#include <stdio.h>
#include <stdlib.h>
typedef struct tdelegate { void (*func)(char*);
struct tdelegate *next;
} DELEGATE;
int delegate_add(DELEGATE **pdelegate, void (*funcpointer)(char*)) { DELEGATE *newdelegate = malloc(sizeof(DELEGATE));
DELEGATE *aux = NULL;
if(newdelegate == NULL)
return 0;
newdelegate->func = funcpointer;
newdelegate->next = NULL;
if(*pdelegate == NULL)
*pdelegate = newdelegate;
else { aux = *pdelegate;
while(aux->next != NULL)
aux = aux->next;
aux->next = newdelegate;
}
return 1;
}
void delegate_exec(DELEGATE **pdelegate, char *str) { DELEGATE *actualdelegate = *pdelegate;
while(actualdelegate != NULL) { actualdelegate->func(str);
actualdelegate = actualdelegate->next;
}
}
void delegate_del(DELEGATE **pdelegate, void (*funcpointer)(char*)) { DELEGATE *actualdelegate = *pdelegate;
DELEGATE *aux = NULL;
int found = 0;
if(funcpointer == NULL || actualdelegate == NULL)
return;
if(actualdelegate->func == funcpointer) { aux = actualdelegate->next;
free(actualdelegate);
actualdelegate = aux;
}
else { while(actualdelegate->next != NULL && !found) { if(actualdelegate->next->func == funcpointer) { found = 1;
aux = actualdelegate->next->next;
free(actualdelegate->next);
actualdelegate->next = aux;
}
else actualdelegate = actualdelegate->next;
}
}
}
void delegate_free(DELEGATE **pdelegate) { DELEGATE *aux = NULL;
if(*pdelegate == NULL) return;
while(*pdelegate != NULL) { aux = (*pdelegate)->next;
free(*pdelegate);
*pdelegate = aux;
}
}
/* FUNCIONES DE PRUEBA */
void a(char *str) { printf("%p: %s\n", &a, str);}
void b(char *str) { printf("%p: %s\n", &b, str);}
void c(char *str) { printf("%p: %s\n", &c, str);}
/* PROGRAMA DE PRUEBA */
int main() { DELEGATE *midelegado = NULL;
delegate_add(&midelegado, &a);
delegate_add(&midelegado, &b);
delegate_add(&midelegado, &c);
delegate_exec(&midelegado, "hola");
delegate_del(&midelegado, &b);
delegate_exec(&midelegado, "adios");
delegate_free(&midelegado);
midelegado = NULL;
return 0;
}
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