mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-28 16:26:10 +03:00
53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
|
// 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 <type_traits>
|
||
|
|
|
||
|
|
#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 <typename T, typename = void>
|
||
|
|
struct IsRefCountedType : std::false_type {};
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
struct IsRefCountedType<T,
|
||
|
|
void_t<decltype(std::declval<T*>()->AddRef()),
|
||
|
|
decltype(std::declval<T*>()->Release())>>
|
||
|
|
: std::true_type {};
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
struct NeedsScopedRefptrButGetsRawPtr {
|
||
|
|
static_assert(!std::is_reference<T>::value,
|
||
|
|
"NeedsScopedRefptrButGetsRawPtr requires non-reference type.");
|
||
|
|
|
||
|
|
enum {
|
||
|
|
// 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.
|
||
|
|
value = std::is_pointer<T>::value &&
|
||
|
|
IsRefCountedType<std::remove_pointer_t<T>>::value
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace internal
|
||
|
|
|
||
|
|
} // namespace base
|
||
|
|
|
||
|
|
#endif // BASE_MEMORY_RAW_SCOPED_REFPTR_MISMATCH_CHECKER_H_
|