나는 많이 씀..

딴사람은 잘 안쓰는거 같음..

근대 은근 편함...

전에 보니까 버클리DB c api 가 그렇게 되어 있더라..

아래는 예제...
--------------------------------------------

#include<stdio.h>
#include<string.h>
#include<stdlib.h>

 

#define JOB_LEN 1
#define JOB_EQU 2
#define JOB_IND 3

typedef struct _fun_class{
      char *string;
      int job;
      int (*length)(struct _fun_class *);
      int (*equals)(struct _fun_class *, char*);
      int (*indexOf)(struct _fun_class *, char*);
      int (*whichJob)(struct _fun_class *, char*, int);
}_fun_class;

 

 

int length(_fun_class *me)
{
   if(me->string)
      return strlen(me->string);

   return 0;
}

 

int equals(_fun_class *me, char *tgt)
{
   if(me->string){
      return (strcmp(me->string, tgt))?0:1;
   }
   return 0;
}

int indexOf(_fun_class *me, char *tgt)
{
   if(me->string){
      char *p;
      p = strstr(me->string, tgt);
      if(p){
  return (p-(me->string));
      }else{
  return -1;
      }

   }
   return -1;
}

 

int whichJob(struct _fun_class *me, char*str, int job)
{
   if(job == JOB_LEN){
      return me->length(me);
   }else if(job == JOB_EQU){
      return me->equals(me, str);
   }else if(job == JOB_IND){
      return me->indexOf(me, str);
   } /* if(job == JOB_LEN){ */

   return 0;
}

_fun_class *my_new_string(char *str)
{
   _fun_class *myString;

   myString = (_fun_class *)malloc(sizeof(_fun_class));

   myString->length = length;
   myString->equals = equals;
   myString->indexOf = indexOf;
   myString->whichJob = whichJob;
   myString->job = 0;
  
   if(str){
      myString->string = strdup(str);
   }else{
      myString->string = NULL;
   }     
}

void my_delete_string(_fun_class *myString)
{
   if(myString->string) free(myString->string);
   if(myString) free(myString);
}

 

int main()
{
   _fun_class *myString = NULL;

   myString = my_new_string("아버지가 방에 들어 가신다.");

   printf("str : %s\n", myString->string);
   printf("length : %d\n", myString->length(myString));
   printf("equals : %d\n", myString->equals(myString, "아버지"));
   printf("equals : %d\n", myString->equals(myString, "아버지가 방에 들어 가신다."));
   printf("indexOf : %d\n", myString->indexOf(myString, "방에"));
   printf("indexOf : %d\n", myString->indexOf(myString, "가신"));

   printf("JOB_LEN : %d\n", myString->whichJob(myString, "가방", JOB_LEN));
   printf("JOB_EQU : %d\n", myString->whichJob(myString, "가방", JOB_EQU));
   printf("JOB_IND : %d\n", myString->whichJob(myString, "가방", JOB_IND));

   my_delete_string(myString);
}