request polyline with precision of 5 or 6 positions (#3220)

src/engine/polyline_compressor.cpp

@@ -10,7 +10,7 @@ namespace osrm
 {
 namespace engine
 {
-namespace /*detail*/ // anonymous to keep TU local
+namespace detail // anonymous to keep TU local
 {
 
 std::string encode(int number_to_encode)
@@ -55,35 +55,6 @@ std::string encode(std::vector<int> &numbers)
     }
     return output;
 }
-} // anonymous ns
-
-std::string encodePolyline(CoordVectorForwardIter begin, CoordVectorForwardIter end)
-{
-    auto size = std::distance(begin, end);
-    if (size == 0)
-    {
-        return {};
-    }
-
-    std::vector<int> delta_numbers;
-    BOOST_ASSERT(size > 0);
-    delta_numbers.reserve((size - 1) * 2);
-    int current_lat = 0;
-    int current_lon = 0;
-    std::for_each(
-        begin, end, [&delta_numbers, &current_lat, &current_lon](const util::Coordinate loc) {
-            const int lat_diff =
-                std::round(static_cast<int>(loc.lat) * detail::COORDINATE_TO_POLYLINE) -
-                current_lat;
-            const int lon_diff =
-                std::round(static_cast<int>(loc.lon) * detail::COORDINATE_TO_POLYLINE) -
-                current_lon;
-            delta_numbers.emplace_back(lat_diff);
-            delta_numbers.emplace_back(lon_diff);
-            current_lat += lat_diff;
-            current_lon += lon_diff;
-        });
-    return encode(delta_numbers);
 }
 
 std::vector<util::Coordinate> decodePolyline(const std::string &geometry_string)