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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2007-2013. 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_ALLOCATOR_HPP
#define BOOST_CONTAINER_ALLOCATOR_HPP

#ifndef BOOST_CONFIG_HPP
#  include <boost/config.hpp>
#endif

#if defined(BOOST_HAS_PRAGMA_ONCE)
#  pragma once
#endif

#include <boost/container/detail/config_begin.hpp>
#include <boost/container/detail/workaround.hpp>
#include <boost/container/container_fwd.hpp>
#include <boost/container/detail/version_type.hpp>
#include <boost/container/throw_exception.hpp>
#include <boost/container/detail/dlmalloc.hpp>
#include <boost/container/detail/multiallocation_chain.hpp>
#include <boost/static_assert.hpp>
#include <cstddef>
#include <cassert>

//!\file

namespace boost {
namespace container {

#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED

template<unsigned Version, unsigned int AllocationDisableMask>
class allocator<void, Version, AllocationDisableMask>
{
   typedef allocator<void, Version, AllocationDisableMask>   self_t;
   public:
   typedef void                                 value_type;
   typedef void *                               pointer;
   typedef const void*                          const_pointer;
   typedef int &                                reference;
   typedef const int &                          const_reference;
   typedef std::size_t                          size_type;
   typedef std::ptrdiff_t                       difference_type;
   typedef boost::container::dtl::
      version_type<self_t, Version>             version;

   #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
   typedef boost::container::dtl::
         basic_multiallocation_chain<void*>        multiallocation_chain;
   #endif   //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED

   //!Obtains an allocator that allocates
   //!objects of type T2
   template<class T2>
   struct rebind
   {
      typedef allocator< T2
                       #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
                       , Version, AllocationDisableMask
                       #endif
                       > other;
   };

   //!Default constructor
   //!Never throws
   allocator()
   {}

   //!Constructor from other allocator.
   //!Never throws
   allocator(const allocator &)
   {}

   //!Constructor from related allocator.
   //!Never throws
   template<class T2>
      allocator(const allocator<T2, Version, AllocationDisableMask> &)
   {}
};

#endif   //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED

//! This class is an extended STL-compatible that offers advanced allocation mechanism
//!(in-place expansion, shrinking, burst-allocation...)
//!
//! This allocator is a wrapper around a modified DLmalloc.
//! If Version is 1, the allocator is a STL conforming allocator. If Version is 2,
//! the allocator offers advanced expand in place and burst allocation capabilities.
//!
//! AllocationDisableMask works only if Version is 2 and it can be an inclusive OR
//! of allocation types the user wants to disable.
template< class T
        , unsigned Version BOOST_CONTAINER_DOCONLY(=2)
        , unsigned int AllocationDisableMask BOOST_CONTAINER_DOCONLY(=0)>
class allocator
{
   typedef unsigned int allocation_type;
   #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
   private:

   //Self type
   typedef allocator<T, Version, AllocationDisableMask>   self_t;

   //Not assignable from related allocator
   template<class T2, unsigned int Version2, unsigned int AllocationDisableMask2>
   allocator& operator=(const allocator<T2, Version2, AllocationDisableMask2>&);

   static const unsigned int ForbiddenMask =
      BOOST_CONTAINER_ALLOCATE_NEW | BOOST_CONTAINER_EXPAND_BWD | BOOST_CONTAINER_EXPAND_FWD ;

   //The mask can't disable all the allocation types
   BOOST_STATIC_ASSERT((  (AllocationDisableMask & ForbiddenMask) != ForbiddenMask  ));

   //The mask is only valid for version 2 allocators
   BOOST_STATIC_ASSERT((  Version != 1 || (AllocationDisableMask == 0)  ));

   #endif   //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED

   public:
   typedef T                                    value_type;
   typedef T *                                  pointer;
   typedef const T *                            const_pointer;
   typedef T &                                  reference;
   typedef const T &                            const_reference;
   typedef std::size_t                          size_type;
   typedef std::ptrdiff_t                       difference_type;

   typedef boost::container::dtl::
      version_type<self_t, Version>                version;

   #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
   typedef boost::container::dtl::
         basic_multiallocation_chain<void*>        void_multiallocation_chain;

   typedef boost::container::dtl::
      transform_multiallocation_chain
         <void_multiallocation_chain, T>           multiallocation_chain;
   #endif   //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED

   //!Obtains an allocator that allocates
   //!objects of type T2
   template<class T2>
   struct rebind
   {
      typedef allocator<T2, Version, AllocationDisableMask> other;
   };

   //!Default constructor
   //!Never throws
   allocator() BOOST_NOEXCEPT_OR_NOTHROW
   {}

   //!Constructor from other allocator.
   //!Never throws
   allocator(const allocator &) BOOST_NOEXCEPT_OR_NOTHROW
   {}

   //!Constructor from related allocator.
   //!Never throws
   template<class T2>
   allocator(const allocator<T2
            #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
            , Version, AllocationDisableMask
            #endif
            > &) BOOST_NOEXCEPT_OR_NOTHROW
   {}

   //!Allocates memory for an array of count elements.
   //!Throws std::bad_alloc if there is no enough memory
   //!If Version is 2, this allocated memory can only be deallocated
   //!with deallocate() or (for Version == 2) deallocate_many()
   pointer allocate(size_type count, const void * hint= 0)
   {
      (void)hint;
      if(count > this->max_size())
         boost::container::throw_bad_alloc();
      void *ret = dlmalloc_malloc(count*sizeof(T));
      if(!ret)
         boost::container::throw_bad_alloc();