fixed Class Reference

Implement a fixed-point number class. Values have places places after the decimal point. All arithmetic follows the usual rules. More...

#include <fixed.hpp>

Public Types
typedef int	value_type
	Type of the actual value.

Public Member Functions
	fixed ()
	Default constructor initializes to zero.
	fixed (value_type integer, value_type fraction)
	fixed (value_type integer)
	Construct from an integer, with no fraction.
	fixed (double value)
	Construct by rounding off a floating point number.
std::string	as_string () const
bool	read (std::istream &strm)
double	as_long_double () const
	Convert to long double.
double	as_double () const
	Convert to double.
float	as_float () const
	Convert to float.
value_type	round () const
value_type	integer () const
	Return the integer part (which is the same as trunc()).
value_type	fraction () const
	Return the fractional part, e.g., 3 for 12.03.
fixed &	operator+= (fixed f)
	Addition assignment operator.
fixed &	operator-= (fixed f)
	Subtraction assignment operator.
fixed &	operator*= (fixed f)
	Multiplication assignment operator.
fixed &	operator/= (fixed f)
	Division assignment operator.
void	negate ()
	Negate this value.
fixed &	operator++ ()
	Pre-increment.
fixed	operator++ (int)
	Post-increment.
fixed &	operator-- ()
	Pre-decrement.
fixed	operator-- (int)
	Post-decrement.
value_type	value () const
	Return the internal value.

Static Public Attributes
static int const	places = 4
	number of decimal places
static value_type const	places10 = 10000
	10places

Detailed Description

Implement a fixed-point number class. Values have places places after the decimal point. All arithmetic follows the usual rules.

Definition at line 37 of file fixed.hpp.

Constructor & Destructor Documentation

fixed::fixed	(	value_type	integer,
		value_type	fraction
	)

Construct from separate integer and fractional parts, e.g., initialize to 123.45 with fixed(123, 45). Initialize to 12.07 with fixed(12, 7).

Definition at line 14 of file fixed.cpp.

References fraction(), and places10.

Member Function Documentation

std::string fixed::as_string

(

)

const

Convert to a string.

Returns

a string representation of the value, e.g., "123.04"

Definition at line 120 of file fixed.cpp.

References fraction(), integer(), and places.

Referenced by operator<<().

bool fixed::read

(

std::istream &

strm

)

Read from a stream. Overwrite this value with the value read from the stream.

Parameters

strm	the stream to read

Returns

true for success or false for failure

Definition at line 190 of file fixed.cpp.

References fraction(), integer(), places, and places10.

Referenced by operator>>().

fixed::value_type fixed::round

(

)

const

Return just the integer part, rounded off to the nearest integer. If the value lies equidistant between two integers, round even numbers up and odd numbers down (banker's rounding).

Definition at line 104 of file fixed.cpp.

References fraction(), integer(), places10, and value().

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The documentation for this class was generated from the following files:

• fixed.hpp
• fixed.cpp