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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Obstack.h
//
// = AUTHOR
// Doug Schmidt
//
// ============================================================================
#if !defined (ACE_OBSTACK_H)
#define ACE_OBSTACK_H
#include "ace/Malloc.h"
class ACE_Export ACE_Obchunk
{
// = TITLE
// Defines the state that represents a "chunk" of memory.
public:
friend class ACE_Obstack;
ACE_Obchunk (size_t size);
// Constructor.
void dump (void) const;
// Dump the state of an object.
ACE_ALLOC_HOOK_DECLARE;
// Declare the dynamic allocation hooks.
private:
char *end_;
// Pointer to the end of the chunk.
char *cur_;
// Pointer to the current location in the chunk.
ACE_Obchunk *next_;
// Next chunk in the chain.
char contents_[4];
// Pointer to the beginning contents of this chunk. This field is
// actually overlayed by the memory allocated by
// <ACE_Obstack::new_chunk>. Therefore, it *must* come last.
};
class ACE_Export ACE_Obstack
{
// = TITLE
// Define a simple "mark and release" memory allocation utility.
//
// = DESCRIPTION
// The implementation is similar to the GNU obstack utility,
// which is used extensively in the GCC compiler.
public:
// = Initialization and termination methods.
ACE_Obstack (size_t size = 4096 - sizeof (ACE_Obchunk),
ACE_Allocator *allocator_strategy = 0);
~ACE_Obstack (void);
char *copy (const char *data,
size_t len);
// Copy the data into the current Obchunk.
void release (void);
// "Release" the entire stack of Obchunks, putting it back on the
// free list.
void dump (void) const;
// Dump the state of an object.
ACE_ALLOC_HOOK_DECLARE;
// Declare the dynamic allocation hooks.
protected:
class ACE_Obchunk *new_chunk (void);
ACE_Allocator *allocator_strategy_;
// Pointer to the allocator used by this Obstack.
size_t size_;
// Current size of the Obstack;
// = Don't change the order of the following two fields.
class ACE_Obchunk *head_;
// Head of the Obchunk chain.
class ACE_Obchunk *curr_;
// Pointer to the current Obchunk.
};
#endif /* ACE_OBSTACK_H */
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