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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2012-2013. 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/container for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_CONTAINER_DETAIL_ALLOCATOR_VERSION_TRAITS_HPP
#define BOOST_CONTAINER_DETAIL_ALLOCATOR_VERSION_TRAITS_HPP
#if defined(_MSC_VER)
# pragma once
#endif
#include <boost/container/detail/config_begin.hpp>
#include <boost/container/detail/workaround.hpp>
#include <boost/container/allocator_traits.hpp> //allocator_traits
#include <boost/container/throw_exception.hpp>
#include <boost/container/detail/multiallocation_chain.hpp> //multiallocation_chain
#include <boost/container/detail/version_type.hpp> //version_type
#include <boost/container/detail/allocation_type.hpp> //allocation_type
#include <boost/container/detail/mpl.hpp> //integral_constant
#include <boost/intrusive/pointer_traits.hpp> //pointer_traits
#include <utility> //pair
#include <boost/detail/no_exceptions_support.hpp> //BOOST_TRY
namespace boost {
namespace container {
namespace container_detail {
template<class Allocator, unsigned Version = boost::container::container_detail::version<Allocator>::value>
struct allocator_version_traits
{
typedef ::boost::container::container_detail::integral_constant
<unsigned, Version> alloc_version;
typedef typename Allocator::multiallocation_chain multiallocation_chain;
typedef typename boost::container::allocator_traits<Allocator>::pointer pointer;
typedef typename boost::container::allocator_traits<Allocator>::size_type size_type;
//Node allocation interface
static pointer allocate_one(Allocator &a)
{ return a.allocate_one(); }
static void deallocate_one(Allocator &a, const pointer &p)
{ a.deallocate_one(p); }
static void allocate_individual(Allocator &a, size_type n, multiallocation_chain &m)
{ return a.allocate_individual(n, m); }
static void deallocate_individual(Allocator &a, multiallocation_chain &holder)
{ a.deallocate_individual(holder); }
static std::pair<pointer, bool>
allocation_command(Allocator &a, allocation_type command,
size_type limit_size, size_type preferred_size,
size_type &received_size, const pointer &reuse)
{
return a.allocation_command
(command, limit_size, preferred_size, received_size, reuse);
}
};
template<class Allocator>
struct allocator_version_traits<Allocator, 1>
{
typedef ::boost::container::container_detail::integral_constant
<unsigned, 1> alloc_version;
typedef typename boost::container::allocator_traits<Allocator>::pointer pointer;
typedef typename boost::container::allocator_traits<Allocator>::size_type size_type;
typedef typename boost::container::allocator_traits<Allocator>::value_type value_type;
typedef typename boost::intrusive::pointer_traits<pointer>::
template rebind_pointer<void>::type void_ptr;
typedef container_detail::basic_multiallocation_chain
<void_ptr> multialloc_cached_counted;
typedef boost::container::container_detail::
transform_multiallocation_chain
< multialloc_cached_counted, value_type> multiallocation_chain;
//Node allocation interface
static pointer allocate_one(Allocator &a)
{ return a.allocate(1); }
static void deallocate_one(Allocator &a, const pointer &p)
{ a.deallocate(p, 1); }
static void deallocate_individual(Allocator &a, multiallocation_chain &holder)
{
size_type n = holder.size();
typename multiallocation_chain::iterator it = holder.begin();
while(n--){
pointer p = boost::intrusive::pointer_traits<pointer>::pointer_to(*it);
++it;
a.deallocate(p, 1);
}
}
struct allocate_individual_rollback
{
allocate_individual_rollback(Allocator &a, multiallocation_chain &chain)
: mr_a(a), mp_chain(&chain)
{}
~allocate_individual_rollback()
{
if(mp_chain)
allocator_version_traits::deallocate_individual(mr_a, *mp_chain);
}
void release()
{
mp_chain = 0;
}
Allocator &mr_a;
multiallocation_chain * mp_chain;
};
static void allocate_individual(Allocator &a, size_type n, multiallocation_chain &m)
{
allocate_individual_rollback rollback(a, m);
while(n--){
m.push_front(a.allocate(1));
}
rollback.release();
}
static std::pair<pointer, bool>
allocation_command(Allocator &a, allocation_type command,
size_type, size_type preferred_size,
size_type &received_size, const pointer &)
{
std::pair<pointer, bool> ret(pointer(), false);
if(!(command & allocate_new)){
if(!(command & nothrow_allocation)){
throw_logic_error("version 1 allocator without allocate_new flag");
}
}
else{
received_size = preferred_size;
BOOST_TRY{
ret.first = a.allocate(received_size);
}
BOOST_CATCH(...){
if(!(command & nothrow_allocation)){
BOOST_RETHROW
}
}
BOOST_CATCH_END
}
return ret;
}
};
} //namespace container_detail {
} //namespace container {
} //namespace boost {
#include <boost/container/detail/config_end.hpp>
#endif // ! defined(BOOST_CONTAINER_DETAIL_ALLOCATOR_VERSION_TRAITS_HPP)
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