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xi_defs.h
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C/C++ Source or Header
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1997-02-17
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// This may look like C code, but it is really -*- C++ -*-
/*
Copyright (C) 1988 Free Software Foundation
written by Doug Lea (dl@rocky.oswego.edu)
This file is part of the GNU C++ Library. This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version. This library 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _XItemdefs_h
#define _XItemdefs_h 1
#define XItemEQ(a,b) ((a).title == (b).title)
// equality operator
#ifndef XItemEQ
#define XItemEQ(a, b) ((a) == (b))
#endif
// less-than-or-equal
#ifndef XItemLE
#define XItemLE(a, b) ((a) <= (b))
#endif
// comparison : less-than -> < 0; equal -> 0; greater-than -> > 0
#ifndef XItemCMP
#define XItemCMP(a, b) ( ((a) <= (b))? (((a) == (b))? 0 : -1) : 1 )
#endif
// hash function
#ifndef XItemHASH
extern unsigned int hash(XItem&);
#define XItemHASH(x) hash(x)
#endif
// initial capacity for structures requiring one
#ifndef DEFAULT_INITIAL_CAPACITY
#define DEFAULT_INITIAL_CAPACITY 100
#endif
// HASHTABLE_TOO_CROWDED(COUNT, SIZE) is true iff a hash table with COUNT
// elements and SIZE slots is too full, and should be resized.
// This is so if available space is less than 1/8.
#define HASHTABLE_TOO_CROWDED(COUNT, SIZE) ((SIZE) - ((SIZE) >> 3) <= (COUNT))
#endif