int grid_rows;

int grid_cols;

double grid_degrees;

unsigned int max_pair_length;

std::vector < double > resolution_levels;

double clip_lat(double lat);

double clip_longitude(double longitude);

double lat_precision(unsigned int length);

std::vector < double > olc_decode_single(std::string olc);

std::string olc_encode_single(double lat, double longitude, unsigned int output_length);

std::vector < double > olc_decode_pair(std::string code, int offset);

std::vector < double > olc_decode_grid(std::string code);

CharacterVector olc_encode_vector(NumericVector latitude, NumericVector longitude,

IntegerVector code_length);

DataFrame olc_decode_vector(CharacterVector olcs);

olc_coders();