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diff --git a/src/line-snapper.h b/src/line-snapper.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_LINE_SNAPPER_H
+#define SEEN_LINE_SNAPPER_H
+/*
+ * Authors:
+ * Carl Hetherington <inkscape@carlh.net>
+ * Diederik van Lierop <mail@diedenrezi.nl>
+ *
+ * Copyright (C) 1999-2008 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "snapper.h"
+
+namespace Inkscape {
+
+class SnapCandidatePoint;
+
+/**
+ * Superclass for snappers to horizontal and vertical lines.
+ */
+class LineSnapper : public Snapper
+{
+public:
+ LineSnapper(SnapManager *sm, Geom::Coord const d);
+
+ void freeSnap(IntermSnapResults &isr,
+ Inkscape::SnapCandidatePoint const &p,
+ Geom::OptRect const &bbox_to_snap,
+ std::vector<SPObject const *> const *it,
+ std::vector<Inkscape::SnapCandidatePoint> *unselected_nodes) const override;
+
+ void constrainedSnap(IntermSnapResults &isr,
+ Inkscape::SnapCandidatePoint const &p,
+ Geom::OptRect const &bbox_to_snap,
+ SnapConstraint const &c,
+ std::vector<SPObject const *> const *it,
+ std::vector<SnapCandidatePoint> *unselected_nodes) const override;
+
+protected:
+ typedef std::list<std::pair<Geom::Point, Geom::Point> > LineList;
+ //first point is a vector normal to the line
+ //second point is a point on the line
+
+private:
+ /**
+ * \param p Point that we are trying to snap.
+ * \return List of lines that we should try snapping to.
+ */
+ virtual LineList _getSnapLines(Geom::Point const &p) const = 0;
+
+ virtual void _addSnappedLine(IntermSnapResults &isr, Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, Geom::Point const &normal_to_line, Geom::Point const &point_on_line) const = 0;
+
+ // Will only be implemented for guide lines, because grid lines don't have an origin
+ virtual void _addSnappedLinesOrigin(IntermSnapResults &isr, Geom::Point const &origin, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const;
+
+ virtual void _addSnappedLinePerpendicularly(IntermSnapResults &isr, Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const = 0;
+ virtual void _addSnappedPoint(IntermSnapResults &isr, Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const = 0;
+};
+
+}
+
+#endif /* !SEEN_LINE_SNAPPER_H */