Trait funty::IsFloat

pub trait IsFloat: IsNumber + LowerExp + UpperExp + Neg + From<f32> + From<i8> + From<i16> + From<u8> + From<u16> {
    type Raw: IsUnsigned;

    const RADIX: u32;
    const MANTISSA_DIGITS: u32;
    const DIGITS: u32;
    const EPSILON: Self;
    const MIN: Self;
    const MIN_POSITIVE: Self;
    const MAX: Self;
    const MIN_EXP: i32;
    const MAX_EXP: i32;
    const MIN_10_EXP: i32;
    const MAX_10_EXP: i32;
    const NAN: Self;
    const INFINITY: Self;
    const NEG_INFINITY: Self;
    const PI: Self;
    const FRAC_PI_2: Self;
    const FRAC_PI_3: Self;
    const FRAC_PI_4: Self;
    const FRAC_PI_6: Self;
    const FRAC_PI_8: Self;
    const FRAC_1_PI: Self;
    const FRAC_2_PI: Self;
    const FRAC_2_SQRT_PI: Self;
    const SQRT_2: Self;
    const FRAC_1_SQRT_2: Self;
    const E: Self;
    const LOG2_E: Self;
    const LOG10_E: Self;
    const LN_2: Self;
    const LN_10: Self;

    fn is_nan(self) -> bool;
    fn is_infinite(self) -> bool;
    fn is_finite(self) -> bool;
    fn is_normal(self) -> bool;
    fn classify(self) -> FpCategory;
    fn is_sign_positive(self) -> bool;
    fn is_sign_negative(self) -> bool;
    fn recip(self) -> Self;
    fn to_degrees(self) -> Self;
    fn to_radians(self) -> Self;
    fn max(self, other: Self) -> Self;
    fn min(self, other: Self) -> Self;
    fn to_bits(self) -> Self::Raw;
    fn from_bits(bits: Self::Raw) -> Self;
}

Declare that a type is a floating-point number.

Associated Types

type Raw: IsUnsigned

The unsigned integer type of the same width as Self.

Associated Constants

const RADIX: u32

The radix or base of the internal representation of f32.

const MANTISSA_DIGITS: u32

Number of significant digits in base 2.

const DIGITS: u32

Approximate number of significant digits in base 10.

const EPSILON: Self

Machine epsilon value for f32.

This is the difference between 1.0 and the next larger representable number.

const MIN: Self

Smallest finite f32 value.

const MIN_POSITIVE: Self

Smallest positive normal f32 value.

const MAX: Self

Largest finite f32 value.

const MIN_EXP: i32

One greater than the minimum possible normal power of 2 exponent.

const MAX_EXP: i32

Maximum possible power of 2 exponent.

const MIN_10_EXP: i32

Minimum possible normal power of 10 exponent.

const MAX_10_EXP: i32

Maximum possible power of 10 exponent.

const NAN: Self

Not a Number (NaN).

const INFINITY: Self

Infinity (∞).

const NEG_INFINITY: Self

Negative infinity (−∞).

const PI: Self

Archimedes’ constant (π)

const FRAC_PI_2: Self

π/2

const FRAC_PI_3: Self

π/3

const FRAC_PI_4: Self

π/4

const FRAC_PI_6: Self

π/6

const FRAC_PI_8: Self

π/8

const FRAC_1_PI: Self

1/π

const FRAC_2_PI: Self

2/π

const FRAC_2_SQRT_PI: Self

2/sqrt(π)

const SQRT_2: Self

sqrt(2)

const FRAC_1_SQRT_2: Self

1/sqrt(2)

const E: Self

Euler’s number (e)

const LOG2_E: Self

log₂(e)

const LOG10_E: Self

log₁₀(e)

const LN_2: Self

ln(2)

const LN_10: Self

ln(10)

Required methods

fn is_nan(self) -> bool

Returns true if this value is NaN.

fn is_infinite(self) -> bool

Returns true if this value is positive infinity or negative infinity, and false otherwise.

fn is_finite(self) -> bool

Returns true if this number is neither infinite nor NaN.

fn is_normal(self) -> bool

Returns true if the number is neither zero, infinite, subnormal, or NaN.

fn classify(self) -> FpCategory

Returns the floating point category of the number. If only one property is going to be tested, it is generally faster to use the specific predicate instead.

fn is_sign_positive(self) -> bool

Returns true if self has a positive sign, including +0.0, NaNs with positive sign bit and positive infinity.

fn is_sign_negative(self) -> bool

Returns true if self has a negative sign, including -0.0, NaNs with negative sign bit and negative infinity.

fn recip(self) -> Self

Takes the reciprocal (inverse) of a number, 1/x.

fn to_degrees(self) -> Self

Converts radians to degrees.

fn to_radians(self) -> Self

Converts degrees to radians.

fn max(self, other: Self) -> Self

Returns the maximum of the two numbers.

fn min(self, other: Self) -> Self

Returns the minimum of the two numbers.

fn to_bits(self) -> Self::Raw

Raw transmutation to u32.

