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+/*
+  Copyright (C) 2018 David Robillard <d@drobilla.net>
+  Copyright (C) 2006-2007 Chris Hamilton <chamilton@cs.dal.ca>
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 2 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+  details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#ifndef CHILBERT_HILBERT_HPP
+#define CHILBERT_HILBERT_HPP
+
+#include <cstddef>
+
+namespace chilbert {
+
+/** Map the point `p` to a Hilbert Index.
+ *
+ * @tparam P Array-like type with [] operator that represents a point.
+ * @tparam H Hilbert Index.
+ *
+ * @param p Point with `n` dimensions.
+ * @param m Precision of each dimension in bits.
+ * @param n Number of dimensions.
+ * @param[out] h Hilbert Index.
+ */
+template <class P, class H>
+inline void coords_to_index(const P& p, size_t m, size_t n, H& h);
+
+/** Map the Hilbert Index `p` to a point.
+ *
+ * @tparam P Array-like type with [] operator that represents a point.
+ * @tparam H Hilbert Index.
+ *
+ * @param[out] p Point with `n` dimensions.
+ * @param m Precision of each dimension in bits.
+ * @param n Number of dimensions.
+ * @param h Hilbert Index.
+ */
+template <class P, class H>
+inline void index_to_coords(P& p, size_t m, size_t n, const H& h);
+
+/** Map the point `p` to a Compact Hilbert Index.
+ *
+ * @tparam P Array-like type with [] operator that represents a point.
+ * @tparam H Compact Hilbert Index.
+ *
+ * @param p Point with `n` dimensions.
+ * @param ms Array of `n` precision values for each dimension in bits.
+ * @param n Number of dimensions.
+ * @param[out] hc Compact Hilbert Index.
+ * @param M Optional net precision (sum of `ms`), the size of `hc` in bits.
+ * @param m Optional largest precision in `m`.
+ */
+template <class P, class H>
+inline void coords_to_compact_index(const P&      p,
+                                    const size_t* ms,
+                                    size_t        n,
+                                    H&            hc,
+                                    size_t        M = 0,
+                                    size_t        m = 0);
+
+/** Map the Compact Hilbert Index `hc` to a point.
+ *
+ * @tparam P Array-like type with [] operator that represents a point.
+ * @tparam H Compact Hilbert Index.
+ *
+ * @param[out] p Point with `n` dimensions.
+ * @param ms Array of `n` precision values for each dimension in bits.
+ * @param n Number of dimensions.
+ * @param hc Compact Hilbert Index.
+ * @param M Optional net precision (sum of `ms`), the size of `hc` in bits.
+ * @param m Optional largest precision in `m`.
+ */
+template <class P, class H>
+inline void compact_index_to_coords(P&            p,
+                                    const size_t* ms,
+                                    size_t        n,
+                                    const H&      hc,
+                                    size_t        M = 0,
+                                    size_t        m = 0);
+
+} // namespace chilbert
+
+#include "chilbert/chilbert.ipp" // IWYU pragma: export
+
+#endif