92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
/* vim: set sw=4 sts=4 et foldmethod=syntax : */
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/*
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* Copyright (c) 2008, 2009, 2010, 2012 Ciaran McCreesh
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*
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* This file is part of the Paludis package manager. Paludis is free software;
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* you can redistribute it and/or modify it under the terms of the GNU General
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* Public License version 2, as published by the Free Software Foundation.
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*
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* Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef PALUDIS_GUARD_PALUDIS_UTIL_ACTIVE_OBJECT_PTR_HH
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#define PALUDIS_GUARD_PALUDIS_UTIL_ACTIVE_OBJECT_PTR_HH 1
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#include <paludis/util/active_object_ptr-fwd.hh>
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#include <memory>
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#include <mutex>
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namespace paludis
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{
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template <typename T_>
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class ActiveObjectPtr
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{
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private:
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T_ _ptr;
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std::shared_ptr<std::mutex> _mutex;
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class Deref
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{
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private:
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const ActiveObjectPtr * _ptr;
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std::unique_lock<std::mutex> _lock;
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public:
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Deref(const ActiveObjectPtr * p) :
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_ptr(p),
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_lock(*p->_mutex)
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{
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}
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const T_ & operator-> () const
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{
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return _ptr->_ptr;
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}
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};
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friend class Deref;
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public:
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ActiveObjectPtr(const T_ & t) :
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_ptr(t),
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_mutex(std::make_shared<std::mutex>())
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{
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}
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ActiveObjectPtr(const ActiveObjectPtr & other) = default;
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~ActiveObjectPtr() = default;
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ActiveObjectPtr &
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operator= (const ActiveObjectPtr & other)
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{
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if (this != &other)
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{
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_ptr = other._ptr;
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_mutex = other._mutex;
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}
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return *this;
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}
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Deref operator-> () const
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{
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return Deref(this);
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}
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const T_ & value() const
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{
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return Deref(this).operator->();
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}
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};
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}
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#endif
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