comparison DEPENDENCIES/generic/include/boost/container/allocator.hpp @ 102:f46d142149f5

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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/alloc_lib_auto_link.hpp>
+#include <boost/container/detail/multiallocation_chain.hpp>
+#include <boost/static_assert.hpp>
+#include <cstddef>
+#include <cassert>
+
+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::container_detail::
+      version_type<self_t, Version>             version;
+
+   #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
+   typedef boost::container::container_detail::
+         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
+
+//!\file
+//! 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.
+#ifdef BOOST_CONTAINER_DOXYGEN_INVOKED
+template<class T>
+#else
+//! 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, unsigned int AllocationDisableMask>
+#endif   //#ifdef BOOST_CONTAINER_DOXYGEN_INVOKED
+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>&);
+
+   //Not assignable from other allocator
+   allocator& operator=(const allocator&);
+
+   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::container_detail::
+      version_type<self_t, Version>                version;
+
+   #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
+   typedef boost::container::container_detail::
+         basic_multiallocation_chain<void*>        void_multiallocation_chain;
+
+   typedef boost::container::container_detail::
+      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 = boost_cont_malloc(count*sizeof(T));
+      if(!ret)
+         boost::container::throw_bad_alloc();
+      return static_cast<pointer>(ret);
+   }
+
+   //!Deallocates previously allocated memory.
+   //!Never throws
+   void deallocate(pointer ptr, size_type) BOOST_NOEXCEPT_OR_NOTHROW
+   {  boost_cont_free(ptr);  }
+
+   //!Returns the maximum number of elements that could be allocated.
+   //!Never throws
+   size_type max_size() const BOOST_NOEXCEPT_OR_NOTHROW
+   {  return size_type(-1)/sizeof(T);   }
+
+   //!Swaps two allocators, does nothing
+   //!because this allocator is stateless
+   friend void swap(self_t &, self_t &) BOOST_NOEXCEPT_OR_NOTHROW
+   {}
+
+   //!An allocator always compares to true, as memory allocated with one
+   //!instance can be deallocated by another instance
+   friend bool operator==(const allocator &, const allocator &) BOOST_NOEXCEPT_OR_NOTHROW
+   {  return true;   }
+
+   //!An allocator always compares to false, as memory allocated with one
+   //!instance can be deallocated by another instance
+   friend bool operator!=(const allocator &, const allocator &) BOOST_NOEXCEPT_OR_NOTHROW
+   {  return false;   }
+
+   //!An advanced function that offers in-place expansion shrink to fit and new allocation
+   //!capabilities. Memory allocated with this function can only be deallocated with deallocate()
+   //!or deallocate_many().
+   //!This function is available only with Version == 2
+   pointer allocation_command(allocation_type command,
+                         size_type limit_size,
+                         size_type &prefer_in_recvd_out_size,
+                         pointer &reuse)
+   {
+      BOOST_STATIC_ASSERT(( Version > 1 ));
+      const allocation_type mask(AllocationDisableMask);
+      command &= ~mask;
+      pointer ret = this->priv_allocation_command(command, limit_size, prefer_in_recvd_out_size, reuse);
+      if(!ret && !(command & BOOST_CONTAINER_NOTHROW_ALLOCATION))
+         boost::container::throw_bad_alloc();
+      return ret;
+   }
+
+   //!Returns maximum the number of objects the previously allocated memory
+   //!pointed by p can hold.
+   //!Memory must not have been allocated with
+   //!allocate_one or allocate_individual.
+   //!This function is available only with Version == 2
+   size_type size(pointer p) const BOOST_NOEXCEPT_OR_NOTHROW
+   {
+      BOOST_STATIC_ASSERT(( Version > 1 ));
+      return boost_cont_size(p);
+   }
+
+   //!Allocates just one object. Memory allocated with this function
+   //!must be deallocated only with deallocate_one().
+   //!Throws bad_alloc if there is no enough memory
+   //!This function is available only with Version == 2
+   pointer allocate_one()
+   {
+      BOOST_STATIC_ASSERT(( Version > 1 ));
+      return this->allocate(1);
+   }
+
+   //!Allocates many elements of size == 1.
+   //!Elements must be individually deallocated with deallocate_one()
+   //!This function is available only with Version == 2
+   void allocate_individual(std::size_t num_elements, multiallocation_chain &chain)
+   {
+      BOOST_STATIC_ASSERT(( Version > 1 ));
+      this->allocate_many(1, num_elements, 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() or allocate_individual.
+   //Never throws
+   void deallocate_one(pointer p) BOOST_NOEXCEPT_OR_NOTHROW
+   {
+      BOOST_STATIC_ASSERT(( Version > 1 ));
+      return this->deallocate(p, 1);
+   }
+
+   //!Deallocates memory allocated with allocate_one() or allocate_individual().
