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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
commit | 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch) | |
tree | a31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /ipc/glue/IPDLStructMember.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip |
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'ipc/glue/IPDLStructMember.h')
-rw-r--r-- | ipc/glue/IPDLStructMember.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/ipc/glue/IPDLStructMember.h b/ipc/glue/IPDLStructMember.h new file mode 100644 index 0000000000..d2e3636054 --- /dev/null +++ b/ipc/glue/IPDLStructMember.h @@ -0,0 +1,37 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this file, + * You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_ipc_IPDLStructMember_h +#define mozilla_ipc_IPDLStructMember_h + +#include <type_traits> +#include <utility> +#include "mozilla/Attributes.h" + +namespace mozilla::ipc { + +// For types which are trivially default constructible, like `int`, force the +// value constructor by wrapping the type in this struct. This is an +// implementation detail which will be hidden by the generated IPDL compiler +// code. +template <typename T> +struct IPDLStructMemberWrapper { + template <typename... Args> + MOZ_IMPLICIT IPDLStructMemberWrapper(Args&&... aArgs) + : mVal(std::forward<Args>(aArgs)...) {} + MOZ_IMPLICIT operator T&() { return mVal; } + MOZ_IMPLICIT operator const T&() const { return mVal; } + T mVal{}; +}; + +template <typename T> +using IPDLStructMember = + std::conditional_t<std::is_trivially_default_constructible_v<T>, + IPDLStructMemberWrapper<T>, T>; + +} // namespace mozilla::ipc + +#endif // mozilla_ipc_IPDLStructMember_h |