// Copyright (c) 2011 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef BASE_MEMORY_RAW_SCOPED_REFPTR_MISMATCH_CHECKER_H_ #define BASE_MEMORY_RAW_SCOPED_REFPTR_MISMATCH_CHECKER_H_ #include #include "base/memory/raw_ptr.h" #include "base/memory/raw_ref.h" #include "base/template_util.h" // It is dangerous to post a task with a T* argument where T is a subtype of // RefCounted(Base|ThreadSafeBase), since by the time the parameter is used, the // object may already have been deleted since it was not held with a // scoped_refptr. Example: http://crbug.com/27191 // The following set of traits are designed to generate a compile error // whenever this antipattern is attempted. namespace base { // This is a base internal implementation file used by task.h and callback.h. // Not for public consumption, so we wrap it in namespace internal. namespace internal { template struct IsRefCountedType : std::false_type {}; template struct IsRefCountedType()->AddRef()), decltype(std::declval()->Release())>> : std::true_type {}; // Human readable translation: you needed to be a scoped_refptr if you are a raw // pointer type and are convertible to a RefCounted(Base|ThreadSafeBase) type. template struct NeedsScopedRefptrButGetsRawPtr : std::disjunction< // TODO(danakj): Should ban native references and // std::reference_wrapper here too. std::conjunction, IsRefCountedType>>, std::conjunction, IsRefCountedType>>> { static_assert(!std::is_reference::value, "NeedsScopedRefptrButGetsRawPtr requires non-reference type."); }; } // namespace internal } // namespace base #endif // BASE_MEMORY_RAW_SCOPED_REFPTR_MISMATCH_CHECKER_H_