Subject: [Boost-commit] svn:boost r52534 - sandbox/memory/boost/memory
From: xushiweizh_at_[hidden]
Date: 2009-04-22 02:39:38
Author: xushiwei
Date: 2009-04-22 02:39:36 EDT (Wed, 22 Apr 2009)
New Revision: 52534
URL: http://svn.boost.org/trac/boost/changeset/52534
Log:
fixed_alloc start
Added:
sandbox/memory/boost/memory/fixed_alloc.hpp (contents, props changed)
Text files modified:
sandbox/memory/boost/memory/region_alloc.hpp | 6 +-----
1 files changed, 1 insertions(+), 5 deletions(-)
Added: sandbox/memory/boost/memory/fixed_alloc.hpp
==============================================================================
--- (empty file)
+++ sandbox/memory/boost/memory/fixed_alloc.hpp 2009-04-22 02:39:36 EDT (Wed, 22 Apr 2009)
@@ -0,0 +1,100 @@
+//
+// boost/memory/fixed_alloc.hpp
+//
+// Copyright (c) 2004 - 2008 xushiwei (xushiweizh_at_[hidden])
+//
+// 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/memory/index.htm for documentation.
+//
+#ifndef BOOST_MEMORY_FIXED_ALLOC_HPP
+#define BOOST_MEMORY_FIXED_ALLOC_HPP
+
+#ifndef BOOST_MEMORY_BASIC_HPP
+#include "basic.hpp"
+#endif
+
+NS_BOOST_MEMORY_BEGIN
+
+// -------------------------------------------------------------------------
+// class fixed_alloc
+
+template <class PolicyT>
+class fixed_alloc
+{
+private:
+ typedef typename PolicyT::alloc_type AllocT;
+
+public:
+ enum { MemBlockSize = PolicyT::MemBlockBytes - AllocT::Padding };
+
+ typedef AllocT alloc_type;
+ typedef size_t size_type;
+
+#pragma pack(1)
+private:
+ struct MemBlock;
+ struct Header
+ {
+ Header* pPrev;
+ Header* pNext;
+ size_t nUsed;
+ }
+
+ enum { HeaderSize = sizeof(Header) };
+ enum { BlockSize = MemBlockSize - HeaderSize };
+
+ struct MemBlock : Header
+ {
+ char buffer[BlockSize];
+ };
+
+ enum { ChunkHeaderSize = sizeof(void*) };
+ struct Chunk
+ {
+ MemBlock* pBlock;
+ char data[1];
+ };
+#pragma pack()
+
+ AllocT m_alloc;
+ Header m_blks;
+ const size_type m_cbChunk;
+ const size_type m_nMaxPerBlock;
+
+private:
+ void init_()
+ {
+ BOOST_MEMORY_ASSERT(m_nMaxPerBlock > 0);
+
+ m_blks.pPrev = m_blks.pNext = &m_blks;
+ }
+
+public:
+ explicit fixed_alloc(size_type cbElem)
+ : m_cbChunk(cbElem + ChunkHeaderSize), m_nMaxPerBlock(BlockSize / m_cbChunk)
+ {
+ init_();
+ }
+
+ fixed_alloc(AllocT alloc, size_type cbElem)
+ : : m_alloc(alloc), m_cbChunk(cbElem + ChunkHeaderSize), m_nMaxPerBlock(BlockSize / m_cbChunk)
+ {
+ init_();
+ }
+
+ region_alloc(fixed_alloc& owner)
+ : m_alloc(owner.m_alloc), m_cbChunk(cbElem + ChunkHeaderSize), m_nMaxPerBlock(BlockSize / m_cbChunk)
+ {
+ init_();
+ }
+};
+
+// -------------------------------------------------------------------------
+// $Log: $
+
+NS_BOOST_MEMORY_END
+
+#endif /* BOOST_MEMORY_FIXED_ALLOC_HPP */
Modified: sandbox/memory/boost/memory/region_alloc.hpp
==============================================================================
--- sandbox/memory/boost/memory/region_alloc.hpp (original)
+++ sandbox/memory/boost/memory/region_alloc.hpp 2009-04-22 02:39:36 EDT (Wed, 22 Apr 2009)
@@ -36,15 +36,11 @@
typedef AllocT alloc_type;
+#pragma pack(1)
private:
enum { HeaderSize = sizeof(void*) };
enum { BlockSize = MemBlockSize - HeaderSize };
-#pragma pack(1)
-private:
- struct MemBlock;
- friend struct MemBlock;
-
struct MemBlock
{
MemBlock* pPrev;