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 //////////////////////////////////////////////////////////////////////////////
 //
 // (C) Copyright Ion Gaztanaga 2005-2012. 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/interprocess for documentation.
 //
 //////////////////////////////////////////////////////////////////////////////
 
 #ifndef BOOST_INTERPROCESS_NODE_ALLOCATOR_HPP
 #define BOOST_INTERPROCESS_NODE_ALLOCATOR_HPP
 
 #ifndef BOOST_CONFIG_HPP
 #  include <boost/config.hpp>
 #endif
 #
 #if defined(BOOST_HAS_PRAGMA_ONCE)
 #  pragma once
 #endif
 
 #include <boost/interprocess/detail/config_begin.hpp>
 #include <boost/interprocess/detail/workaround.hpp>
 
 #include <boost/intrusive/pointer_traits.hpp>
 
 #include <boost/interprocess/interprocess_fwd.hpp>
 #include <boost/assert.hpp>
 #include <boost/static_assert.hpp>
 #include <boost/utility/addressof.hpp>
 #include <boost/interprocess/detail/utilities.hpp>
 #include <boost/interprocess/detail/type_traits.hpp>
 #include <boost/interprocess/allocators/detail/node_pool.hpp>
 #include <boost/interprocess/containers/version_type.hpp>
 #include <boost/container/detail/multiallocation_chain.hpp>
 #include <boost/interprocess/exceptions.hpp>
 #include <boost/interprocess/allocators/detail/allocator_common.hpp>
 #include <boost/move/adl_move_swap.hpp>
 #include <cstddef>
 
 //!\file
 //!Describes node_allocator pooled shared memory STL compatible allocator
 
 namespace boost {
 namespace interprocess {
 
 #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
 
 namespace ipcdetail{
 
 template < unsigned int Version
          , class T
          , class SegmentManager
          , std::size_t NodesPerBlock
          >
 class node_allocator_base
    : public node_pool_allocation_impl
    < node_allocator_base
       < Version, T, SegmentManager, NodesPerBlock>
    , Version
    , T
    , SegmentManager
    >
 {
    public:
    typedef typename SegmentManager::void_pointer         void_pointer;
    typedef SegmentManager                                segment_manager;
    typedef node_allocator_base
       <Version, T, SegmentManager, NodesPerBlock>   self_t;
 
    #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
 
    template <int dummy>
    struct node_pool
    {
       typedef ipcdetail::shared_node_pool
       < SegmentManager, sizeof_value<T>::value, NodesPerBlock> type;
 
       static type *get(void *p)
       {  return static_cast<type*>(p);  }
    };
    #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 
    BOOST_STATIC_ASSERT((Version <=2));
 
    public:
    //-------
    typedef typename boost::intrusive::
       pointer_traits<void_pointer>::template
          rebind_pointer<T>::type                         pointer;
    typedef typename boost::intrusive::
       pointer_traits<void_pointer>::template
          rebind_pointer<const T>::type                   const_pointer;
    typedef T                                             value_type;
    typedef typename ipcdetail::add_reference
                      <value_type>::type                  reference;
    typedef typename ipcdetail::add_reference
                      <const value_type>::type            const_reference;
    typedef typename segment_manager::size_type           size_type;
    typedef typename segment_manager::difference_type     difference_type;
 
    typedef boost::interprocess::version_type<node_allocator_base, Version>   version;
    typedef boost::container::dtl::transform_multiallocation_chain
       <typename SegmentManager::multiallocation_chain, T>multiallocation_chain;
 
    //!Obtains node_allocator_base from
    //!node_allocator_base
    template<class T2>
    struct rebind
    {
       typedef node_allocator_base<Version, T2, SegmentManager, NodesPerBlock>       other;
    };
 
    #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
    private:
    //!Not assignable from related node_allocator_base
    template<unsigned int Version2, class T2, class SegmentManager2, std::size_t N2>
    node_allocator_base& operator=
       (const node_allocator_base<Version2, T2, SegmentManager2, N2>&);
 
