This class is used to instantiate a global singleton object Digits which behaves just like Maple's Digits. More...

#include <numeric.h>

Public Member Functions
	_numeric_digits ()
	_numeric_digits default ctor, checking for singleton invariance.
_numeric_digits &	operator= (long prec)
	Assign a native long to global Digits object.
	operator long ()
	Convert global Digits object to native type long.
void	print (std::ostream &os) const
	Append global Digits object to ostream.
void	add_callback (digits_changed_callback callback)
	Add a new callback function.
Private Attributes
long	digits
	Number of decimal digits.
std::vector < digits_changed_callback >	callbacklist
Static Private Attributes
static bool	too_late = false
	Already one object present.

Detailed Description

This class is used to instantiate a global singleton object Digits which behaves just like Maple's Digits.

We need an object rather than a dumber basic type since as a side-effect we let it change cl_default_float_format when it gets changed. The only other meaningful thing to do with it is converting it to an unsigned, for temprary storing its value e.g. The user must not create an own working object of this class! Since C++ forces us to make the class definition visible in order to use an object we put in a flag which prevents other objects of that class to be created.

Definition at line 57 of file numeric.h.