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Я пытаюсь узнать, как использовать библиотеку gperf для идеального хэширования на компьютере Ubuntu 14.04. Я получаю ошибки компилятора. Может кто-то помочь мне с этим?Почему я получаю неопределенную ссылку в этом коде на C++?
Gperf является библиотекой, которая при условии, с набором статических ключей хэша , как, например, слова в английском словаре будет производить C или C++ кода, содержащего идеальную хеш-функцию и сам хэш-таблицу.
Вот код. Полученные функции: in_word_set, который является функцией I, пользователь будет использовать для запроса хеш-таблицы и функции hash, используемой in_word_set для сопоставления ключевого слова в хеш-таблице.
Ключами, которые я использовал для создания хеш-таблицы, были первые 10 слов словаря SOWPODS scrabble, которые вы можете увидеть в приведенном ниже списке.
Ошибка, возникающая при компиляции с g ++.
[~/Desktop]$ g++ -g -Wall fun.cpp -lm /tmp/ccUb0GiA.o: In function `main': /home/gaurish108/Desktop/fun.cpp:149: undefined reference to `in_word_set(char const*, unsigned int)' collect2: error: ld returned 1 exit status
Вот код, я использую. main Функция находится в самом конце.
/* C code produced by gperf version 3.0.4 */
/* Command-line: gperf sowpods_bkp.txt */
/* Computed positions: -k'3,5' */
#include <string.h>
#include <iostream>
#if !((' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
&& ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
&& (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
&& ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
&& ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
&& ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
&& ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
&& ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
&& ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
&& ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
&& ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
&& ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
&& ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
&& ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
&& ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
&& ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
&& ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
&& ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
&& ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
&& ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
&& ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
&& ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
&& ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126))
/* The character set is not based on ISO-646. */
error "gperf generated tables don't work with this execution character set. Please report a bug to <[email protected]>."
#endif
#define TOTAL_KEYWORDS 16
#define MIN_WORD_LENGTH 2
#define MAX_WORD_LENGTH 10
#define MIN_HASH_VALUE 2
#define MAX_HASH_VALUE 21
/* maximum key range = 20, duplicates = 0 */
#ifdef __GNUC__
__inline
#else
#ifdef __cplusplus
inline
#endif
#endif
static unsigned int hash (register const char *str, register unsigned int len)
{
static unsigned char asso_values[] =
{
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 10, 22,
22, 0, 0, 0, 22, 22, 15, 22, 5, 22,
22, 22, 0, 22, 22, 22, 5, 0, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22
};
register int hval = len;
switch (hval)
{
default:
hval += asso_values[(unsigned char)str[4]];
/*FALLTHROUGH*/
case 4:
case 3:
hval += asso_values[(unsigned char)str[2]];
/*FALLTHROUGH*/
case 2:
break;
}
return hval;
}
#ifdef __GNUC__
__inline
#if defined __GNUC_STDC_INLINE__ || defined __GNUC_GNU_INLINE__
__attribute__ ((__gnu_inline__))
#endif
#endif
const char *in_word_set (register const char *str, register unsigned int len)
{
static const char * wordlist[] =
{
"", "",
"AA",
"AAH",
"AAHS",
"AARGH",
"AARRGH",
"AARRGHH",
"AARDWOLF",
"",
"AARDWOLVES",
"AAHING",
"",
"AARDVARK",
"AARDVARKS",
"AAHED",
"", "",
"AAL",
"AALS",
"AALII",
"AALIIS"
};
if (len <= MAX_WORD_LENGTH && len >= MIN_WORD_LENGTH)
{
register int key = hash (str, len);
if (key <= MAX_HASH_VALUE && key >= 0)
{
register const char *s = wordlist[key];
if (*str == *s && !strcmp (str + 1, s + 1))
return s;
}
}
return 0;
}
int main()
{
in_word_set("AA",2);
return 0;
}
Попробуйте скомпилировать его как код C или перестроить файл, чтобы его сгенерировали как код на C++. –
Попробуйте скомпилировать его без аннотаций 'inline' –
какая версия g ++? –