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=encoding utf8

=head1 NAME

Lucy::Index::PostingList - Term-Document pairings.

=head1 SYNOPSIS

    my $posting_list_reader 
        = $seg_reader->obtain("Lucy::Index::PostingListReader");
    my $posting_list = $posting_list_reader->posting_list( 
        field => 'content',
        term  => 'foo',
    );
    while ( my $doc_id = $posting_list->next ) {
        say "Matching doc id: $doc_id";
    }

=head1 DESCRIPTION

PostingList is an iterator which supplies a list of document ids that match
a given term.

See L<IRTheory|Lucy::Docs::IRTheory> for definitions of “posting” and
“posting list”.

=head1 ABSTRACT METHODS

=head2 get_doc_freq

    my $int = $posting_list->get_doc_freq();

Return the number of documents that the PostingList contains.  (This
number will include any documents which have been marked as deleted but
not yet purged.)

=head2 seek

    $posting_list->seek($target);
    $posting_list->seek();  # default: undef

Prepare the PostingList object to iterate over matches for documents
that match C<target>.

=over

=item *

B<target> - The term to match.  If undef, the iterator will
be empty.

=back

=head1 INHERITANCE

Lucy::Index::PostingList isa L<Lucy::Search::Matcher> isa Clownfish::Obj.

=cut