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descendent.hpp
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descendent.hpp
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/*
* Copyright (C) 2020 Tusooa Zhu
*
* This file is part of libkazv.
*
* libkazv is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* libkazv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with libkazv. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <memory>
namespace Kazv
{
template<typename T>
class Descendent
{
struct concept
{
virtual ~concept() = default;
virtual const T *ptr() const = 0;
virtual T *ptr() = 0;
virtual std::unique_ptr<concept> clone() const = 0;
};
template<typename U>
struct model : public concept
{
model(U x) : instance(std::move(x)) {}
const T *ptr() const { return &instance; }
T *ptr() { return &instance; }
// or std::unique_ptr<model<U> >(new model<U>(U(instance))) if you do not have C++14
std::unique_ptr<concept> clone() const { return std::make_unique<model<U> >(U(instance)); }
U instance;
};
std::unique_ptr<concept> m_d;
public:
Descendent() : m_d(std::make_unique<model<T>>(T())) {}
template<typename U>
Descendent(U x) : m_d(std::make_unique<model<U> >(std::move(x))) {}
Descendent(const Descendent & that) : m_d(std::move(that.m_d->clone())) {}
Descendent(Descendent && that) : m_d(std::move(that.m_d)) {}
Descendent & operator=(const Descendent &that) { Descendent t(that); *this = std::move(t); return *this; }
Descendent & operator=(Descendent && that) { m_d = std::move(that.m_d); return *this; }
const T *data() const { return m_d->ptr(); }
const T *constData() const { return m_d->ptr(); }
T *data() { return m_d->ptr(); }
const T *operator->() const { return m_d->ptr(); }
T *operator->() { return m_d->ptr(); }
};
}

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