    //!Not assignable from other node_allocator_base
    //node_allocator_base& operator=(const node_allocator_base&);
    #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 
    public:
    //!Constructor from a segment manager. If not present, constructs a node
    //!pool. Increments the reference count of the associated node pool.
    //!Can throw boost::interprocess::bad_alloc
    node_allocator_base(segment_manager *segment_mngr)
       : mp_node_pool(ipcdetail::get_or_create_node_pool<typename node_pool<0>::type>(segment_mngr)) { }
 
    //!Copy constructor from other node_allocator_base. Increments the reference
    //!count of the associated node pool. Never throws
    node_allocator_base(const node_allocator_base &other)
       : mp_node_pool(other.get_node_pool())
    {
       node_pool<0>::get(ipcdetail::to_raw_pointer(mp_node_pool))->inc_ref_count();
    }
 
    //!Copy constructor from related node_allocator_base. If not present, constructs
    //!a node pool. Increments the reference count of the associated node pool.
    //!Can throw boost::interprocess::bad_alloc
    template<class T2>
    node_allocator_base
       (const node_allocator_base<Version, T2, SegmentManager, NodesPerBlock> &other)
       : mp_node_pool(ipcdetail::get_or_create_node_pool<typename node_pool<0>::type>(other.get_segment_manager())) { }
 
    //!Assignment from other node_allocator_base
    node_allocator_base& operator=(const node_allocator_base &other)
    {
       node_allocator_base c(other);
       boost::adl_move_swap(*this, c);
       return *this;
    }
 
    //!Destructor, removes node_pool_t from memory
    //!if its reference count reaches to zero. Never throws
    ~node_allocator_base()
    {  ipcdetail::destroy_node_pool_if_last_link(node_pool<0>::get(ipcdetail::to_raw_pointer(mp_node_pool)));   }
 
    //!Returns a pointer to the node pool.
    //!Never throws
    void* get_node_pool() const
    {  return ipcdetail::to_raw_pointer(mp_node_pool);   }
 
    //!Returns the segment manager.
    //!Never throws
    segment_manager* get_segment_manager()const
    {  return node_pool<0>::get(ipcdetail::to_raw_pointer(mp_node_pool))->get_segment_manager();  }
 
    //!Swaps allocators. Does not throw. If each allocator is placed in a
    //!different memory segment, the result is undefined.
    friend void swap(self_t &alloc1, self_t &alloc2)
    {  boost::adl_move_swap(alloc1.mp_node_pool, alloc2.mp_node_pool);  }
 
    #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
    private:
    void_pointer   mp_node_pool;
    #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 };
 
 //!Equality test for same type
 //!of node_allocator_base
 template<unsigned int V, class T, class S, std::size_t NPC> inline
 bool operator==(const node_allocator_base<V, T, S, NPC> &alloc1,
                 const node_allocator_base<V, T, S, NPC> &alloc2)
    {  return alloc1.get_node_pool() == alloc2.get_node_pool(); }
 
 //!Inequality test for same type
 //!of node_allocator_base
 template<unsigned int V, class T, class S, std::size_t NPC> inline
 bool operator!=(const node_allocator_base<V, T, S, NPC> &alloc1,
                 const node_allocator_base<V, T, S, NPC> &alloc2)
    {  return alloc1.get_node_pool() != alloc2.get_node_pool(); }
 
 template < class T
          , class SegmentManager
          , std::size_t NodesPerBlock = 64
          >
 class node_allocator_v1
    :  public node_allocator_base
          < 1
          , T
          , SegmentManager
          , NodesPerBlock
          >
 {
    public:
    typedef ipcdetail::node_allocator_base
          < 1, T, SegmentManager, NodesPerBlock> base_t;
 
    template<class T2>
    struct rebind
    {
       typedef node_allocator_v1<T2, SegmentManager, NodesPerBlock>  other;
    };
 
    node_allocator_v1(SegmentManager *segment_mngr)
       : base_t(segment_mngr)
    {}
 
    template<class T2>
    node_allocator_v1
       (const node_allocator_v1<T2, SegmentManager, NodesPerBlock> &other)
       : base_t(other)
    {}
 };
 
