#ifndef VECTOR_H_
#define VECTOR_H_

typedef struct _vector vector;
typedef void (*mapCallback) (void *object);

/**
 * Creates a new vector.
 * 
 * @return A pointer to the newly created vector on success; otherwise NULL.
 */
vector *vectorCreate(void);

/**
 * Destroys the vector v. This is done by first calling the destroy callback
 * function on each element in the vector then free'ing the vector itself.
 * 
 * @param v The vector to destroy.
 */ 
void vectorDestroy(vector *v);

/**
 * Adds object to the vector v.
 * 
 * @param v The vector to add the object onto.
 * @param object    The object to add.
 * @return A pointer to object.
 */
void *vectorAdd(vector *v, void *object);

/**
 * Returns a pointer to the object at offset index for the vector v.
 *
 * @param v The vector to return the item from.
 * @param index The index of the desired item.
 * @return A pointer to the object/item, or NULL if no such item exists.
 */
void *vectorAt(vector *v, int index);

/**
 * A convenience method that returns the most recently added item to the vector
 * v. It is functionally equivalent to: vectorAt(v, vectorSize(v)).
 *
 * @param v The vector to return the last item of.
 * @return The last item in the vector.
 */
void *vectorHead(vector *v);

/**
 * 
 */
void *vectorSetAt(vector *v, int index, void *object);

/**
 * Removes the item at index from the vector v.
 *
 * @param v The vector to remove the item from.
 * @param index The index of the item to remove.
 */
void vectorRemoveAt(vector *v, int index);

/**
 * Iterates through each item in the vector v calling cb(vectorAt(v, index)).
 *
 * @param v The vector to map/iterate over.
 * @param cb    The function to call.
 */
void vectorMap(vector *v, mapCallback cb);

/**
 * Invokes vectorMap(v, cb) followed by vectorDestroy(v). This allows for the
 * elements in the vector to be free'ed/destroyed in order to prevent memory
 * leaks.
 *
 * @param v The vector to map over and destroy.
 * @param cb    The function to call.
 */
void vectorMapAndDestroy(vector *v, mapCallback cb);

/**
 * Returns the number of elements in the vector v.
 *
 * @param v The vector to get the number of elements of.
 * @return The number of elements in the vector.
 */
int vectorSize(vector *v);

#endif /*VECTOR_H_*/