85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
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// DEPRECATED in favor of adl_postconstruct and adl_predestruct with
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// deconstruct<T>().
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// A factory function for creating a shared_ptr that enhances the plain
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// shared_ptr constructors by adding support for postconstructors
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// and predestructors through the boost::signals2::postconstructible and
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// boost::signals2::predestructible base classes.
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//
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// Copyright Frank Mori Hess 2007-2008.
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//
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// Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_SIGNALS2_DECONSTRUCT_PTR_HPP
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#define BOOST_SIGNALS2_DECONSTRUCT_PTR_HPP
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#include <boost/assert.hpp>
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#include <boost/checked_delete.hpp>
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#include <boost/signals2/postconstructible.hpp>
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#include <boost/signals2/predestructible.hpp>
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#include <boost/shared_ptr.hpp>
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namespace boost
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{
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namespace signals2
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{
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namespace detail
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{
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inline void do_postconstruct(const postconstructible *ptr)
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{
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postconstructible *nonconst_ptr = const_cast<postconstructible*>(ptr);
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nonconst_ptr->postconstruct();
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}
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inline void do_postconstruct(...)
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{
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}
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inline void do_predestruct(...)
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{
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}
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inline void do_predestruct(const predestructible *ptr)
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{
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try
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{
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predestructible *nonconst_ptr = const_cast<predestructible*>(ptr);
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nonconst_ptr->predestruct();
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}
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catch(...)
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{
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BOOST_ASSERT(false);
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}
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}
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}
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template<typename T> class predestructing_deleter
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{
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public:
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void operator()(const T *ptr) const
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{
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detail::do_predestruct(ptr);
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checked_delete(ptr);
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}
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};
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template<typename T>
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shared_ptr<T> deconstruct_ptr(T *ptr)
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{
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if(ptr == 0) return shared_ptr<T>(ptr);
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shared_ptr<T> shared(ptr, boost::signals2::predestructing_deleter<T>());
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detail::do_postconstruct(ptr);
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return shared;
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}
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template<typename T, typename D>
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shared_ptr<T> deconstruct_ptr(T *ptr, D deleter)
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{
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shared_ptr<T> shared(ptr, deleter);
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if(ptr == 0) return shared;
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detail::do_postconstruct(ptr);
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return shared;
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}
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}
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}
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#endif // BOOST_SIGNALS2_DECONSTRUCT_PTR_HPP
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