std::nextafter, std::nexttoward

 

C++

Language

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Utilities library

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Iterators library

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Regular expressions library (C++11)

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Numerics library

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iota (C++11)

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Common mathematical functions

Functions
Basic operations
abs(int) labs llabs imaxabs (C++11) abs(float) fabs div ldiv lldiv imaxdiv (C++11) fmod	remainder (C++11) remquo (C++11) fma (C++11) fmax (C++11) fmin (C++11) fdim (C++11) nan nanf nanl (C++11) (C++11) (C++11)
Exponential functions
exp exp2 (C++11) expm1 (C++11)	log log10 log1p (C++11) log2 (C++11)
Power functions
sqrt cbrt (C++11)	hypot (C++11) pow
Trigonometric and hyperbolic functions
sin cos tan asin acos atan atan2	sinh cosh tanh asinh (C++11) acosh (C++11) atanh (C++11)
Error and gamma functions
erf (C++11) erfc (C++11)	lgamma (C++11) tgamma (C++11)
Nearest integer floating point operations
ceil floor round lround llround (C++11) (C++11) (C++11)	trunc (C++11) nearbyint (C++11) rint lrint llrint (C++11) (C++11) (C++11)
Floating point manipulation functions
ldexp scalbn scalbln (C++11) (C++11) ilogb (C++11) logb (C++11)	frexp modf nextafter nexttoward (C++11) (C++11) copysign (C++11)
Classification
fpclassify (C++11) isfinite (C++11) isinf (C++11)	isnan (C++11) isnormal (C++11) signbit (C++11)
Macro constants
HUGE_VALF HUGE_VAL HUGE_VALL (C++11) (C++11) INFINITY (C++11) NAN (C++11) math_errhandling MATH_ERRNO MATH_ERREXCEPT (C++11)	FP_NORMAL FP_SUBNORMAL FP_ZERO FP_INFINITE FP_NAN (C++11) (C++11) (C++11) (C++11) (C++11) FLT_EVAL_METHOD (C++11)

 

Defined in header <cmath>
float       nextafter( float from, float to );	(1)	(since C++11)
double      nextafter( double from, double to );	(2)	(since C++11)
long double nextafter( long double from, long double to );	(3)	(since C++11)
Promoted    nextafter( Arithmetic from, Arithmetic to );	(4)	(since C++11)
float       nexttoward( float from, long double to );	(5)	(since C++11)
double      nexttoward( double from, long double to );	(6)	(since C++11)
long double nexttoward( long double from, long double to );	(7)	(since C++11)
double      nexttoward( Integral from, long double to );	(8)	(since C++11)

Returns the next representable value of from in the direction of to. If from equals to to, to is returned.

4) If any argument has integral type, it is cast to double. If any other argument is long double, then the return type is long double, otherwise it is double

Parameters

from, to

-

floating point values

Return value

the next representable value of from in the direction of to.