163 lines
5.7 KiB
Plaintext
163 lines
5.7 KiB
Plaintext
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2012-2013. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at 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_CONTAINER_DETAIL_ALLOCATOR_VERSION_TRAITS_HPP
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#define BOOST_CONTAINER_DETAIL_ALLOCATOR_VERSION_TRAITS_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/container/detail/config_begin.hpp>
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#include <boost/container/detail/workaround.hpp>
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#include <boost/container/allocator_traits.hpp> //allocator_traits
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#include <boost/container/throw_exception.hpp>
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#include <boost/container/detail/multiallocation_chain.hpp> //multiallocation_chain
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#include <boost/container/detail/version_type.hpp> //version_type
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#include <boost/container/detail/allocation_type.hpp> //allocation_type
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#include <boost/container/detail/mpl.hpp> //integral_constant
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#include <boost/intrusive/pointer_traits.hpp> //pointer_traits
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#include <boost/core/no_exceptions_support.hpp> //BOOST_TRY
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namespace boost {
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namespace container {
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namespace container_detail {
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template<class Allocator, unsigned Version = boost::container::container_detail::version<Allocator>::value>
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struct allocator_version_traits
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{
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typedef ::boost::container::container_detail::integral_constant
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<unsigned, Version> alloc_version;
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typedef typename Allocator::multiallocation_chain multiallocation_chain;
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typedef typename boost::container::allocator_traits<Allocator>::pointer pointer;
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typedef typename boost::container::allocator_traits<Allocator>::size_type size_type;
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//Node allocation interface
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static pointer allocate_one(Allocator &a)
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{ return a.allocate_one(); }
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static void deallocate_one(Allocator &a, const pointer &p)
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{ a.deallocate_one(p); }
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static void allocate_individual(Allocator &a, size_type n, multiallocation_chain &m)
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{ return a.allocate_individual(n, m); }
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static void deallocate_individual(Allocator &a, multiallocation_chain &holder)
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{ a.deallocate_individual(holder); }
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static pointer allocation_command(Allocator &a, allocation_type command,
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size_type limit_size, size_type &prefer_in_recvd_out_size, pointer &reuse)
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{ return a.allocation_command(command, limit_size, prefer_in_recvd_out_size, reuse); }
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};
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template<class Allocator>
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struct allocator_version_traits<Allocator, 1>
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{
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typedef ::boost::container::container_detail::integral_constant
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<unsigned, 1> alloc_version;
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typedef typename boost::container::allocator_traits<Allocator>::pointer pointer;
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typedef typename boost::container::allocator_traits<Allocator>::size_type size_type;
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typedef typename boost::container::allocator_traits<Allocator>::value_type value_type;
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typedef typename boost::intrusive::pointer_traits<pointer>::
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template rebind_pointer<void>::type void_ptr;
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typedef container_detail::basic_multiallocation_chain
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<void_ptr> multialloc_cached_counted;
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typedef boost::container::container_detail::
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transform_multiallocation_chain
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< multialloc_cached_counted, value_type> multiallocation_chain;
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//Node allocation interface
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static pointer allocate_one(Allocator &a)
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{ return a.allocate(1); }
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static void deallocate_one(Allocator &a, const pointer &p)
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{ a.deallocate(p, 1); }
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static void deallocate_individual(Allocator &a, multiallocation_chain &holder)
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{
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size_type n = holder.size();
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typename multiallocation_chain::iterator it = holder.begin();
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while(n--){
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pointer p = boost::intrusive::pointer_traits<pointer>::pointer_to(*it);
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++it;
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a.deallocate(p, 1);
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}
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}
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struct allocate_individual_rollback
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{
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allocate_individual_rollback(Allocator &a, multiallocation_chain &chain)
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: mr_a(a), mp_chain(&chain)
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{}
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~allocate_individual_rollback()
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{
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if(mp_chain)
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allocator_version_traits::deallocate_individual(mr_a, *mp_chain);
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}
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void release()
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{
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mp_chain = 0;
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}
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Allocator &mr_a;
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multiallocation_chain * mp_chain;
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};
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static void allocate_individual(Allocator &a, size_type n, multiallocation_chain &m)
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{
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allocate_individual_rollback rollback(a, m);
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while(n--){
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m.push_front(a.allocate(1));
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}
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rollback.release();
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}
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static pointer allocation_command(Allocator &a, allocation_type command,
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size_type, size_type &prefer_in_recvd_out_size, pointer &reuse)
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{
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pointer ret = pointer();
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if(BOOST_UNLIKELY(!(command & allocate_new) && !(command & nothrow_allocation))){
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throw_logic_error("version 1 allocator without allocate_new flag");
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}
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else{
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BOOST_TRY{
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ret = a.allocate(prefer_in_recvd_out_size);
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}
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BOOST_CATCH(...){
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if(!(command & nothrow_allocation)){
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BOOST_RETHROW
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}
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}
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BOOST_CATCH_END
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reuse = pointer();
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}
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return ret;
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}
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};
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} //namespace container_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 // ! defined(BOOST_CONTAINER_DETAIL_ALLOCATOR_VERSION_TRAITS_HPP)
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