1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 /* A class for holding the members of a union. */ 8 9 #ifndef mozilla_dom_UnionMember_h 10 #define mozilla_dom_UnionMember_h 11 12 #include "mozilla/Alignment.h" 13 14 namespace mozilla { 15 namespace dom { 16 17 // The union type has an enum to keep track of which of its UnionMembers has 18 // been constructed. 19 template<class T> 20 class UnionMember 21 { 22 AlignedStorage2<T> mStorage; 23 24 public: SetValue()25 T& SetValue() 26 { 27 new (mStorage.addr()) T(); 28 return *mStorage.addr(); 29 } 30 template <typename T1> SetValue(const T1 & aValue)31 T& SetValue(const T1& aValue) 32 { 33 new (mStorage.addr()) T(aValue); 34 return *mStorage.addr(); 35 } 36 template<typename T1, typename T2> SetValue(const T1 & aValue1,const T2 & aValue2)37 T& SetValue(const T1& aValue1, const T2& aValue2) 38 { 39 new (mStorage.addr()) T(aValue1, aValue2); 40 return *mStorage.addr(); 41 } Value()42 T& Value() 43 { 44 return *mStorage.addr(); 45 } Value()46 const T& Value() const 47 { 48 return *mStorage.addr(); 49 } Destroy()50 void Destroy() 51 { 52 mStorage.addr()->~T(); 53 } 54 }; 55 56 } // namespace dom 57 } // namespace mozilla 58 59 #endif // mozilla_dom_UnionMember_h 60