// (C) Copyright Jonathan Turkanis 2004-2005.
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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// Contains the definition of move_ptrs::default_deleter, the default
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// Deleter template argument to move_ptr. Uses a technique of Daniel
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// Wallin to capture the type of a pointer at the time the deleter
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// is constructed, so that move_ptrs can delete objects of incomplete
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// type by default.
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#ifndef BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED
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#define BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED
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#include <boost/checked_delete.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/type_traits/is_array.hpp>
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#include <boost/type_traits/remove_bounds.hpp>
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namespace boost { namespace ptr_container_detail { namespace move_ptrs {
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namespace ptr_container_detail {
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template<typename T>
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struct deleter_base {
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typedef void (*deleter)(T*);
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deleter_base(deleter d) { delete_ = d; }
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void operator() (T* t) const { delete_(t); }
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static deleter delete_;
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};
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template<class T>
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typename deleter_base<T>::deleter
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deleter_base<T>::delete_;
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template<typename T>
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struct scalar_deleter : deleter_base<T> {
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typedef deleter_base<T> base;
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scalar_deleter() : base(do_delete) { }
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static void do_delete(T* t) { checked_delete(t); }
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};
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template<typename T>
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struct array_deleter
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: deleter_base<typename remove_bounds<T>::type>
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{
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typedef typename remove_bounds<T>::type element_type;
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typedef deleter_base<element_type> base;
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array_deleter() : base(do_delete) { }
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static void do_delete(element_type* t) { checked_array_delete(t); }
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};
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} // End namespace ptr_container_detail.
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template<typename T>
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struct default_deleter
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: mpl::if_<
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is_array<T>,
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ptr_container_detail::array_deleter<T>,
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ptr_container_detail::scalar_deleter<T>
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>::type
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{
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default_deleter() { }
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template<typename TT>
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default_deleter(default_deleter<TT>) { }
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};
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} } } // End namespaces ptr_container_detail, move_ptrs, boost.
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#endif // #ifndef BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED
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