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// helper code for dealing with tracking non-boost shared_ptr/weak_ptr
// Copyright Frank Mori Hess 2009.
// Distributed under the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/signals2 for library home page.
#ifndef BOOST_SIGNALS2_FOREIGN_PTR_HPP
#define BOOST_SIGNALS2_FOREIGN_PTR_HPP
#include <algorithm>
#include <boost/config.hpp>
#include <boost/assert.hpp>
#include <boost/scoped_ptr.hpp>
#include <boost/smart_ptr/bad_weak_ptr.hpp>
#include <boost/utility/swap.hpp>
#ifndef BOOST_NO_CXX11_SMART_PTR
#include <memory>
#endif
namespace boost
{
template<typename T> class shared_ptr;
template<typename T> class weak_ptr;
namespace signals2
{
template<typename WeakPtr> struct weak_ptr_traits
{};
template<typename T> struct weak_ptr_traits<boost::weak_ptr<T> >
{
typedef boost::shared_ptr<T> shared_type;
};
#ifndef BOOST_NO_CXX11_SMART_PTR
template<typename T> struct weak_ptr_traits<std::weak_ptr<T> >
{
typedef std::shared_ptr<T> shared_type;
};
#endif
template<typename SharedPtr> struct shared_ptr_traits
{};
template<typename T> struct shared_ptr_traits<boost::shared_ptr<T> >
{
typedef boost::weak_ptr<T> weak_type;
};
#ifndef BOOST_NO_CXX11_SMART_PTR
template<typename T> struct shared_ptr_traits<std::shared_ptr<T> >
{
typedef std::weak_ptr<T> weak_type;
};
#endif
namespace detail
{
struct foreign_shared_ptr_impl_base
{
virtual ~foreign_shared_ptr_impl_base() {}
virtual void* get() const = 0;
virtual foreign_shared_ptr_impl_base * clone() const = 0;
};
template<typename FSP>
class foreign_shared_ptr_impl: public foreign_shared_ptr_impl_base
{
public:
foreign_shared_ptr_impl(const FSP &p): _p(p)
{}
virtual void * get() const
{
return _p.get();
}
virtual foreign_shared_ptr_impl * clone() const
{
return new foreign_shared_ptr_impl(*this);
}
private:
FSP _p;
};
class foreign_void_shared_ptr
{
public:
foreign_void_shared_ptr():
_p(0)
{}
foreign_void_shared_ptr(const foreign_void_shared_ptr &other):
_p(other._p->clone())
{}
template<typename FSP>
explicit foreign_void_shared_ptr(const FSP &fsp):
_p(new foreign_shared_ptr_impl<FSP>(fsp))
{}
~foreign_void_shared_ptr()
{
delete _p;
}
foreign_void_shared_ptr & operator=(const foreign_void_shared_ptr &other)
{
if(&other == this) return *this;
foreign_void_shared_ptr(other).swap(*this);
return *this;
}
void swap(foreign_void_shared_ptr &other)
{
boost::swap(_p, other._p);
}
private:
foreign_shared_ptr_impl_base *_p;
};
struct foreign_weak_ptr_impl_base
{
virtual ~foreign_weak_ptr_impl_base() {}
virtual foreign_void_shared_ptr lock() const = 0;
virtual bool expired() const = 0;
virtual foreign_weak_ptr_impl_base * clone() const = 0;
};
template<typename FWP>
class foreign_weak_ptr_impl: public foreign_weak_ptr_impl_base
{
public:
foreign_weak_ptr_impl(const FWP &p): _p(p)
{}
virtual foreign_void_shared_ptr lock() const
{
return foreign_void_shared_ptr(_p.lock());
}
virtual bool expired() const
{
return _p.expired();
}
virtual foreign_weak_ptr_impl * clone() const
{
return new foreign_weak_ptr_impl(*this);
}
private:
FWP _p;
};
class foreign_void_weak_ptr
{
public:
foreign_void_weak_ptr()
{}
foreign_void_weak_ptr(const foreign_void_weak_ptr &other):
_p(other._p->clone())
{}
template<typename FWP>
explicit foreign_void_weak_ptr(const FWP &fwp):
_p(new foreign_weak_ptr_impl<FWP>(fwp))
{}
foreign_void_weak_ptr & operator=(const foreign_void_weak_ptr &other)
{
if(&other == this) return *this;
foreign_void_weak_ptr(other).swap(*this);
return *this;
}
void swap(foreign_void_weak_ptr &other)
{
boost::swap(_p, other._p);
}
foreign_void_shared_ptr lock() const
{
return _p->lock();
}
bool expired() const
{
return _p->expired();
}
private:
boost::scoped_ptr<foreign_weak_ptr_impl_base> _p;
};
} // namespace detail
} // namespace signals2
} // namespace boost
#endif // BOOST_SIGNALS2_FOREIGN_PTR_HPP
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