Function croaring_sys::roaring_bitmap_create_with_capacity

pub unsafe extern "C" fn roaring_bitmap_create_with_capacity(
    cap: u32
) -> *mut roaring_bitmap_t

Dynamically allocates a new bitmap (initially empty). Returns NULL if the allocation fails. Capacity is a performance hint for how many “containers” the data will need. Client is responsible for calling roaring_bitmap_free().