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// Copyright © Tavian Barnes <tavianator@tavianator.com>
// SPDX-License-Identifier: 0BSD
/**
* A dynamic array library.
*
* darrays are represented by a simple pointer to the array element type, like
* any other array. Behind the scenes, the capacity and current length of the
* array are stored along with it. NULL is a valid way to initialize an empty
* darray:
*
* int *darray = NULL;
*
* To append an element to a darray, use the DARRAY_PUSH macro:
*
* int e = 42;
* if (DARRAY_PUSH(&darray, &e) != 0) {
* // Report the error...
* }
*
* The length can be retrieved by darray_length(). Iterating over the array
* works like normal arrays:
*
* for (size_t i = 0; i < darray_length(darray); ++i) {
* printf("%d\n", darray[i]);
* }
*
* To free a darray, use darray_free():
*
* darray_free(darray);
*/
#ifndef BFS_DARRAY_H
#define BFS_DARRAY_H
#include <stddef.h>
/**
* Get the length of a darray.
*
* @param da
* The array in question.
* @return
* The length of the array.
*/
size_t darray_length(const void *da);
/**
* @internal Use DARRAY_PUSH().
*
* Push an element into a darray.
*
* @param da
* The array to append to.
* @param item
* The item to append.
* @param size
* The size of the item.
* @return
* The (new) location of the array.
*/
void *darray_push(void *da, const void *item, size_t size);
/**
* @internal Use DARRAY_PUSH().
*
* Check if the last darray_push() call failed.
*
* @param da
* The darray to check.
* @return
* 0 on success, -1 on failure.
*/
int darray_check(void *da);
/**
* Free a darray.
*
* @param da
* The darray to free.
*/
void darray_free(void *da);
/**
* Push an item into a darray.
*
* @param da
* The array to append to.
* @param item
* A pointer to the item to append.
* @return
* 0 on success, -1 on failure.
*/
#define DARRAY_PUSH(da, item) \
(darray_check(*(da) = darray_push(*(da), (item), sizeof(**(da) = *(item)))))
#endif // BFS_DARRAY_H
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