RefCounted<PublicRefCountedDtorInHeader>;
michael@0: };
michael@0: 
michael@0: // Unsafe; should error.
michael@0: class PublicRefCountedThreadSafeDtorInHeader
michael@0:     : public base::RefCountedThreadSafe<
michael@0:           PublicRefCountedThreadSafeDtorInHeader> {
michael@0:  public:
michael@0:   PublicRefCountedThreadSafeDtorInHeader() {}
michael@0:   ~PublicRefCountedThreadSafeDtorInHeader() {}
michael@0: 
michael@0:  private:
michael@0:   friend class base::RefCountedThreadSafe<
michael@0:       PublicRefCountedThreadSafeDtorInHeader>;
michael@0: };
michael@0: 
michael@0: // Safe; should not have errors.
michael@0: class ProtectedRefCountedDtorInHeader
michael@0:     : public base::RefCounted<ProtectedRefCountedDtorInHeader> {
michael@0:  public:
michael@0:   ProtectedRefCountedDtorInHeader() {}
michael@0: 
michael@0:  protected:
michael@0:   ~ProtectedRefCountedDtorInHeader() {}
michael@0: 
michael@0:  private:
michael@0:   friend class base::RefCounted<ProtectedRefCountedDtorInHeader>;
michael@0: };
michael@0: 
michael@0: // Safe; should not have errors.
michael@0: class PrivateRefCountedDtorInHeader
michael@0:     : public base::RefCounted<PrivateRefCountedDtorInHeader> {
michael@0:  public:
michael@0:   PrivateRefCountedDtorInHeader() {}
michael@0: 
michael@0:  private:
michael@0:   ~PrivateRefCountedDtorInHeader() {}
michael@0:   friend class base::RefCounted<PrivateRefCountedDtorInHeader>;
michael@0: };
michael@0: 
michael@0: // Unsafe; A grandchild class ends up exposing their parent and grandparent's
michael@0: // destructors.
michael@0: class DerivedProtectedToPublicInHeader
michael@0:     : public ProtectedRefCountedDtorInHeader {
michael@0:  public:
michael@0:   DerivedProtectedToPublicInHeader() {}
michael@0:   ~DerivedProtectedToPublicInHeader() {}
michael@0: };
michael@0: 
michael@0: // Unsafe; A grandchild ends up implicitly exposing their parent and
michael@0: // grantparent's destructors.
michael@0: class ImplicitDerivedProtectedToPublicInHeader
michael@0:     : public ProtectedRefCountedDtorInHeader {
michael@0:  public:
michael@0:   ImplicitDerivedProtectedToPublicInHeader() {}
michael@0: };
michael@0: 
michael@0: // Unsafe-but-ignored; should not have errors.
michael@0: class WebKitPublicDtorInHeader
michael@0:     : public WebKit::RefCounted<WebKitPublicDtorInHeader> {
michael@0:  public:
michael@0:   WebKitPublicDtorInHeader() {}
michael@0:   ~WebKitPublicDtorInHeader() {}
michael@0: };
michael@0: 
michael@0: // Unsafe-but-ignored; should not have errors.
michael@0: class WebKitDerivedPublicDtorInHeader
michael@0:     : public WebKitPublicDtorInHeader {
michael@0:  public:
michael@0:   WebKitDerivedPublicDtorInHeader() {}
michael@0:   ~WebKitDerivedPublicDtorInHeader() {}
michael@0: };
michael@0: 
michael@0: #endif  // BASE_REFCOUNTED_H_