ON_DBL Class Reference

#include <opennurbs_defines.h>

Static Public Member Functions
static int	Compare (const double *lhs, const double *rhs)
	Well ordered compare that handles nullpt and nans and sorts them to the end. ON_DBL::Compare(nullptr, nullptr) = 0; ON_DBL::Compare(not nullptr, nullptr) = -1; ON_DBL::Compare(nullptr, not nullptr) = +1; ON_DBL::Compare(not nullptr, not nullptr) = ON_DBL::CompareValue(*lhs,*rhs); More...
static int	CompareValue (double lhs, double rhs)
	Well ordered compare that handles nans and sorts them to the end. ON_DBL::CompareValue(nan, nan) = 0; ON_DBL::CompareValue(non_nan, nan) = -1; ON_DBL::CompareValue(nan, non_nan) = +1; More...
static bool	IsInfinity (double x)
static bool	IsNan (double x)
static bool	IsNegativeInfinity (double x)
static bool	IsNotNan (double x)
static bool	IsPositiveInfinity (double x)
static bool	IsUnset (double x)
static bool	IsValid (double x)
	All nans, +infinity, -infinity, x <= than ON_DBL::Unset and x >= ON_DBL::PositiveUnset are considered invalid because using them in typical calculations almost always returns useless results. More...
static int	Sign (double x)

Static Public Attributes
static const double	Nan
	ON_DBL::Nan is an IEEE quiet nan (not a number). More...
static const double	NegativeInfinity
	ON_DBL::NegativeInfinity is IEEE -infinity. More...
static const double	NegativeMax
	ON_DBL::NegativeMax = -1.7976931348623158e+308 More...
static const double	NegativeMin
	ON_DBL::NegativeMax = -2.22507385850720200e-308 More...
static const double	PositiveInfinity
	ON_DBL::PositiveInfinity is IEEE +infinity. More...
static const double	PositiveMax
	ON_DBL::PositiveMax = +1.7976931348623158e+308 More...
static const double	PositiveMin
	ON_DBL::PositiveMax = +2.22507385850720200e-308 More...
static const double	PositiveUnset
	ON_DBL::PositiveUnset = +1.23432101234321e+308 More...
static const double	Unset
	ON_DBL::Unset = -1.23432101234321e+308 More...

Member Function Documentation

Compare()

static int ON_DBL::Compare ( const double *  lhs, const double *  rhs  )

static

Well ordered compare that handles nullpt and nans and sorts them to the end. ON_DBL::Compare(nullptr, nullptr) = 0; ON_DBL::Compare(not nullptr, nullptr) = -1; ON_DBL::Compare(nullptr, not nullptr) = +1; ON_DBL::Compare(not nullptr, not nullptr) = ON_DBL::CompareValue(*lhs,*rhs);

Parameters

lhs
rhs

Returns

CompareValue()

static int ON_DBL::CompareValue ( double  lhs, double  rhs  )

static

Well ordered compare that handles nans and sorts them to the end. ON_DBL::CompareValue(nan, nan) = 0; ON_DBL::CompareValue(non_nan, nan) = -1; ON_DBL::CompareValue(nan, non_nan) = +1;

Parameters

lhs
rhs

Returns

-1 if lhs < rhs or IsNotNan(lhs) and IsNan(rhs). 0 if lhs == rhs or IsNan(lhs) && IsNan(rhs). +1 if lhs > rhs or IsNotNan(lhs) && IsNan(rhs).

IsInfinity()

static bool ON_DBL::IsInfinity ( double  x )

static

Parameters

x

Returns

True if x is any type of infinity (positive, negative, projective).

IsNan()

static bool ON_DBL::IsNan ( double  x )

static

Parameters

x

Returns

True if x is any type of nan (signaling or quiet).

IsNegativeInfinity()

static bool ON_DBL::IsNegativeInfinity ( double  x )

static

IsNotNan()

static bool ON_DBL::IsNotNan ( double  x )

static

Parameters

x

Returns

True if x is not a nan..

IsPositiveInfinity()

static bool ON_DBL::IsPositiveInfinity ( double  x )

static

IsUnset()

static bool ON_DBL::IsUnset ( double  x )

static

IsValid()

static bool ON_DBL::IsValid ( double  x )

static

All nans, +infinity, -infinity, x <= than ON_DBL::Unset and x >= ON_DBL::PositiveUnset are considered invalid because using them in typical calculations almost always returns useless results.

Parameters

x	value to test.

Returns

(ON_DBL::Unset < x && x < ON_DBL::PositiveUnset)

Sign()

static int ON_DBL::Sign ( double  x )

static

Parameters

x

Returns

If x > 0, then +1 is returned. If x < 0, then -1 is returned. Otherwise 0 is returned.

Member Data Documentation

Nan

const double ON_DBL::Nan

static

ON_DBL::Nan is an IEEE quiet nan (not a number).

NegativeInfinity

const double ON_DBL::NegativeInfinity

static

ON_DBL::NegativeInfinity is IEEE -infinity.

NegativeMax

const double ON_DBL::NegativeMax

static

ON_DBL::NegativeMax = -1.7976931348623158e+308

NegativeMin

const double ON_DBL::NegativeMin

static

ON_DBL::NegativeMax = -2.22507385850720200e-308

PositiveInfinity

const double ON_DBL::PositiveInfinity

static

ON_DBL::PositiveInfinity is IEEE +infinity.

PositiveMax

const double ON_DBL::PositiveMax

static

ON_DBL::PositiveMax = +1.7976931348623158e+308

PositiveMin

const double ON_DBL::PositiveMin

static

ON_DBL::PositiveMax = +2.22507385850720200e-308

PositiveUnset

const double ON_DBL::PositiveUnset

static

ON_DBL::PositiveUnset = +1.23432101234321e+308

Unset

const double ON_DBL::Unset

static

ON_DBL::Unset = -1.23432101234321e+308