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diff --git a/src/alignment-snapper.h b/src/alignment-snapper.h
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+++ b/src/alignment-snapper.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** \file
+ * Authors:
+ *   Parth Pant <parthpant4@gmail.com>
+ *
+ * Copyright (C) 2021 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_ALIGNMENT_SNAPPER_H
+#define SEEN_ALIGNMENT_SNAPPER_H
+
+#include <2geom/affine.h>
+#include <memory>
+
+#include "snap-enums.h"
+#include "snapper.h"
+#include "snap-candidate.h"
+
+class SPDesktop;
+class SPNamedView;
+class SPObject;
+class SPPath;
+class SPDesktop;
+
+namespace Inkscape
+{
+
+/**
+ * Snapping things to on-canvas alignment guides
+ */
+class AlignmentSnapper : public Snapper
+{
+
+public:
+    AlignmentSnapper(SnapManager *sm, Geom::Coord const d);
+    ~AlignmentSnapper() override;
+
+    /**
+     * @return true if this Snapper will snap at least one kind of point.
+     */
+    bool ThisSnapperMightSnap() const override;
+
+    /**
+     * @return Snap tolerance (desktop coordinates); depends on current zoom so that it's always the same in screen pixels.
+     */
+    Geom::Coord getSnapperTolerance() const override; //returns the tolerance of the snapper in screen pixels (i.e. independent of zoom)
+
+    bool getSnapperAlwaysSnap() const override; //if true, then the snapper will always snap, regardless of its tolerance
+
+    void freeSnap(IntermSnapResults &isr,
+                  Inkscape::SnapCandidatePoint const &p,
+                  Geom::OptRect const &bbox_to_snap,
+                  std::vector<SPObject const *> const *it,
+                  std::vector<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;
+
+private:
+    std::unique_ptr<std::vector<SnapCandidatePoint>> _points_to_snap_to;
+
+    /** Collects and caches points on bounding boxes of the candidates
+     * @param is the point first point in the selection?
+     */
+    void _collectBBoxPoints(bool const &first_point) const;
+
+    void _snapBBoxPoints(IntermSnapResults &isr,
+                         SnapCandidatePoint const &p,
+                         std::vector<SnapCandidatePoint> *unselected_nodes,
+                         SnapConstraint const &c =  SnapConstraint(),
+                         Geom::Point const &p_proj_on_constraint = Geom::Point()) const;
+
+    SnapSourceType source2alignment(SnapSourceType s) const;
+
+    bool _allowSourceToSnapToTarget(SnapSourceType source, SnapTargetType target, bool strict_snapping) const;
+
+}; // end of AlignmentSnapper class
+
+} // end of namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :