Attean::API::Iterator - Online Linux Manual PageSection : 3
Updated : 2021-02-08
Source : perl v5.32.1
Note : User Contributed Perl Documentation
NAMEAttean::API::Iterator − Typed iterator
VERSIONThis document describes Attean::API::Iterator version 0.030
DESCRIPTIONThe Attean::API::Iterator role defines a common API for typed iterators. This package also defines several type-specific iterator roles: • Attean::API::TripleIterator • Attean::API::QuadIterator • Attean::API::MixedStatementIterator • Attean::API::ResultIterator These roles will automatically be applied to iterators during construction when appropriate.
ATTRIBUTESThe following attributes exist: item_type A string indicating the type of elements returned by the iterator.
REQUIRED METHODSThe following methods are required by the Attean::API::Iterator role: next Returns the next element from the iterator, or undef upon exhaustion.
METHODSThe Attean::API::Iterator role provides default implementations of the following methods: elements Returns a list of all remaining elements in the iterator. map( \&mapper [, $result_type] ) Returns a new Attean::API::Iterator object with each element mapped using the supplied &mapper function. If the iterator elements are of the same type as those in the referent iterator, only a mapping function is required. Otherwise, the supplied Type::Tiny $result_type object must indicate the new iterator's type information. grep( \&filter ) Returns a new Attean::API::Iterator object that filters elements from the referent iterator based on whether calling &filter( $element ) for each ​$element results in a true value. offset( $offset ) Returns the Attean::API::Iterator referent after skipping the first ​$offset elements. limit( $limit ) Returns a new Attean::API::Iterator object which returns the first ​$limit elements of the referent. materialize Returns a new Attean::API::RepeatableIterator object containing all the elements from the referent. debug( [$name] ) Print each item as it is consumed (with the string generated by as_string), prepended by $name.
Methods on Roles Supporting StringificationFor iterators over roles that provide an as_string method, extra methods are provided. These iterators are: Attean::API::ResultOrTermIterator Attean::API::StatementIterator Attean::API::MixedStatementIterator Attean::API::ResultIterator Attean::API::TermIterator They provide the following methods: uniq Returns a new iterator providing unique results (based on the stringified value of the underlying elements).
BUGSPlease report any bugs or feature requests to through the GitHub web interface at <https://github.com/kasei/attean/issues>.
SEE ALSOAttean::API::RepeatableIterator
AUTHORGregory Todd Williams <gwilliams@cpan.org>
COPYRIGHTCopyright (c) 2014−−2020 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. 0
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