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64 lines
2.1 KiB
C
64 lines
2.1 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 <tuple>
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#include <type_traits>
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#include "base/memory/ref_counted.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>
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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 =
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(std::is_pointer<T>::value &&
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(std::is_convertible<T, const subtle::RefCountedBase*>::value ||
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std::is_convertible<T,
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const subtle::RefCountedThreadSafeBase*>::value))
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};
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};
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template <typename Params>
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struct ParamsUseScopedRefptrCorrectly {
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enum { value = 0 };
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};
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template <>
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struct ParamsUseScopedRefptrCorrectly<std::tuple<>> {
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enum { value = 1 };
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};
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template <typename Head, typename... Tail>
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struct ParamsUseScopedRefptrCorrectly<std::tuple<Head, Tail...>> {
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enum { value = !NeedsScopedRefptrButGetsRawPtr<Head>::value &&
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ParamsUseScopedRefptrCorrectly<std::tuple<Tail...>>::value };
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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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