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publicly export constraint::Constraint but seal it #35

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publicly export constraint::Constraint but seal it #35

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14a2512
publicly export `constraint::Constraint` but seal it
changhe3 Sep 7, 2021
46eb0d6
Merge branch 'upstream' into sealed_constraint_trait
changhe3 Sep 8, 2021
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16 changes: 11 additions & 5 deletions src/constraint.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,13 +17,15 @@ pub trait SubsetOf<P> {}

impl<P, Q> SubsetOf<Q> for P where Q: SupersetOf<P> {}

pub trait Sealed {}

/// Describes constraints on the set of floating-point values that a proxy type
/// may represent.
///
/// This trait expresses a constraint by filter-mapping values. Note that
/// constraints require `Member<RealSet>`, meaning that the set of real numbers
/// must always be supported and is implied.
pub trait Constraint<T>: Member<RealSet>
pub trait Constraint<T>: Member<RealSet> + Sealed
where
T: Float + Primitive,
{
Expand Down Expand Up @@ -52,6 +54,8 @@ where
}
}

impl<T> Sealed for UnitConstraint<T> where T: Float + Primitive {}

impl<T> Member<InfiniteSet> for UnitConstraint<T> where T: Float + Primitive {}

impl<T> Member<NanSet> for UnitConstraint<T> where T: Float + Primitive {}
Expand All @@ -78,13 +82,14 @@ where
fn filter_map(value: T) -> Option<T> {
if value.is_nan() {
None
}
else {
} else {
Some(value)
}
}
}

impl<T> Sealed for NotNanConstraint<T> where T: Float + Primitive {}

impl<T> Member<InfiniteSet> for NotNanConstraint<T> where T: Float + Primitive {}

impl<T> Member<RealSet> for NotNanConstraint<T> where T: Float + Primitive {}
Expand All @@ -107,11 +112,12 @@ where
fn filter_map(value: T) -> Option<T> {
if value.is_nan() || value.is_infinite() {
None
}
else {
} else {
Some(value)
}
}
}

impl<T> Sealed for FiniteConstraint<T> where T: Float + Primitive {}

impl<T> Member<RealSet> for FiniteConstraint<T> where T: Float + Primitive {}
13 changes: 5 additions & 8 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,7 @@ mod proxy;
use crate::cmp::IntrinsicOrd;
use crate::constraint::{FiniteConstraint, NotNanConstraint, UnitConstraint};

pub use crate::constraint::Constraint;
pub use crate::proxy::Proxy;

/// Floating-point representation with total ordering.
Expand Down Expand Up @@ -167,13 +168,11 @@ where

if self.is_nan() {
CANONICAL_NAN_BITS
}
else {
} else {
let (mantissa, exponent, sign) = self.integer_decode();
if mantissa == 0 {
CANONICAL_ZERO_BITS
}
else {
} else {
let exponent = u64::from(unsafe { mem::transmute::<i16, u16>(exponent) });
let sign = if sign > 0 { 1u64 } else { 0u64 };
(mantissa & MANTISSA_MASK)
Expand Down Expand Up @@ -252,8 +251,7 @@ impl Encoding for f32 {
let exponent: i16 = ((bits >> 23) & 0xff) as i16;
let mantissa = if exponent == 0 {
(bits & 0x7f_ffff) << 1
}
else {
} else {
(bits & 0x7f_ffff) | 0x80_0000
};
(mantissa as u64, exponent - (127 + 23), sign)
Expand Down Expand Up @@ -288,8 +286,7 @@ impl Encoding for f64 {
let exponent: i16 = ((bits >> 52) & 0x7ff) as i16;
let mantissa = if exponent == 0 {
(bits & 0xf_ffff_ffff_ffff) << 1
}
else {
} else {
(bits & 0xf_ffff_ffff_ffff) | 0x10_0000_0000_0000
};
(mantissa, exponent - (1023 + 52), sign)
Expand Down