Rewrite planemap and idalloc in pure C++

luprex/syscpp/util.hpp

@@ -35,5 +35,14 @@ const stringvec trim_and_uncomment(const stringvec &lines);
 std::string get_file_fingerprint(const std::string &path);
 std::string get_file_contents(const std::string &fn);
 
+double distance_squared(double x1, double y1, double x2, double y2);
+
+// Return a pseudorandom number which is a hash function of A,B,C.
+uint32_t hash3(uint32_t a, uint32_t b, uint32_t c);
+
+// Returns a floating point value between lo and hi inclusive.
+double hash_to_float(double lo, double hi, uint32_t a, uint32_t b, uint32_t c);
+
+
 } // namespace util
 #endif // UTIL_HPP