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#ifndef POC__SHAPE_H
#define POC__SHAPE_H
struct shape;
/* Calculates the area of the shape and returns the value. */
double shape_area(struct shape *shape);
typedef double (*shape_area_t)(struct shape *);
/* Deallocates the object. */
void shape_destroy(struct shape *shape);
typedef void (*shape_destroy_t)(struct shape *);
struct shape *shape_create(
void *obj,
shape_area_t area,
shape_destroy_t destroy);
#endif
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