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There exist two typical ways to use an array:
1) to hold pointers to externally allocated memory regions
Use array_init(...) for initialization, an element has the
size of a pointer. Use the functions suffixed with `_ptr'
to manage your pointers. The cleanup function array_release_full
must only be used with this type of array.
2) to hold arbitrary sized objects
Use array_init_sized(...) to specify the size of a single
element. Use the regular (i.e. without the `_ptr' suffix)
functions to manage your objects. array_get will return a
pointer to the object stored within the array.
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