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https://bitbucket.org/chromiumembedded/cef
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76 lines
3.3 KiB
C++
76 lines
3.3 KiB
C++
// Copyright (c) 2011 Google Inc. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the name Chromium Embedded
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// Framework nor the names of its contributors may be used to endorse
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// or promote products derived from this software without specific prior
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// written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Do not include this header file directly. Use base/cef_callback.h instead.
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#ifndef CEF_INCLUDE_BASE_INTERNAL_CEF_RAW_SCOPED_REFPTR_MISMATCH_CHECKER_H_
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#define CEF_INCLUDE_BASE_INTERNAL_CEF_RAW_SCOPED_REFPTR_MISMATCH_CHECKER_H_
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#include <type_traits>
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#include "include/base/cef_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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// Human readable translation: you needed to be a scoped_refptr if you are a raw
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// pointer type and are convertible to a RefCounted(Base|ThreadSafeBase) type.
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template <typename T>
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struct NeedsScopedRefptrButGetsRawPtr
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: conjunction<std::is_pointer<T>,
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IsRefCountedType<std::remove_pointer_t<T>>> {
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static_assert(!std::is_reference<T>::value,
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"NeedsScopedRefptrButGetsRawPtr requires non-reference type.");
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};
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} // namespace internal
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} // namespace base
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#endif // CEF_INCLUDE_BASE_INTERNAL_CEF_RAW_SCOPED_REFPTR_MISMATCH_CHECKER_H_
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