mstl_hash_table_base.hpp

一个类STL的多平台可移植的算法容器库,主要用于嵌入式系统编程时的内存管理等方面

/*
The young Library
Copyright (c) 2005 by 杨桓

Permission to use, copy, modify, distribute and sell this software for any
purpose is hereby granted without fee, provided that the above copyright
notice appear in all copies and that both that copyright notice and this
permission notice appear in supporting documentation.
The author make no representations about the suitability of this software
for any purpose. It is provided "as is" without express or implied warranty.
*/

/*
 * This file is derived from software bearing the following
 * restrictions:
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this
 * software and its documentation for any purpose is hereby
 * granted without fee, provided that the above copyright notice
 * appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation.
 * Hewlett-Packard Company makes no representations about the
 * suitability of this software for any purpose. It is provided
 * "as is" without express or implied warranty.
 */

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
#ifndef __MACRO_CPLUSPLUS_MINI_STL_HASH_TABLE_BASE_HEADER_FILE__
#define __MACRO_CPLUSPLUS_MINI_STL_HASH_TABLE_BASE_HEADER_FILE__
//-----------------------------------------------------------------------------
#include "../algorithm/mstl_algorithm_lower_bound.hpp"
//-----------------------------------------------------------------------------
__MACRO_CPLUSPLUS_MINI_STL_BEGIN_NAMESPACE__
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------

static const int hash_table_num_primes = 28;

static const unsigned long  hash_table_prime_list[ hash_table_num_primes ] =
{
    53,         97,           193,         389,       769,
    1543,       3079,         6151,        12289,     24593,
    49157,      98317,        196613,      393241,    786433,
    1572869,    3145739,      6291469,     12582917,  25165843,
    50331653,   100663319,    201326611,   402653189, 805306457,
    1610612741, 3221225473ul, 4294967291ul
};

inline unsigned long hash_table_next_prime( unsigned long n )
{
    const unsigned long* first = hash_table_prime_list;
    const unsigned long* last = hash_table_prime_list + hash_table_num_primes;
    const unsigned long* pos = lower_bound( first, last, n );
    return ( pos == last ? *(last - 1) : *pos );
}

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
__MACRO_CPLUSPLUS_MINI_STL_END_NAMESPACE__
#endif
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------