155 lines
3.8 KiB
C++
155 lines
3.8 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2011.
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (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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//
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// See http://www.boost.org/libs/container for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_CONTAINERS_DESTROYERS_HPP
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#define BOOST_CONTAINERS_DESTROYERS_HPP
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#if (defined _MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif
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#include "config_begin.hpp"
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#include <boost/container/detail/workaround.hpp>
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#include <boost/container/detail/version_type.hpp>
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#include <boost/container/detail/utilities.hpp>
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namespace boost {
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namespace container {
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namespace containers_detail {
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//!A deleter for scoped_ptr that deallocates the memory
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//!allocated for an array of objects using a STL allocator.
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template <class Allocator>
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struct scoped_array_deallocator
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{
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typedef typename Allocator::pointer pointer;
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typedef typename Allocator::size_type size_type;
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scoped_array_deallocator(pointer p, Allocator& a, size_type length)
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: m_ptr(p), m_alloc(a), m_length(length) {}
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~scoped_array_deallocator()
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{ if (m_ptr) m_alloc.deallocate(m_ptr, m_length); }
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void release()
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{ m_ptr = 0; }
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private:
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pointer m_ptr;
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Allocator& m_alloc;
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size_type m_length;
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};
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template <class Allocator>
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struct null_scoped_array_deallocator
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{
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typedef typename Allocator::pointer pointer;
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typedef typename Allocator::size_type size_type;
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null_scoped_array_deallocator(pointer, Allocator&, size_type)
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{}
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void release()
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{}
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};
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//!A deleter for scoped_ptr that destroys
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//!an object using a STL allocator.
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template <class Allocator>
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struct scoped_destructor_n
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{
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typedef typename Allocator::pointer pointer;
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typedef typename Allocator::value_type value_type;
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typedef typename Allocator::size_type size_type;
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pointer m_p;
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size_type m_n;
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scoped_destructor_n(pointer p, size_type n)
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: m_p(p), m_n(n)
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{}
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void release()
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{ m_p = 0; }
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void increment_size(size_type inc)
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{ m_n += inc; }
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~scoped_destructor_n()
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{
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if(!m_p) return;
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value_type *raw_ptr = containers_detail::get_pointer(m_p);
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for(size_type i = 0; i < m_n; ++i, ++raw_ptr)
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raw_ptr->~value_type();
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}
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};
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//!A deleter for scoped_ptr that destroys
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//!an object using a STL allocator.
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template <class Allocator>
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struct null_scoped_destructor_n
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{
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typedef typename Allocator::pointer pointer;
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typedef typename Allocator::size_type size_type;
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null_scoped_destructor_n(pointer, size_type)
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{}
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void increment_size(size_type)
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{}
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void release()
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{}
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};
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template <class A>
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class allocator_destroyer
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{
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typedef typename A::value_type value_type;
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typedef containers_detail::integral_constant<unsigned,
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boost::container::containers_detail::
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version<A>::value> alloc_version;
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typedef containers_detail::integral_constant<unsigned, 1> allocator_v1;
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typedef containers_detail::integral_constant<unsigned, 2> allocator_v2;
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private:
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A & a_;
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private:
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void priv_deallocate(const typename A::pointer &p, allocator_v1)
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{ a_.deallocate(p, 1); }
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void priv_deallocate(const typename A::pointer &p, allocator_v2)
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{ a_.deallocate_one(p); }
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public:
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allocator_destroyer(A &a)
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: a_(a)
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{}
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void operator()(const typename A::pointer &p)
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{
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containers_detail::get_pointer(p)->~value_type();
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priv_deallocate(p, alloc_version());
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}
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};
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} //namespace containers_detail {
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} //namespace container {
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} //namespace boost {
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#include <boost/container/detail/config_end.hpp>
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#endif //#ifndef BOOST_CONTAINERS_DESTROYERS_HPP
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