+   //!This function is available only with Version == 2
+   void deallocate_individual(multiallocation_chain &chain) BOOST_NOEXCEPT_OR_NOTHROW
+   {
+      BOOST_STATIC_ASSERT(( Version > 1 ));
+      return this->deallocate_many(chain);
+   }
+
+   //!Allocates many elements of size elem_size.
+   //!Elements must be individually deallocated with deallocate()
+   //!This function is available only with Version == 2
+   void allocate_many(size_type elem_size, std::size_t n_elements, multiallocation_chain &chain)
+   {
+      BOOST_STATIC_ASSERT(( Version > 1 ));/*
+      boost_cont_memchain ch;
+      BOOST_CONTAINER_MEMCHAIN_INIT(&ch);
+      if(!boost_cont_multialloc_nodes(n_elements, elem_size*sizeof(T), DL_MULTIALLOC_DEFAULT_CONTIGUOUS, &ch)){
+         boost::container::throw_bad_alloc();
+      }
+      chain.incorporate_after(chain.before_begin()
+                             ,(T*)BOOST_CONTAINER_MEMCHAIN_FIRSTMEM(&ch)
+                             ,(T*)BOOST_CONTAINER_MEMCHAIN_LASTMEM(&ch)
+                             ,BOOST_CONTAINER_MEMCHAIN_SIZE(&ch) );*/
+      if(!boost_cont_multialloc_nodes(n_elements, elem_size*sizeof(T), DL_MULTIALLOC_DEFAULT_CONTIGUOUS, reinterpret_cast<boost_cont_memchain *>(&chain))){
+         boost::container::throw_bad_alloc();
+      }
+   }
+
+   //!Allocates n_elements elements, each one of size elem_sizes[i]
+   //!Elements must be individually deallocated with deallocate()
+   //!This function is available only with Version == 2
+   void allocate_many(const size_type *elem_sizes, size_type n_elements, multiallocation_chain &chain)
+   {
+      BOOST_STATIC_ASSERT(( Version > 1 ));
+      boost_cont_memchain ch;
+      BOOST_CONTAINER_MEMCHAIN_INIT(&ch);
+      if(!boost_cont_multialloc_arrays(n_elements, elem_sizes, sizeof(T), DL_MULTIALLOC_DEFAULT_CONTIGUOUS, &ch)){
+         boost::container::throw_bad_alloc();
+      }
+      chain.incorporate_after(chain.before_begin()
+                             ,(T*)BOOST_CONTAINER_MEMCHAIN_FIRSTMEM(&ch)
+                             ,(T*)BOOST_CONTAINER_MEMCHAIN_LASTMEM(&ch)
+                             ,BOOST_CONTAINER_MEMCHAIN_SIZE(&ch) );
+      /*
+      if(!boost_cont_multialloc_arrays(n_elements, elem_sizes, sizeof(T), DL_MULTIALLOC_DEFAULT_CONTIGUOUS, reinterpret_cast<boost_cont_memchain *>(&chain))){
+         boost::container::throw_bad_alloc();
+      }*/
+   }
+
+   //!Deallocates several elements allocated by
+   //!allocate_many(), allocate(), or allocation_command().
+   //!This function is available only with Version == 2
+   void deallocate_many(multiallocation_chain &chain) BOOST_NOEXCEPT_OR_NOTHROW
+   {
+      BOOST_STATIC_ASSERT(( Version > 1 ));
+      boost_cont_memchain ch;
+      void *beg(&*chain.begin()), *last(&*chain.last());
+      size_t size(chain.size());
+      BOOST_CONTAINER_MEMCHAIN_INIT_FROM(&ch, beg, last, size);
+      boost_cont_multidealloc(&ch);
+      //boost_cont_multidealloc(reinterpret_cast<boost_cont_memchain *>(&chain));
+   }
+
+   private:
+
+   pointer priv_allocation_command
+      (allocation_type command,    std::size_t limit_size
+      ,size_type &prefer_in_recvd_out_size
+      ,pointer &reuse_ptr)
+   {
+      std::size_t const preferred_size = prefer_in_recvd_out_size;
+      boost_cont_command_ret_t ret = {0 , 0};
+      if((limit_size > this->max_size()) | (preferred_size > this->max_size())){
+         return pointer();
+      }
+      std::size_t l_size = limit_size*sizeof(T);
+      std::size_t p_size = preferred_size*sizeof(T);
+      std::size_t r_size;
+      {
+         void* reuse_ptr_void = reuse_ptr;
+         ret = boost_cont_allocation_command(command, sizeof(T), l_size, p_size, &r_size, reuse_ptr_void);
+         reuse_ptr = ret.second ? static_cast<T*>(reuse_ptr_void) : 0;
+      }
+      prefer_in_recvd_out_size = r_size/sizeof(T);
+      return (pointer)ret.first;
+   }
+};
+
+}  //namespace container {
+}  //namespace boost {
+
+#include <boost/container/detail/config_end.hpp>
+
+#endif   //BOOST_CONTAINER_ALLOCATOR_HPP
+