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diff --git a/examples/redis-unstable/src/geohash_helper.h b/examples/redis-unstable/src/geohash_helper.h
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+/*
+ * Copyright (c) 2013-2014, yinqiwen <yinqiwen@gmail.com>
+ * Copyright (c) 2014, Matt Stancliff <matt@genges.com>.
+ * Copyright (c) 2015-current, Redis Ltd.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  * Neither the name of Redis nor the names of its contributors may be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GEOHASH_HELPER_HPP_
+#define GEOHASH_HELPER_HPP_
+
+#include "geohash.h"
+
+#define GZERO(s) s.bits = s.step = 0;
+#define GISZERO(s) (!s.bits && !s.step)
+#define GISNOTZERO(s) (s.bits || s.step)
+
+typedef uint64_t GeoHashFix52Bits;
+typedef uint64_t GeoHashVarBits;
+
+typedef struct {
+    GeoHashBits hash;
+    GeoHashArea area;
+    GeoHashNeighbors neighbors;
+} GeoHashRadius;
+
+uint8_t geohashEstimateStepsByRadius(double range_meters, double lat);
+int geohashBoundingBox(GeoShape *shape, double *bounds);
+GeoHashRadius geohashCalculateAreasByShapeWGS84(GeoShape *shape);
+GeoHashFix52Bits geohashAlign52Bits(const GeoHashBits hash);
+double geohashGetDistance(double lon1d, double lat1d,
+                          double lon2d, double lat2d);
+int geohashGetDistanceIfInRadius(double x1, double y1,
+                                 double x2, double y2, double radius,
+                                 double *distance);
+int geohashGetDistanceIfInRadiusWGS84(double x1, double y1, double x2,
+                                      double y2, double radius,
+                                      double *distance);
+int geohashGetDistanceIfInRectangle(double width_m, double height_m, double x1, double y1,
+                                    double x2, double y2, double *distance);
+
+#endif /* GEOHASH_HELPER_HPP_ */