halo2_base::safe_types

Struct SafeType

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pub struct SafeType<F: ScalarField, const BYTES_PER_ELE: usize, const TOTAL_BITS: usize> { /* private fields */ }
Expand description

SafeType’s goal is to avoid out-of-range undefined behavior. When building circuits, it’s common to use multiple AssignedValue<F>s to represent a logical variable. For example, we might want to represent a hash with 32 AssignedValue<F> where each AssignedValue represents 1 byte. However, the range of AssignedValue<F> is much larger than 1 byte(0~255). If a circuit takes 32 AssignedValue<F> as inputs and some of them are actually greater than 255, there could be some undefined behaviors. SafeType gurantees the value range of its owned AssignedValue<F>. So circuits don’t need to do any extra value checking if they take SafeType as inputs.

  • TOTAL_BITS is the number of total bits of this type.
  • BYTES_PER_ELE is the number of bytes of each element.

Implementations§

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impl<F: ScalarField, const BYTES_PER_ELE: usize, const TOTAL_BITS: usize> SafeType<F, BYTES_PER_ELE, TOTAL_BITS>

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pub const BYTES_PER_ELE: usize = BYTES_PER_ELE

Number of bytes of each element.

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pub const TOTAL_BITS: usize = TOTAL_BITS

Total bits of this type.

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pub const VALUE_LENGTH: usize = _

Number of elements of this type.

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pub fn bits_per_ele() -> usize

Number of bits of each element.

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pub fn value(&self) -> &[AssignedValue<F>]

Return values in little-endian.

Trait Implementations§

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impl<F: ScalarField, const BYTES_PER_ELE: usize, const TOTAL_BITS: usize> AsRef<[AssignedValue<F>]> for SafeType<F, BYTES_PER_ELE, TOTAL_BITS>

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fn as_ref(&self) -> &[AssignedValue<F>]

Converts this type into a shared reference of the (usually inferred) input type.
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impl<F: Clone + ScalarField, const BYTES_PER_ELE: usize, const TOTAL_BITS: usize> Clone for SafeType<F, BYTES_PER_ELE, TOTAL_BITS>

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fn clone(&self) -> SafeType<F, BYTES_PER_ELE, TOTAL_BITS>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<F: Debug + ScalarField, const BYTES_PER_ELE: usize, const TOTAL_BITS: usize> Debug for SafeType<F, BYTES_PER_ELE, TOTAL_BITS>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<F: ScalarField, const TOTAL_BITS: usize> From<FixLenBytes<F, { SafeType::<F, 1, TOTAL_BITS>::VALUE_LENGTH }>> for SafeType<F, 1, TOTAL_BITS>

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fn from( bytes: FixLenBytes<F, { SafeType<F, 1, TOTAL_BITS>::VALUE_LENGTH }>, ) -> Self

Converts to this type from the input type.
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impl<F: ScalarField, const TOTAL_BITS: usize> From<SafeType<F, 1, TOTAL_BITS>> for FixLenBytes<F, { SafeType<F, 1, TOTAL_BITS>::VALUE_LENGTH }>

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fn from(bytes: SafeType<F, 1, TOTAL_BITS>) -> Self

Converts to this type from the input type.
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impl<F: ScalarField, const TOTAL_BITS: usize> TryFrom<Vec<SafeByte<F>>> for SafeType<F, 1, TOTAL_BITS>

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type Error = String

The type returned in the event of a conversion error.
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fn try_from(value: Vec<SafeByte<F>>) -> Result<Self, Self::Error>

Performs the conversion.

Auto Trait Implementations§

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impl<F, const BYTES_PER_ELE: usize, const TOTAL_BITS: usize> Freeze for SafeType<F, BYTES_PER_ELE, TOTAL_BITS>

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impl<F, const BYTES_PER_ELE: usize, const TOTAL_BITS: usize> RefUnwindSafe for SafeType<F, BYTES_PER_ELE, TOTAL_BITS>
where F: RefUnwindSafe,

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impl<F, const BYTES_PER_ELE: usize, const TOTAL_BITS: usize> Send for SafeType<F, BYTES_PER_ELE, TOTAL_BITS>

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impl<F, const BYTES_PER_ELE: usize, const TOTAL_BITS: usize> Sync for SafeType<F, BYTES_PER_ELE, TOTAL_BITS>

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impl<F, const BYTES_PER_ELE: usize, const TOTAL_BITS: usize> Unpin for SafeType<F, BYTES_PER_ELE, TOTAL_BITS>
where F: Unpin,

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impl<F, const BYTES_PER_ELE: usize, const TOTAL_BITS: usize> UnwindSafe for SafeType<F, BYTES_PER_ELE, TOTAL_BITS>
where F: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<A, T> AsBits<T> for A
where A: AsRef<[T]>, T: BitStore,

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fn as_bits<O>(&self) -> &BitSlice<T, O> ⓘ
where O: BitOrder,

Views self as an immutable bit-slice region with the O ordering.
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fn try_as_bits<O>(&self) -> Result<&BitSlice<T, O>, BitSpanError<T>>
where O: BitOrder,

Attempts to view self as an immutable bit-slice region with the O ordering. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> Conv for T

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fn conv<T>(self) -> T
where Self: Into<T>,

Converts self into T using Into<T>. Read more
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impl<T> FmtForward for T

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fn fmt_binary(self) -> FmtBinary<Self>
where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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fn fmt_display(self) -> FmtDisplay<Self>
where Self: Display,

Causes self to use its Display implementation when Debug-formatted.
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fn fmt_lower_exp(self) -> FmtLowerExp<Self>
where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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fn fmt_lower_hex(self) -> FmtLowerHex<Self>
where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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fn fmt_octal(self) -> FmtOctal<Self>
where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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fn fmt_pointer(self) -> FmtPointer<Self>
where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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fn fmt_upper_exp(self) -> FmtUpperExp<Self>
where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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fn fmt_list(self) -> FmtList<Self>
where &'a Self: for<'a> IntoIterator,

Formats each item in a sequence. Read more
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fn from(t: T) -> T

Returns the argument unchanged.

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Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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where U: From<T>,

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Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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where T: ?Sized,

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fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> R
where Self: Sized,

Pipes by value. This is generally the method you want to use. Read more
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where R: 'a,

Borrows self and passes that borrow into the pipe function. Read more
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where R: 'a,

Mutably borrows self and passes that borrow into the pipe function. Read more
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fn pipe_borrow<'a, B, R>(&'a self, func: impl FnOnce(&'a B) -> R) -> R
where Self: Borrow<B>, B: 'a + ?Sized, R: 'a,

Borrows self, then passes self.borrow() into the pipe function. Read more
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where Self: BorrowMut<B>, B: 'a + ?Sized, R: 'a,

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where Self: AsRef<U>, U: 'a + ?Sized, R: 'a,

Borrows self, then passes self.as_ref() into the pipe function.
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where Self: AsMut<U>, U: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.as_mut() into the pipe function.
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where Self: Deref<Target = T>, T: 'a + ?Sized, R: 'a,

Borrows self, then passes self.deref() into the pipe function.
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where Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.deref_mut() into the pipe function.
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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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type Output = T

Should always be Self
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fn tap(self, func: impl FnOnce(&Self)) -> Self

Immutable access to a value. Read more
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Mutable access to a value. Read more
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Performs the conversion.
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