Enum CoercionMapping

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pub(crate) enum CoercionMapping {
    Numeric,
    Bool,
    BoolVec,
    NativeInt,
    NativeIntVec,
    NativeReal,
    NativeRealVec,
}

Expand description

Conversion selected by coerce, shared by Rust conversion and R checks.

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Numeric

Numeric scalars and vectors already have checked, multi-source converters.

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Bool

Keep logical scalars and additionally accept integer zero or one.

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BoolVec

Keep logical vectors and additionally accept integer zeros and ones.

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NativeInt

Native i32: keep INTSXP, additionally accept whole-valued doubles, logicals, and raws.

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NativeIntVec

Native Vec<i32>: element-wise form of Self::NativeInt.

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NativeReal

Native f64: keep REALSXP, additionally accept integers, logicals, and raws.

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NativeRealVec

Native Vec<f64>: element-wise form of Self::NativeReal.

Implementations§

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impl CoercionMapping

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pub(crate) fn from_type(ty: &Type) -> Option<Self>

Recognize the scalar and vector types supported by coerce.

Numeric conversion preserves all sources accepted by TryFromSexp: integer, double, logical, and raw. Booleans extend their logical-only converter with integer zero/one input. The native i32 / f64 scalars and vectors, whose bare conversion accepts one SEXPTYPE, widen to the same four sources (whole-valued doubles only for i32). Borrowed slices and other types keep TryFromSexp.

Auto Trait Implementations§

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impl UnwindSafe for CoercionMapping

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<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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impl<T> BorrowMut<T> for T
where T: ?Sized,

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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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> SizeHint for T
where T: ?Sized,

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default fn lower_bound(&self) -> usize

🔬This is a nightly-only experimental API. (core_io_internals)

Returns a lower bound on the number of elements this container-like item contains. For example, an array [u8; 12] could return any value between 0 and 12 inclusively as a correct implementation. Read more

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default fn upper_bound(&self) -> Option<usize>

🔬This is a nightly-only experimental API. (core_io_internals)

Returns an upper bound on the number of elements this container-like item contains if it can be determined, otherwise None. Read more

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final fn size_hint(&self) -> (usize, Option<usize>)

🔬This is a nightly-only experimental API. (core_io_internals)

Returns an estimate for the number of elements this container like type contains. Read more

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