#ifndef _WORD_H_#define _WORD_H_#include <climits>#include <cstring>#include "memory.h"namespace rmmseg{    const int word_embed_len = 4; /* at least 1 char (3 bytes+'\0') */    struct Word    {        unsigned char   nbytes;   /* number of bytes */        char            length;   /* number of characters */        unsigned short  freq;        char            text[word_embed_len];    };    /**     * text: the text of the word.     * length: number of characters (not bytes).     * freq: the frequency of the word.     */    inline Word *make_word(const char *text, int length=1,                           int freq=0, int nbytes=-1)    {        if (freq > USHRT_MAX)            freq = USHRT_MAX;   /* avoid overflow */        if (nbytes == -1)            nbytes = strlen(text);        Word *w = static_cast<Word *>(pool_alloc(sizeof(Word)                                                 + nbytes+1                                                 - word_embed_len));        w->nbytes = std::strlen(text);        w->length = length;        w->freq = freq;        std::strncpy(w->text, text, nbytes);        w->text[nbytes] = '\0';        return w;    }}#endif /* _WORD_H_ */