This is currently identical to transmute::<f32, u32>(self) on all platforms.

See from_bits for some discussion of the portability of this operation (there are almost no issues).

Note that this function is distinct from as casting, which attempts to preserve the numeric value, and not the bitwise value.

fn from_bits(bits: Self::Raw) -> Self

Raw transmutation from u32.

This is currently identical to transmute::<u32, f32>(v) on all platforms. It turns out this is incredibly portable, for two reasons:

• Floats and Ints have the same endianness on all supported platforms.
• IEEE-754 very precisely specifies the bit layout of floats.

However there is one caveat: prior to the 2008 version of IEEE-754, how to interpret the NaN signaling bit wasn’t actually specified. Most platforms (notably x86 and ARM) picked the interpretation that was ultimately standardized in 2008, but some didn’t (notably MIPS). As a result, all signaling NaNs on MIPS are quiet NaNs on x86, and vice-versa.

Rather than trying to preserve signaling-ness cross-platform, this implementation favors preserving the exact bits. This means that any payloads encoded in NaNs will be preserved even if the result of this method is sent over the network from an x86 machine to a MIPS one.

If the results of this method are only manipulated by the same architecture that produced them, then there is no portability concern.

If the input isn’t NaN, then there is no portability concern.

If you don’t care about signalingness (very likely), then there is no portability concern.

Note that this function is distinct from as casting, which attempts to preserve the numeric value, and not the bitwise value.

Implementations on Foreign Types

impl IsFloat for f32

type Raw = u32

const RADIX: u32

const MANTISSA_DIGITS: u32

const DIGITS: u32

const EPSILON: Self

const MIN: Self

const MIN_POSITIVE: Self

const MAX: Self

const MIN_EXP: i32

const MAX_EXP: i32

const MIN_10_EXP: i32

const MAX_10_EXP: i32

const NAN: Self

const INFINITY: Self

const NEG_INFINITY: Self

const PI: Self

const FRAC_PI_2: Self

const FRAC_PI_3: Self

const FRAC_PI_4: Self

const FRAC_PI_6: Self

const FRAC_PI_8: Self

const FRAC_1_PI: Self

const FRAC_2_PI: Self

const FRAC_2_SQRT_PI: Self

const SQRT_2: Self

const FRAC_1_SQRT_2: Self

const E: Self

const LOG2_E: Self

const LOG10_E: Self

const LN_2: Self

const LN_10: Self

fn is_nan(self) -> bool

fn is_infinite(self) -> bool

fn is_finite(self) -> bool

fn is_normal(self) -> bool

fn classify(self) -> FpCategory

fn is_sign_positive(self) -> bool

fn is_sign_negative(self) -> bool

fn recip(self) -> Self

fn to_degrees(self) -> Self

fn to_radians(self) -> Self

fn max(self, other: Self) -> Self

fn min(self, other: Self) -> Self

fn to_bits(self) -> Self::Raw

fn from_bits(bits: Self::Raw) -> Self

impl IsFloat for f64

type Raw = u64

const RADIX: u32

const MANTISSA_DIGITS: u32

const DIGITS: u32

const EPSILON: Self

const MIN: Self

const MIN_POSITIVE: Self

const MAX: Self

const MIN_EXP: i32

const MAX_EXP: i32

const MIN_10_EXP: i32

const MAX_10_EXP: i32

const NAN: Self

const INFINITY: Self

const NEG_INFINITY: Self

const PI: Self

const FRAC_PI_2: Self

const FRAC_PI_3: Self

const FRAC_PI_4: Self

const FRAC_PI_6: Self

const FRAC_PI_8: Self

const FRAC_1_PI: Self

const FRAC_2_PI: Self

const FRAC_2_SQRT_PI: Self

const SQRT_2: Self

const FRAC_1_SQRT_2: Self

const E: Self

const LOG2_E: Self

const LOG10_E: Self

const LN_2: Self

const LN_10: Self

fn is_nan(self) -> bool

fn is_infinite(self) -> bool

fn is_finite(self) -> bool

fn is_normal(self) -> bool

fn classify(self) -> FpCategory

fn is_sign_positive(self) -> bool

fn is_sign_negative(self) -> bool

fn recip(self) -> Self

fn to_degrees(self) -> Self

fn to_radians(self) -> Self

fn max(self, other: Self) -> Self

fn min(self, other: Self) -> Self

fn to_bits(self) -> Self::Raw

fn from_bits(bits: Self::Raw) -> Self

Implementors