250 lines
6.3 KiB
C++
250 lines
6.3 KiB
C++
// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
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// Copyright (C) 2010 Winch Gate Property Limited
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#ifndef NL_STL_BLOCK_ALLOCATOR_H
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#define NL_STL_BLOCK_ALLOCATOR_H
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#include "types_nl.h"
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#include "block_memory.h"
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namespace NLMISC {
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// ***************************************************************************
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/**
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* This class is a STL block allocator which use CBlockMemory. see CBlockMemory for description
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* of block memory management/advantages.
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*
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* This class works with STLPort. It implements __stl_alloc_rebind() (not C++ standard??) to work properly
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* with list<>/set<> etc... node allocations.
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*
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* NB: if used with a vector<> or a deque<> (ie if allocate(..,n) is called with n>1), it's still work,
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* but it's use malloc()/free() instead, so it is fully useless in this case :)
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*
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* CSTLBlockAllocator use a pointer on a CBlockMemory, so multiple containers can share the same
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* blockMemory, for maximum space/speed efficiency.
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*
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* Because of CBlockMemory allocation scheme, only same containers of same types can share the
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* same CBlockMemory instance (eg: "list<uint, &myBlockMemory>; vector<uint, &myBlockMemory>;" is invalid and
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* will assert when allocations will occur).
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*
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* To construct a container which use this allocator, do like this:
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* list<uint, CSTLBlockAllocator<uint>> myList( ptrOnBlockMemory );
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*
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* But see CSTLBlockList for easier list instanciation, because using it, you'll do like this:
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* CSTLBlockList<uint> myList(ptrOnBlockMemory);
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*
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* Note: CSTLBlockAllocator take only 4 bytes in memory (a ptr on a CBlockMemory)
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*
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* \author Lionel Berenguier
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* \author Nevrax France
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* \date 2001
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*/
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template<class T>
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class CSTLBlockAllocator : public std::allocator< T >
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{
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public:
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/// Constructor. Must gives a blockMemory to ctor. NB: must gives a CBlockMemory<T, false> !!!
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CSTLBlockAllocator(CBlockMemory<T, false> *bm)
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{
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}
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/// copy ctor
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CSTLBlockAllocator(const CSTLBlockAllocator<T> &other) : std::allocator<T>(other)
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{
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}
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/// dtor
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~CSTLBlockAllocator()
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{
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}
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};
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#if 0
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#if defined(NL_OS_WINDOWS) && !defined(_STLP_MEMBER_TEMPLATE_CLASSES)
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template<class T>
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class CSTLBlockAllocator
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{
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public:
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/// \name standard allocator interface.
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// @{
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typedef T value_type;
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typedef value_type *pointer;
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typedef const T* const_pointer;
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typedef T& reference;
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typedef const T& const_reference;
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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pointer adress(reference x) const
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{
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return &x;
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}
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const_pointer adress(const_reference x) const
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{
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return &x;
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}
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void construct(pointer p, const T &val)
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{
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new (p) T(val);
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}
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void destroy(pointer p)
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{
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p->T::~T();
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}
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// @}
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public:
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/// Constructor. Must gives a blockMemory to ctor. NB: must gives a CBlockMemory<T, false> !!!
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CSTLBlockAllocator(CBlockMemory<T, false> *bm) : _BlockMemory(bm)
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{
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}
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/// copy ctor
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CSTLBlockAllocator(const CSTLBlockAllocator<T> &other) : _BlockMemory(other._BlockMemory)
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{
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// just copy the block memory from the other allocator.
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}
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/// dtor
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~CSTLBlockAllocator()
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{
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_BlockMemory= NULL;
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}
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pointer allocate(size_type n, const_pointer hint= NULL)
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{
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if(n==0)
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return NULL;
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// If sizeof 1, use CBlockMemory allocation
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if(n==1)
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{
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#ifdef NL_DEBUG
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// verify that we allocate with good size!! (verify __stl_alloc_rebind scheme).
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// ie an allocator can be used only to allocate a kind of element
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uint eltSize= std::max(sizeof(T), sizeof(void*));
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nlassert( eltSize == _BlockMemory->__stl_alloc_getEltSize() );
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#endif
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// and allocate.
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return _BlockMemory->allocate();
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}
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// else use std malloc
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else
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return (T*)new uint8[n*sizeof(T)];
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}
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void deallocate(void *p, size_type n)
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{
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if(n==0)
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return;
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// If sizeof 1, use CBlockMemory allocation
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if(n==1)
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_BlockMemory->free((T*)p);
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// else use std free
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else
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delete [] ((uint8*)p);
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}
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template <class _Tp, class U>
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CSTLBlockAllocator<U>& __stl_alloc_rebind(CSTLBlockAllocator<_Tp>& __a, const U*)
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{
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// must change the internal eltSize of __a.
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__a._BlockMemory->__stl_alloc_changeEltSize(sizeof(U));
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// and just typecast/return him
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return (CSTLBlockAllocator<U>&)(__a);
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}
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template <class _Tp, class U>
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CSTLBlockAllocator<U> __stl_alloc_create(const CSTLBlockAllocator<_Tp>&, const U*)
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{
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return CSTLBlockAllocator<U>();
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}
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// *******************
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private:
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// The blockMemory used to allocate elements
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CBlockMemory<T, false> *_BlockMemory;
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};
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#else // NL_OS_WINDOWS
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# if !defined (__STL_USE_SGI_ALLOCATORS)
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template<class T>
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class CSTLBlockAllocator : public std::allocator< T >
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{
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public:
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/// Constructor. Must gives a blockMemory to ctor. NB: must gives a CBlockMemory<T, false> !!!
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CSTLBlockAllocator(CBlockMemory<T, false> *bm)
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{
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}
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/// copy ctor
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CSTLBlockAllocator(const CSTLBlockAllocator<T> &other) : std::allocator<T>(other)
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{
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}
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/// dtor
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~CSTLBlockAllocator()
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{
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}
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};
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# else // !defined (__STL_USE_SGI_ALLOCATORS)
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class CSTLBlockAllocator : public __sgi_alloc
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{
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public:
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/// Constructor. Must gives a blockMemory to ctor. NB: must gives a CBlockMemory<T, false> !!!
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CSTLBlockAllocator(CBlockMemory<T, false> *bm)
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{
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}
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/// copy ctor
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CSTLBlockAllocator(const CSTLBlockAllocator<T> &other) : __sgi_alloc(other)
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{
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}
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/// dtor
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~CSTLBlockAllocator()
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{
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}
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};
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# endif // !defined (__STL_USE_SGI_ALLOCATORS)
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#endif // NL_OS_WINDOWS
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#endif // 0
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} // NLMISC
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#endif // NL_STL_BLOCK_ALLOCATOR_H
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/* End of stl_block_allocator.h */
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