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fc898b85f5
Previously, we would always generate a default constructor for IPDL structs which explicitly initializes every member. This would require members to have default initializers statically. With the new approach, each member is individually wrapped with a template parameter which will try to ensure value initiaization, and the default constructor is implemented with `= default;`. The default constructor will produce a warning on clang if it is implicitly deleted, so that warning is also suppressed. Differential Revision: https://phabricator.services.mozilla.com/D168881
38 lines
1.3 KiB
C++
38 lines
1.3 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_ipc_IPDLStructMember_h
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#define mozilla_ipc_IPDLStructMember_h
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#include <type_traits>
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#include <utility>
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#include "mozilla/Attributes.h"
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namespace mozilla::ipc {
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// For types which are trivially default constructible, like `int`, force the
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// value constructor by wrapping the type in this struct. This is an
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// implementation detail which will be hidden by the generated IPDL compiler
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// code.
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template <typename T>
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struct IPDLStructMemberWrapper {
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template <typename... Args>
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MOZ_IMPLICIT IPDLStructMemberWrapper(Args&&... aArgs)
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: mVal(std::forward<Args>(aArgs)...) {}
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MOZ_IMPLICIT operator T&() { return mVal; }
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MOZ_IMPLICIT operator const T&() const { return mVal; }
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T mVal{};
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};
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template <typename T>
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using IPDLStructMember =
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std::conditional_t<std::is_trivially_default_constructible_v<T>,
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IPDLStructMemberWrapper<T>, T>;
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} // namespace mozilla::ipc
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#endif // mozilla_ipc_IPDLStructMember_h
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