text: #ifndef USEFUL_H
  #define USEFUL_H
  
  // Library of functions that are very useful
  // R. Sheehan 4 - 7 - 2011
  
  namespace useful_funcs{
  	
  	std::string TheTime();
  
  	int count_lines(std::string filename); 
  
  	void exit_failure_output(std::string reason);
  
  	void set_directory(std::string &dir_name, bool &dir_set);
  
  	double poly(double x, double *b, int m); // returns the value of a polynomial of degree m whose coefficients are stored in b
  
  }
  
  #endif