Enum syn::Fields

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pub enum Fields {
    Named(FieldsNamed),
    Unnamed(FieldsUnnamed),
    Unit,
}
Expand description

Data stored within an enum variant or struct.

§Syntax tree enum

This type is a syntax tree enum.

Variants§

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Named(FieldsNamed)

Named fields of a struct or struct variant such as Point { x: f64, y: f64 }.

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Unnamed(FieldsUnnamed)

Unnamed fields of a tuple struct or tuple variant such as Some(T).

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Unit

Unit struct or unit variant such as None.

Implementations§

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impl Fields

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pub fn iter(&self) -> Iter<'_, Field>

Get an iterator over the borrowed Field items in this object. This iterator can be used to iterate over a named or unnamed struct or variant’s fields uniformly.

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pub fn iter_mut(&mut self) -> IterMut<'_, Field>

Get an iterator over the mutably borrowed Field items in this object. This iterator can be used to iterate over a named or unnamed struct or variant’s fields uniformly.

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pub fn len(&self) -> usize

Returns the number of fields.

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pub fn is_empty(&self) -> bool

Returns true if there are zero fields.

Trait Implementations§

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impl Clone for Fields

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fn clone(&self) -> Self

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 From<FieldsNamed> for Fields

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fn from(e: FieldsNamed) -> Fields

Converts to this type from the input type.
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impl From<FieldsUnnamed> for Fields

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fn from(e: FieldsUnnamed) -> Fields

Converts to this type from the input type.
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impl<'a> IntoIterator for &'a Fields

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type Item = &'a Field

The type of the elements being iterated over.
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type IntoIter = Iter<'a, Field>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value. Read more
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impl<'a> IntoIterator for &'a mut Fields

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type Item = &'a mut Field

The type of the elements being iterated over.
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type IntoIter = IterMut<'a, Field>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value. Read more
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impl IntoIterator for Fields

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type Item = Field

The type of the elements being iterated over.
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type IntoIter = IntoIter<Field>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value. Read more
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impl ToTokens for Fields

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fn to_tokens(&self, tokens: &mut TokenStream)

Write self to the given TokenStream. Read more
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fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object. Read more
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fn into_token_stream(self) -> TokenStream
where Self: Sized,

Convert self directly into a TokenStream object. Read more

Auto Trait Implementations§

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impl Freeze for Fields

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impl RefUnwindSafe for Fields

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impl !Send for Fields

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impl !Sync for Fields

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impl Unpin for Fields

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impl UnwindSafe for Fields

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<U> 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> Spanned for T
where T: Spanned + ?Sized,

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fn span(&self) -> Span

Returns a Span covering the complete contents of this syntax tree node, or Span::call_site() if this node is empty.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.