hash_stream:open_hash_stream/3

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Predicate open_hash_stream/3

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open_hash_stream(+OrgStream, -HashStream, +Options) is det

Open a filter stream on OrgStream that maintains a hash. The hash can be retrieved at any time using stream_hash/2. Provided options:

algorithm(+Algorithm): One of md5, sha1, sha224, sha256, sha384 or sha512. Default is sha1.
close_parent(+Bool): If true (default), closing the filter stream also closes the original (parent) stream.