 }  //namespace ipcdetail{
 
 #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 
 //!An STL node allocator that uses a segment manager as memory
 //!source. The internal pointer type will of the same type (raw, smart) as
 //!"typename SegmentManager::void_pointer" type. This allows
 //!placing the allocator in shared memory, memory mapped-files, etc...
 //!This node allocator shares a segregated storage between all instances
 //!of node_allocator with equal sizeof(T) placed in the same segment
 //!group. NodesPerBlock is the number of nodes allocated at once when the allocator
 //!runs out of nodes
 template < class T
          , class SegmentManager
          , std::size_t NodesPerBlock
          >
 class node_allocator
    #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
    :  public ipcdetail::node_allocator_base
          < 2
          , T
          , SegmentManager
          , NodesPerBlock
          >
    #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 {
 
    #ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
    typedef ipcdetail::node_allocator_base
          < 2, T, SegmentManager, NodesPerBlock> base_t;
    public:
    typedef boost::interprocess::version_type<node_allocator, 2>   version;
 
    template<class T2>
    struct rebind
    {
       typedef node_allocator<T2, SegmentManager, NodesPerBlock>  other;
    };
 
    node_allocator(SegmentManager *segment_mngr)
       : base_t(segment_mngr)
    {}
 
    template<class T2>
    node_allocator
       (const node_allocator<T2, SegmentManager, NodesPerBlock> &other)
       : base_t(other)
    {}
 
    #else //BOOST_INTERPROCESS_DOXYGEN_INVOKED
    public:
    typedef implementation_defined::segment_manager       segment_manager;
    typedef segment_manager::void_pointer                 void_pointer;
    typedef implementation_defined::pointer               pointer;
    typedef implementation_defined::const_pointer         const_pointer;
    typedef T                                             value_type;
    typedef typename ipcdetail::add_reference
                      <value_type>::type                  reference;
    typedef typename ipcdetail::add_reference
                      <const value_type>::type            const_reference;
    typedef typename segment_manager::size_type           size_type;
    typedef typename segment_manager::difference_type     difference_type;
 
    //!Obtains node_allocator from
    //!node_allocator
    template<class T2>
    struct rebind
    {
       typedef node_allocator<T2, SegmentManager, NodesPerBlock> other;
    };
 
    private:
    //!Not assignable from
    //!related node_allocator
    template<class T2, class SegmentManager2, std::size_t N2>
    node_allocator& operator=
       (const node_allocator<T2, SegmentManager2, N2>&);
 
    //!Not assignable from
    //!other node_allocator
    //node_allocator& operator=(const node_allocator&);
 
    public:
    //!Constructor from a segment manager. If not present, constructs a node
    //!pool. Increments the reference count of the associated node pool.
    //!Can throw boost::interprocess::bad_alloc
    node_allocator(segment_manager *segment_mngr);
 
    //!Copy constructor from other node_allocator. Increments the reference
    //!count of the associated node pool. Never throws
    node_allocator(const node_allocator &other);
 
    //!Copy constructor from related node_allocator. If not present, constructs
    //!a node pool. Increments the reference count of the associated node pool.
    //!Can throw boost::interprocess::bad_alloc
    template<class T2>
    node_allocator
       (const node_allocator<T2, SegmentManager, NodesPerBlock> &other);
 
    //!Destructor, removes node_pool_t from memory
    //!if its reference count reaches to zero. Never throws
    ~node_allocator();
 
    //!Returns a pointer to the node pool.
    //!Never throws
    void* get_node_pool() const;
 
    //!Returns the segment manager.
    //!Never throws
    segment_manager* get_segment_manager()const;
 
    //!Returns the number of elements that could be allocated.
    //!Never throws
    size_type max_size() const;
 
    //!Allocate memory for an array of count elements.
    //!Throws boost::interprocess::bad_alloc if there is no enough memory
    pointer allocate(size_type count, cvoid_pointer hint = 0);
 
    //!Deallocate allocated memory.
    //!Never throws
    void deallocate(const pointer &ptr, size_type count);
 
