Some Useful Functions ( misc )

The following functions and macros are defined in < LEDA/core/misc.htex2html_wrap_inline> .

int	read_int(string s)	prints s and reads an integer from cin.
double	read_real(string s)	prints s and reads a real number from cin.
string	read_string(string s)	prints s and reads a line from cin.
char	read_char(string s)	prints s and reads a character from cin.
int	Yes(string s)	returns (read_char(s) == `y').
bool	get_environment(string var)
		returns true if variable var is defined in the current environment and false otherwise.
bool	get_environment(string var, string& val)
		if variable var is defined in the current environment its value is assigned to val and the result is true. Otherwise, the result is false.
double	cpu_time()	returns the currently used cpu time in seconds. (The class timer in Section timer provides a nicer interface for time measurements.)
double	cpu_time(double& T)	returns the cpu time used by the program from time T up to this moment and assigns the current time to T.
float	elapsed_time()	returns the current daytime time in seconds.
float	elapsed_time(float& T)	returns the elapsed time since time T and assigns the current elapsed time to T.
float	real_time()	same as elapsed$\_$time().
float	real_time(float& T)	same as elapsed$\_$time(T).
void	print_statistics()	prints a summary of the currently used memory, which is used by LEDA's internal memory manager. This only reports on memory usage of LEDA's internal types and user-defined types that implement the LEDA_MEMORY macro (see Section ).
bool	is_space(char c)	returns true is c is a white space character.
void	sleep(double sec)	suspends execution for sec seconds.
void	wait(double sec)	suspends execution for sec seconds.
double	truncate(double x, int k = 10)
		returns a double whose mantissa is truncated after k - 1 bits after the binary point, i.e, if x $\not=$ 0 then the binary representation of the mantissa of the result has the form d.dddddddd, where the number of d's is equal to k. There is a corresponding function for integers; it has no effect.
template <class T>
const T&	min(const T& a, const T& b)
		returns the minimum of a and b.
template <class T>
const T&	max(const T& a, const T& b)
		returns the maximum of a and b.
template <class T>
void	swap(T& a, T& b)	swaps values of a and b.