1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/bindings/UnionMember.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,59 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=8 sts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +/* A class for holding the members of a union. */
1.11 +
1.12 +#ifndef mozilla_dom_UnionMember_h
1.13 +#define mozilla_dom_UnionMember_h
1.14 +
1.15 +#include "mozilla/Alignment.h"
1.16 +
1.17 +namespace mozilla {
1.18 +namespace dom {
1.19 +
1.20 +// The union type has an enum to keep track of which of its UnionMembers has
1.21 +// been constructed.
1.22 +template<class T>
1.23 +class UnionMember
1.24 +{
1.25 + AlignedStorage2<T> mStorage;
1.26 +
1.27 +public:
1.28 + T& SetValue()
1.29 + {
1.30 + new (mStorage.addr()) T();
1.31 + return *mStorage.addr();
1.32 + }
1.33 + template <typename T1>
1.34 + T& SetValue(const T1& aValue)
1.35 + {
1.36 + new (mStorage.addr()) T(aValue);
1.37 + return *mStorage.addr();
1.38 + }
1.39 + template<typename T1, typename T2>
1.40 + T& SetValue(const T1& aValue1, const T2& aValue2)
1.41 + {
1.42 + new (mStorage.addr()) T(aValue1, aValue2);
1.43 + return *mStorage.addr();
1.44 + }
1.45 + T& Value()
1.46 + {
1.47 + return *mStorage.addr();
1.48 + }
1.49 + const T& Value() const
1.50 + {
1.51 + return *mStorage.addr();
1.52 + }
1.53 + void Destroy()
1.54 + {
1.55 + mStorage.addr()->~T();
1.56 + }
1.57 +};
1.58 +
1.59 +} // namespace dom
1.60 +} // namespace mozilla
1.61 +
1.62 +#endif // mozilla_dom_UnionMember_h
