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66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_ipc_IPDLParamTraits_h
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#define mozilla_ipc_IPDLParamTraits_h
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#include "chrome/common/ipc_message_utils.h"
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#include "ipc/IPCMessageUtilsSpecializations.h"
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#include "mozilla/UniquePtr.h"
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#include "mozilla/Variant.h"
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#include "nsTArray.h"
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#include <type_traits>
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namespace mozilla {
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namespace ipc {
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class IProtocol;
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//
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// IPDLParamTraits was an extended version of ParamTraits. Unlike ParamTraits,
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// IPDLParamTraits passes an additional IProtocol* argument to the
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// write and read methods.
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//
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// Previously this was required for serializing and deserializing types which
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// require knowledge of which protocol they're being sent over, however the
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// actor is now available through `IPC::Message{Writer,Reader}::GetActor()` so
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// the extra argument is no longer necessary. Please use `IPC::ParamTraits` in
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// the future.
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//
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// Types which implement IPDLParamTraits are also supported by ParamTraits.
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//
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template <typename P>
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struct IPDLParamTraits {};
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//
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// WriteIPDLParam and ReadIPDLParam are like IPC::WriteParam and IPC::ReadParam,
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// however, they also accept a redundant extra actor argument.
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//
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// NOTE: WriteIPDLParam takes a universal reference, so that it can support
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// whatever reference type is supported by the underlying ParamTraits::Write
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// implementation.
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//
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template <typename P>
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static MOZ_NEVER_INLINE void WriteIPDLParam(IPC::MessageWriter* aWriter,
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IProtocol* aActor, P&& aParam) {
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MOZ_ASSERT(aActor == aWriter->GetActor());
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IPC::WriteParam(aWriter, std::forward<P>(aParam));
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}
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template <typename P>
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static MOZ_NEVER_INLINE bool ReadIPDLParam(IPC::MessageReader* aReader,
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IProtocol* aActor, P* aResult) {
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MOZ_ASSERT(aActor == aReader->GetActor());
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return IPC::ReadParam(aReader, aResult);
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}
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} // namespace ipc
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} // namespace mozilla
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#endif // defined(mozilla_ipc_IPDLParamTraits_h)
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