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