2 * Copyright (C) 2012-2020 Euclid Science Ground Segment
4 * This library is free software; you can redistribute it and/or modify it under
5 * the terms of the GNU Lesser General Public License as published by the Free
6 * Software Foundation; either version 3.0 of the License, or (at your option)
9 * This library is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
14 * You should have received a copy of the GNU Lesser General Public License
15 * along with this library; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 * @file InstOrRefHolder.icpp
24 #include <type_traits>
25 #include "AlexandriaKernel/memory_tools.h"
29 namespace InstOrRefHolder_Impl {
31 template <typename InterfaceType, typename InstanceType>
32 struct InstHolder_Impl : public InstOrRefHolder<InterfaceType> {
33 template <typename... Args>
34 InstHolder_Impl(Args... args) : m_instance(std::forward<Args>(args)...) { }
35 virtual ~InstHolder_Impl() = default;
36 InterfaceType& ref() override {
40 InstanceType m_instance;
43 template <typename InterfaceType>
44 struct RefHolder_Impl : public InstOrRefHolder<InterfaceType> {
45 RefHolder_Impl(InterfaceType& ref) : m_reference(ref) { }
46 virtual ~RefHolder_Impl() = default;
47 InterfaceType& ref() override {
48 return m_reference.get();
51 std::reference_wrapper<InterfaceType> m_reference;
54 } // end of namespace InstOrRefHolder_Impl
57 template <typename InterfaceType>
58 template <typename InstanceType, typename... Args>
59 std::unique_ptr<InstOrRefHolder<InterfaceType>> InstOrRefHolder<InterfaceType>::create(Args... args) {
60 static_assert(std::is_same<InterfaceType, InstanceType>::value || std::is_base_of<InterfaceType, InstanceType>::value,
61 "InstanceType must be a subtype of InterfaceType");
62 return make_unique<InstOrRefHolder_Impl::InstHolder_Impl<InterfaceType, InstanceType>>(std::forward<Args>(args)...);
65 template <typename InterfaceType>
66 std::unique_ptr<InstOrRefHolder<InterfaceType>> InstOrRefHolder<InterfaceType>::create(InterfaceType& ref) {
67 return make_unique<InstOrRefHolder_Impl::RefHolder_Impl<InterfaceType>>(ref);
70 } // end of namespace Euclid