Enum syn::Fields

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

This is supported on crate features full or derive only.

Data stored within an enum variant or struct.

This type is available only if Syn is built with the "derive" or "full" feature.

Syntax tree enum

This type is a syntax tree enum.

Variants

Named(FieldsNamed)

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

Unnamed(FieldsUnnamed)

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

Unit

Unit struct or unit variant such as None.

Implementations

impl Fields

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.

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.

pub fn len(&self) -> usize

Returns the number of fields.

pub fn is_empty(&self) -> bool

Returns true if there are zero fields.

Trait Implementations

impl Clone for Fields

This is supported on crate feature clone-impls only.

pub fn clone(&self) -> Self

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Fields

This is supported on crate feature extra-traits only.

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

Formats the value using the given formatter.

impl Eq for Fields

This is supported on crate feature extra-traits only.

impl From<FieldsNamed> for Fields

pub fn from(e: FieldsNamed) -> Fields

Performs the conversion.

impl From<FieldsUnnamed> for Fields

pub fn from(e: FieldsUnnamed) -> Fields

Performs the conversion.

impl Hash for Fields

This is supported on crate feature extra-traits only.

pub fn hash<H>(&self, state: &mut H) where
    H: Hasher, 

Feeds this value into the given Hasher.

pub fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl IntoIterator for Fields

type Item = Field

The type of the elements being iterated over.

type IntoIter = IntoIter<Field>

Which kind of iterator are we turning this into?

pub fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<'a> IntoIterator for &'a Fields

type Item = &'a Field

The type of the elements being iterated over.

type IntoIter = Iter<'a, Field>

Which kind of iterator are we turning this into?

pub fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<'a> IntoIterator for &'a mut Fields

type Item = &'a mut Field

The type of the elements being iterated over.

type IntoIter = IterMut<'a, Field>

Which kind of iterator are we turning this into?

pub fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl PartialEq<Fields> for Fields

This is supported on crate feature extra-traits only.

pub fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

#[must_use]pub fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl ToTokens for Fields

This is supported on crate feature printing only.

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

Write self to the given TokenStream.

pub fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object.

pub fn into_token_stream(self) -> TokenStream

Convert self directly into a TokenStream object.