comparable_shared_ptr.h

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/*
 * Copyright (C) 2011 Sakari Bergen <sakari.bergen@beatwaves.net>
 * Copyright (C) 2013 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2014 John Emmas <john@creativepost.co.uk>
 *
 * 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include "ardour/libardour_visibility.h"
 
#include <boost/operators.hpp>
 
#include <memory>
 
namespace ARDOUR {
 
template<typename T>
class /*LIBARDOUR_API*/ ComparableSharedPtr : public std::shared_ptr<T>
                          , public boost::less_than_comparable<ComparableSharedPtr<T> >
{
  public:
        ComparableSharedPtr () {}
        template<class Y>
        explicit ComparableSharedPtr (Y * p) : std::shared_ptr<T> (p) {}
 
        template<class Y, class D>
        ComparableSharedPtr (Y * p, D d) : std::shared_ptr<T> (p, d) {}
 
        template<class Y, class D, class A>
        ComparableSharedPtr (Y * p, D d, A a) : std::shared_ptr<T> (p, d, a) {}
 
        ComparableSharedPtr (ComparableSharedPtr const & r) : std::shared_ptr<T> (r) {}
 
        ComparableSharedPtr& operator=(ComparableSharedPtr const& r) {
                std::shared_ptr<T>(r).swap(*this);
                return *this;
        }
 
        template<class Y>
        ComparableSharedPtr(ComparableSharedPtr<Y> const & r) : std::shared_ptr<T> (r) {}
 
        template<class Y>
        ComparableSharedPtr(ComparableSharedPtr<Y> const & r, T * p) : std::shared_ptr<T> (r, p) {}
 
        template<class Y>
        bool operator< (ComparableSharedPtr<Y> const & other) const { return **this < *other; }
};
 
 
} // namespace ARDOUR