d6075a00e6
This means other headers that need these ParamTraits don't also include all the other things that WebGLIpdl.h needs, like WebGLTypes.h. This reduces the preprocessed size of modules outside of dom/canvas, hopefully improving compilation speed, and reducing breadth of recompiles. Differential Revision: https://phabricator.services.mozilla.com/D229865
44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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_PARAMTRAITS_ISENUMCASE_H
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#define MOZILLA_PARAMTRAITS_ISENUMCASE_H
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#include "ipc/IPCMessageUtils.h"
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#include "IsEnumCase.h"
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#include "mozilla/ipc/IPDLParamTraits.h"
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namespace IPC {
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/*
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`IsEnumCase(T) -> bool` guarantees that we never have false negatives or false
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positives due to adding or removing enum cases to enums, and forgetting to
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update their serializations. Also, it allows enums to be non-continguous, unlike
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ContiguousEnumSerializer.
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*/
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template <class T>
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struct ParamTraits_IsEnumCase {
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static bool Write(MessageWriter* const writer, const T& in) {
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MOZ_ASSERT(mozilla::IsEnumCase(in));
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const auto shadow = static_cast<std::underlying_type_t<T>>(in);
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WriteParam(writer, shadow);
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return true;
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}
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static bool Read(MessageReader* const reader, T* const out) {
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auto shadow = std::underlying_type_t<T>{};
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if (!ReadParam(reader, &shadow)) return false;
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const auto e = mozilla::AsEnumCase<T>(shadow);
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if (!e) return false;
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*out = *e;
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return true;
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}
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};
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} // namespace IPC
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#endif
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