    //!Deallocates all free blocks
    //!of the pool
    void deallocate_free_blocks();
 
    //!Swaps allocators. Does not throw. If each allocator is placed in a
    //!different memory segment, the result is undefined.
    friend void swap(self_t &alloc1, self_t &alloc2);
 
    //!Returns address of mutable object.
    //!Never throws
    pointer address(reference value) const;
 
    //!Returns address of non mutable object.
    //!Never throws
    const_pointer address(const_reference value) const;
 
    //!Copy construct an object.
    //!Throws if T's copy constructor throws
    void construct(const pointer &ptr, const_reference v);
 
    //!Destroys object. Throws if object's
    //!destructor throws
    void destroy(const pointer &ptr);
 
    //!Returns maximum the number of objects the previously allocated memory
    //!pointed by p can hold. This size only works for memory allocated with
    //!allocate, allocation_command and allocate_many.
    size_type size(const pointer &p) const;
 
    pointer allocation_command(boost::interprocess::allocation_type command,
                          size_type limit_size, size_type &prefer_in_recvd_out_size, pointer &reuse);
 
    //!Allocates many elements of size elem_size in a contiguous block
    //!of memory. The minimum number to be allocated is min_elements,
    //!the preferred and maximum number is
    //!preferred_elements. The number of actually allocated elements is
    //!will be assigned to received_size. The elements must be deallocated
    //!with deallocate(...)
    void allocate_many(size_type elem_size, size_type num_elements, multiallocation_chain &chain);
 
    //!Allocates n_elements elements, each one of size elem_sizes[i]in a
    //!contiguous block
    //!of memory. The elements must be deallocated
    void allocate_many(const size_type *elem_sizes, size_type n_elements, multiallocation_chain &chain);
 
    //!Allocates many elements of size elem_size in a contiguous block
    //!of memory. The minimum number to be allocated is min_elements,
    //!the preferred and maximum number is
    //!preferred_elements. The number of actually allocated elements is
    //!will be assigned to received_size. The elements must be deallocated
    //!with deallocate(...)
    void deallocate_many(multiallocation_chain &chain);
 
    //!Allocates just one object. Memory allocated with this function
    //!must be deallocated only with deallocate_one().
    //!Throws boost::interprocess::bad_alloc if there is no enough memory
    pointer allocate_one();
 
    //!Allocates many elements of size == 1 in a contiguous block
    //!of memory. The minimum number to be allocated is min_elements,
    //!the preferred and maximum number is
    //!preferred_elements. The number of actually allocated elements is
    //!will be assigned to received_size. Memory allocated with this function
    //!must be deallocated only with deallocate_one().
    void allocate_individual(size_type num_elements, multiallocation_chain &chain);
 
    //!Deallocates memory previously allocated with allocate_one().
    //!You should never use deallocate_one to deallocate memory allocated
    //!with other functions different from allocate_one(). Never throws
    void deallocate_one(const pointer &p);
 
    //!Allocates many elements of size == 1 in a contiguous block
    //!of memory. The minimum number to be allocated is min_elements,
    //!the preferred and maximum number is
    //!preferred_elements. The number of actually allocated elements is
    //!will be assigned to received_size. Memory allocated with this function
    //!must be deallocated only with deallocate_one().
    void deallocate_individual(multiallocation_chain &chain);
    #endif
 };
 
 #ifdef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 
 //!Equality test for same type
 //!of node_allocator
 template<class T, class S, std::size_t NPC> inline
 bool operator==(const node_allocator<T, S, NPC> &alloc1,
                 const node_allocator<T, S, NPC> &alloc2);
 
 //!Inequality test for same type
 //!of node_allocator
 template<class T, class S, std::size_t NPC> inline
 bool operator!=(const node_allocator<T, S, NPC> &alloc1,
                 const node_allocator<T, S, NPC> &alloc2);
 
 #endif
 
 }  //namespace interprocess {
 }  //namespace boost {
 
 #include <boost/interprocess/detail/config_end.hpp>
 
 #endif   //#ifndef BOOST_INTERPROCESS_NODE_ALLOCATOR_HPP

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