miniextendr_macros::rust_conversion_builder

Enum Expected

pub(crate) enum Expected<'a> {
    Literal(&'a str),
    RunTime(&'a TokenStream),
    FromError(Option<&'a TokenStream>),
}

Expand description

Where the <expected> of a conversion failure’s '' must be <expected> comes from.

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Literal(&'a str)

The macro knows it: the whole prefix, '' must be <expected>.

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RunTime(&'a TokenStream)

An expression the macro wrote yields it on the failure path (the choices of a match_arg type): the prefix is '' must be <it>.

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FromError(Option<&'a TokenStream>)

What the type declares, when an expression for it is given (declared_expectation), else what the error may know (__mx_conversion_expectation!), else the prefix is invalid '' argument.

Auto Trait Implementations§

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impl<'a> UnwindSafe for Expected<'a>

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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