Eina_Magic
//Compile with:
//gcc -g eina_magic_01.c -o eina_magic_01 `pkg-config --cflags --libs eina`
#include <Eina.h>
#define BASETYPE_MAGIC 0x12345
struct _person {
EINA_MAGIC;
char *name;
};
typedef struct _person person;
#define SUBTYPE_MAGIC 0x3333
struct _pilot {
person base;
EINA_MAGIC;
char *callsign;
};
typedef struct _pilot pilot;
person *
person_new(const char *name)
{
person *ptr = malloc(sizeof(person));
EINA_MAGIC_SET(ptr, BASETYPE_MAGIC);
ptr->name = strdup(name);
return ptr;
}
void
person_free(person *ptr) {
if (!EINA_MAGIC_CHECK(ptr, BASETYPE_MAGIC))
{
EINA_MAGIC_FAIL(ptr, BASETYPE_MAGIC);
return;
}
EINA_MAGIC_SET(ptr, EINA_MAGIC_NONE);
free(ptr->name);
free(ptr);
}
pilot *
pilot_new(const char *name, const char *callsign)
{
pilot *ptr = malloc(sizeof(pilot));
EINA_MAGIC_SET(ptr, SUBTYPE_MAGIC);
EINA_MAGIC_SET(&ptr->base, BASETYPE_MAGIC);
ptr->base.name = strdup(name);
ptr->callsign = strdup(callsign);
return ptr;
}
void
pilot_free(pilot *ptr) {
if (!EINA_MAGIC_CHECK(ptr, SUBTYPE_MAGIC))
{
EINA_MAGIC_FAIL(ptr, SUBTYPE_MAGIC);
return;
}
EINA_MAGIC_SET(ptr, EINA_MAGIC_NONE);
EINA_MAGIC_SET(&ptr->base, EINA_MAGIC_NONE);
free(ptr->base.name);
free(ptr->callsign);
free(ptr);
}
void
print_person(person *ptr)
{
if (!EINA_MAGIC_CHECK(ptr, BASETYPE_MAGIC)){
EINA_MAGIC_FAIL(ptr, BASETYPE_MAGIC);
return;
}
printf("name: %s\n", ptr->name);
}
void
print_pilot(pilot *ptr)
{
if (!EINA_MAGIC_CHECK(ptr, SUBTYPE_MAGIC)) {
EINA_MAGIC_FAIL(ptr, SUBTYPE_MAGIC);
return;
}
print_person(&ptr->base);
printf("callsign: %s\n", ptr->callsign);
}
int
main(int argc EINA_UNUSED, char **argv EINA_UNUSED)
{
person *base;
pilot *sub;
eina_init();
eina_magic_string_set(BASETYPE_MAGIC, "person");
eina_magic_string_static_set(SUBTYPE_MAGIC, "pilot");
base = person_new("Tyrol");
sub = pilot_new("thrace", "starbuck");
print_person(base);
print_person((person *)sub);
print_pilot(base); //BAD
print_pilot(sub);
eina_shutdown();
}