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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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mfc
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src
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fixalloc.h
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C/C++ Source or Header
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1998-06-16
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2KB
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78 lines
// fixalloc.h - declarations for fixed block allocator
#ifndef __FIXALLOC_H__
#define __FIXALLOC_H__
#include "afxplex_.h"
/////////////////////////////////////////////////////////////////////////////
// CFixedAlloc
class CFixedAlloc
{
// Constructors
public:
CFixedAlloc(UINT nAllocSize, UINT nBlockSize = 64);
// Attributes
UINT GetAllocSize() { return m_nAllocSize; }
// Operations
public:
void* Alloc(); // return a chunk of memory of nAllocSize
void Free(void* p); // free chunk of memory returned from Alloc
void FreeAll(); // free everything allocated from this allocator
// Implementation
public:
~CFixedAlloc();
protected:
struct CNode
{
CNode* pNext; // only valid when in free list
};
UINT m_nAllocSize; // size of each block from Alloc
UINT m_nBlockSize; // number of blocks to get at a time
CPlex* m_pBlocks; // linked list of blocks (is nBlocks*nAllocSize)
CNode* m_pNodeFree; // first free node (NULL if no free nodes)
CRITICAL_SECTION m_protect;
};
#ifndef _DEBUG
// DECLARE_FIXED_ALLOC -- used in class definition
#define DECLARE_FIXED_ALLOC(class_name) \
public: \
void* operator new(size_t size) \
{ \
ASSERT(size == s_alloc.GetAllocSize()); \
UNUSED(size); \
return s_alloc.Alloc(); \
} \
void* operator new(size_t, void* p) \
{ return p; } \
void operator delete(void* p) { s_alloc.Free(p); } \
void* operator new(size_t size, LPCSTR, int) \
{ \
ASSERT(size == s_alloc.GetAllocSize()); \
UNUSED(size); \
return s_alloc.Alloc(); \
} \
protected: \
static CFixedAlloc s_alloc \
// IMPLEMENT_FIXED_ALLOC -- used in class implementation file
#define IMPLEMENT_FIXED_ALLOC(class_name, block_size) \
CFixedAlloc class_name::s_alloc(sizeof(class_name), block_size) \
#else //!_DEBUG
#define DECLARE_FIXED_ALLOC(class_name) // nothing in debug
#define IMPLEMENT_FIXED_ALLOC(class_name, block_size) // nothing in debug
#endif //!_DEBUG
#endif