From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- dom/bindings/UnionMember.h | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 dom/bindings/UnionMember.h (limited to 'dom/bindings/UnionMember.h') diff --git a/dom/bindings/UnionMember.h b/dom/bindings/UnionMember.h new file mode 100644 index 0000000000..2fba7910fa --- /dev/null +++ b/dom/bindings/UnionMember.h @@ -0,0 +1,45 @@ +/* -*- 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/. */ + +/* A class for holding the members of a union. */ + +#ifndef mozilla_dom_UnionMember_h +#define mozilla_dom_UnionMember_h + +#include "mozilla/Alignment.h" +#include "mozilla/Attributes.h" +#include + +namespace mozilla::dom { + +// The union type has an enum to keep track of which of its UnionMembers has +// been constructed. +template +class UnionMember { + AlignedStorage2 mStorage; + + // Copy construction can't be supported because C++ requires that any enclosed + // T be initialized in a way C++ knows about -- that is, by |new| or similar. + UnionMember(const UnionMember&) = delete; + + public: + UnionMember() = default; + ~UnionMember() = default; + + template + T& SetValue(Args&&... args) { + new (mStorage.addr()) T(std::forward(args)...); + return *mStorage.addr(); + } + + T& Value() { return *mStorage.addr(); } + const T& Value() const { return *mStorage.addr(); } + void Destroy() { mStorage.addr()->~T(); } +} MOZ_INHERIT_TYPE_ANNOTATIONS_FROM_TEMPLATE_ARGS; + +} // namespace mozilla::dom + +#endif // mozilla_dom_UnionMember_h -- cgit v1.2.3