[Tile-serving] [openstreetmap/osm2pgsql] Use libosmium for geometry building (#684)

[Paul Norman]

pnorman commented on this pull request.



> +        }
+
+        return std::abs(total) * 0.5;
+    }
+
+    template <typename T>
+    T read_data()
+    {
+        auto *data = reinterpret_cast<T const *>(m_wkb + m_pos);
+        m_pos += sizeof(T);
+
+        return *data;
+    }
+
+    char const *m_wkb;
+    unsigned m_pos;

should this be `size_t`? msvc is generating warnings about conversion from `size_t` to `unsigned int` elsewhere?

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