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104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
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/** @file
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* @brief Functions to assist creating language-idiomatic iterator wrappers.
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*/
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/* Copyright (C) 2014,2016,2017,2019 Olly Betts
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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* USA
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*/
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#ifndef XAPIAN_INCLUDED_ITERATOR_H
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#define XAPIAN_INCLUDED_ITERATOR_H
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/* These functions are not intended to be used from user C++ code - they are
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* provided to make implementing language-idiomatic wrappers around Xapian's
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* iterator classes easier in bindings for other languages.
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*
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* If you make use of this API, please let us know on xapian-devel so we can
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* coordinate any incompatible changes which might be required in the future.
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*
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* Currently known users:
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*
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* * xapian-bindings:
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* + Java
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* + PHP
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* * xapian-core:
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* + examples/xapian-pos.cc
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* * xapian-glib
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*/
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#include <xapian.h>
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namespace Xapian {
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/** @internal Determine if iterator is valid to dereference. */
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inline bool iterator_valid(const Xapian::ESetIterator& it) {
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return it.off_from_end != 0;
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}
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/** @internal Determine if iterator is valid to dereference. */
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inline bool iterator_valid(const Xapian::MSetIterator& it) {
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return it.off_from_end != 0;
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}
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/** @internal Rewind iterator. */
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inline void iterator_rewind(Xapian::ESetIterator& it) {
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it.off_from_end = it.eset.size();
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}
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/** @internal Rewind iterator. */
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inline void iterator_rewind(Xapian::MSetIterator& it) {
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it.off_from_end = it.mset.size();
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}
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/** @internal Is the iterator at the start? */
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inline bool iterator_rewound(Xapian::ESetIterator& it) {
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return it.off_from_end == it.eset.size();
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}
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/** @internal Is the iterator at the start? */
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inline bool iterator_rewound(Xapian::MSetIterator& it) {
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return it.off_from_end == it.mset.size();
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}
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/** @internal Determine if iterator is valid to dereference. */
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inline bool iterator_valid(const Xapian::PositionIterator& it) {
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return it.internal != NULL;
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}
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/** @internal Determine if iterator is valid to dereference. */
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inline bool iterator_valid(const Xapian::PostingIterator& it) {
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return it.internal != NULL;
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}
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/** @internal Determine if iterator is valid to dereference. */
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inline bool iterator_valid(const Xapian::TermIterator& it) {
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return it.internal != NULL;
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}
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/** @internal Determine if iterator is valid to dereference. */
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inline bool iterator_valid(const Xapian::ValueIterator& it) {
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return it.internal != NULL;
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}
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/** @internal Determine if iterator is valid to dereference. */
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inline bool iterator_valid(const Xapian::Utf8Iterator& it) {
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return it != Xapian::Utf8Iterator();
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}
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}
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#endif // XAPIAN_INCLUDED_ITERATOR_H
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