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/*
* Copyright (C) 2001-2012 Jacek Sieka, arnetheduck on gmail point com
* Copyright (C) 2009-2019 EiskaltDC++ developers
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include "intrusive_ptr.h"
#include <memory>
#include <atomic>
namespace dcpp {
using std::unique_ptr;
using std::forward;
template<typename T>
class intrusive_ptr_base
{
public:
void inc() noexcept {
intrusive_ptr_add_ref(this);
}
void dec() noexcept {
intrusive_ptr_release(this);
}
bool unique(int val = 1) const noexcept {
return (ref <= val);
}
protected:
intrusive_ptr_base() noexcept : ref(0) { }
private:
friend void intrusive_ptr_add_ref(intrusive_ptr_base* p) { ++p->ref; }
friend void intrusive_ptr_release(intrusive_ptr_base* p) { if(--p->ref == 0) { delete static_cast<T*>(p); } }
std::atomic<long> ref;
};
struct DeleteFunction {
template<typename T>
void operator()(const T& p) const { delete p; }
};
} // namespace dcpp
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