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Diffstat (limited to 'boost/container/allocator.hpp')
| -rw-r--r-- | boost/container/allocator.hpp | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/boost/container/allocator.hpp b/boost/container/allocator.hpp new file mode 100644 index 0000000000..14d56452b6 --- /dev/null +++ b/boost/container/allocator.hpp @@ -0,0 +1,367 @@ +////////////////////////////////////////////////////////////////////////////// +// +// (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 + +#if defined(_MSC_VER) && (_MSC_VER >= 1200) +# 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> +#include <new> + +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_CONTAINER_NOEXCEPT + {} + + //!Constructor from other allocator. + //!Never throws + allocator(const allocator &) BOOST_CONTAINER_NOEXCEPT + {} + + //!Constructor from related allocator. + //!Never throws + template<class T2> + allocator(const allocator<T2 + #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED + , Version, AllocationDisableMask + #endif + > &) BOOST_CONTAINER_NOEXCEPT + {} + + //!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_CONTAINER_NOEXCEPT + { boost_cont_free(ptr); } + + //!Returns the maximum number of elements that could be allocated. + //!Never throws + size_type max_size() const BOOST_CONTAINER_NOEXCEPT + { return size_type(-1)/sizeof(T); } + + //!Swaps two allocators, does nothing + //!because this allocator is stateless + friend void swap(self_t &, self_t &) BOOST_CONTAINER_NOEXCEPT + {} + + //!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_CONTAINER_NOEXCEPT + { 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_CONTAINER_NOEXCEPT + { 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 + std::pair<pointer, bool> + allocation_command(allocation_type command, + size_type limit_size, + size_type preferred_size, + size_type &received_size, pointer reuse = pointer()) + { + BOOST_STATIC_ASSERT(( Version > 1 )); + const allocation_type mask(AllocationDisableMask); + command &= ~mask; + std::pair<pointer, bool> ret = + priv_allocation_command(command, limit_size, preferred_size, received_size, reuse); + if(!ret.first && !(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_CONTAINER_NOEXCEPT + { + 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_CONTAINER_NOEXCEPT + { + 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_CONTAINER_NOEXCEPT + { + 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_CONTAINER_NOEXCEPT + { + 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: + + std::pair<pointer, bool> priv_allocation_command + (allocation_type command, std::size_t limit_size + ,std::size_t preferred_size,std::size_t &received_size, void *reuse_ptr) + { + boost_cont_command_ret_t ret = {0 , 0}; + if((limit_size > this->max_size()) | (preferred_size > this->max_size())){ + return std::pair<pointer, bool>(pointer(), false); + } + std::size_t l_size = limit_size*sizeof(T); + std::size_t p_size = preferred_size*sizeof(T); + std::size_t r_size; + { + ret = boost_cont_allocation_command(command, sizeof(T), l_size, p_size, &r_size, reuse_ptr); + } + received_size = r_size/sizeof(T); + return std::pair<pointer, bool>(static_cast<pointer>(ret.first), !!ret.second); + } +}; + +} //namespace container { +} //namespace boost { + +#include <boost/container/detail/config_end.hpp> + +#endif //BOOST_CONTAINER_ALLOCATOR_HPP + |