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StringHeap.h
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StringHeap.h
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#ifndef __StringHeap_H
#define __StringHeap_H
/*
* Copyright (c) 2002-2003 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: StringHeap.h,v 1.4 2003/03/01 06:25:30 steve Exp $"
#endif
/*
* The string heap is a way to permanently allocate strings
* efficiently. They only take up the space of the string characters
* and the terminating nul, there is no malloc overhead.
*/
class StringHeap {
public:
StringHeap();
~StringHeap();
const char*add(const char*);
private:
enum { HEAPCELL = 0x10000 };
char*cell_base_;
unsigned cell_ptr_;
unsigned cell_count_;
private: // not implemented
StringHeap(const StringHeap&);
StringHeap& operator= (const StringHeap&);
};
/*
* A lexical string heap is a string heap that makes an effort to
* return the same pointer for identical strings. This saves further
* space by not allocating duplicate strings, so in a system with lots
* of identifiers, this can theoretically save more space.
*/
class StringHeapLex : private StringHeap {
public:
StringHeapLex();
~StringHeapLex();
const char*add(const char*);
unsigned add_count() const;
unsigned add_hit_count() const;
private:
enum { HASH_SIZE = 4096 };
const char*hash_table_[HASH_SIZE];
unsigned add_count_;
unsigned hit_count_;
private: // not implemented
StringHeapLex(const StringHeapLex&);
StringHeapLex& operator= (const StringHeapLex&);
};
/*
* $Log: StringHeap.h,v $
* Revision 1.4 2003/03/01 06:25:30 steve
* Add the lex_strings string handler, and put
* scope names and system task/function names
* into this table. Also, permallocate event
* names from the beginning.
*
* Revision 1.3 2003/01/16 21:44:46 steve
* Keep some debugging status.
*
* Revision 1.2 2002/08/12 01:34:58 steve
* conditional ident string using autoconfig.
*
* Revision 1.1 2002/08/04 19:13:16 steve
* dll uses StringHeap for named items.
*
*/
#endif