#ifndef H_CSVparser
#define H_CSVparser

#include <vector>
#include <string>

/**
 * @brief Parses a CSV file containing floating-point numbers.
 * 
 * @param filename The name of the CSV file to parse.
 * @return A vector of vectors of doubles containing the parsed data. 
 *         Returns an empty vector if there was an error.
 *
 * This function reads a CSV file containing floating-point numbers and 
 * returns the data as a vector of vectors of doubles. The CSV file should 
 * use commas as delimiters and should not contain any quotes or other 
 * special characters. Each row in the CSV file should have the same number 
 * of columns. If there is an error opening the file or parsing the data, 
 * this function returns an empty vector and prints an error message to 
 * standard error. The error message will indicate the type of error and 
 * the name of the file where the error occurred.
 */
std::vector<std::vector<double>> parse_csv_file(const std::string& filename, char delimiter = ',');

#endif