Enum FieldKey 

pub enum FieldKey {
    Named(Ident),
    Index(Index),
}

Identifies a struct field by name or position.

Construct from a syn::Ident, syn::Index, &str, or usize. Implements ToTokens and Display for use in generated code and error messages.

Examples

use zyn::ext::FieldKey;

let named = "id".into();
let indexed = 0usize.into();

assert!(named.is_named());
assert!(indexed.is_index());

Variants

Named(Ident)

A named field identified by its syn::Ident.

Index(Index)

A positional field identified by its syn::Index.

Implementations

impl FieldKey

pub fn is_named(&self) -> bool

Returns true if this key refers to a named field.

pub fn is_index(&self) -> bool

Returns true if this key refers to a positional field.

pub fn as_named(&self) -> Option<&Ident>

Returns the identifier if this is a named key.

pub fn as_index(&self) -> Option<&Index>

Returns the index if this is a positional key.

Trait Implementations

impl Display for FieldKey

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

Formats the value using the given formatter.

impl From<&str> for FieldKey

fn from(name: &str) -> Self

Converts to this type from the input type.

impl From<Ident> for FieldKey

fn from(ident: Ident) -> Self

Converts to this type from the input type.

impl From<Index> for FieldKey

fn from(index: Index) -> Self

Converts to this type from the input type.

impl From<usize> for FieldKey

fn from(index: usize) -> Self

Converts to this type from the input type.

impl ToTokens for FieldKey

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

Write self to the given TokenStream.

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object.

fn into_token_stream(self) -> TokenStream

where Self: Sized,

Convert self directly into a TokenStream object.