Struct ItemSetSelector 

pub struct ItemSetSelector<Field>(/* private fields */);

Available on crate feature parse2 only.

Helper type that allows us to select an impl of ItemSetMethods

For use by macros.

See the module-level docs, and Field type in NetdocParseable.

Example

The code in the (derive) macro output is roughly like this:

use tor_netdoc::parse2::multiplicity::{ItemSetSelector, ItemSetMethods as _};

let selector = ItemSetSelector::<Vec<i32>>::default();
let mut accum = None;
selector.accumulate(&mut accum, 12).unwrap();
let out = selector.finish(accum, "item-set").unwrap();

assert_eq!(out, [12]);

Trait Implementations

impl<Field> Clone for ItemSetSelector<Field>

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, _source: &Self)

Performs copy-assignment from source.

impl<Field> Default for ItemSetSelector<Field>

fn default() -> Self

Returns the “default value” for a type.

impl<T> ItemSetMethods for &ItemSetSelector<T>

type Each = T

The value for each Item.

type Field = T

The output type: the type of the field in the netdoc struct.

fn accumulate(self, acc: &mut Option<T>, item: T) -> Result<(), EP>

Accumulate one value into the accumulator.

fn finish(self, acc: Option<T>, keyword: &'static str) -> Result<T, EP>

Resolve the accumulator into the output.

fn is_intro_item_keyword(self, kw: KeywordRef<'_>) -> bool

where Self::Each: NetdocParseable,

If the contained type is a sub-document, call its is_intro_item_keyword.

fn finish_subdoc(self, acc: Option<Self::Field>) -> Result<Self::Field, EP>

where Self::Each: NetdocParseable,

finish for if the contained type is a wsub-document

impl<T> ItemSetMethods for ItemSetSelector<Option<T>>

type Each = T

The value for each Item.

type Field = Option<T>

The output type: the type of the field in the netdoc struct.

fn accumulate(self, acc: &mut Option<Option<T>>, item: T) -> Result<(), EP>

Accumulate one value into the accumulator.

fn finish( self, acc: Option<Option<T>>, _keyword: &'static str, ) -> Result<Option<T>, EP>

Resolve the accumulator into the output.

fn is_intro_item_keyword(self, kw: KeywordRef<'_>) -> bool

where Self::Each: NetdocParseable,

If the contained type is a sub-document, call its is_intro_item_keyword.

fn finish_subdoc(self, acc: Option<Self::Field>) -> Result<Self::Field, EP>

where Self::Each: NetdocParseable,

finish for if the contained type is a wsub-document

impl<T> ItemSetMethods for ItemSetSelector<Vec<T>>

type Each = T

The value for each Item.

type Field = Vec<T>

The output type: the type of the field in the netdoc struct.

fn accumulate(self, acc: &mut Option<Vec<T>>, item: T) -> Result<(), EP>

Accumulate one value into the accumulator.

fn finish( self, acc: Option<Vec<T>>, _keyword: &'static str, ) -> Result<Vec<T>, EP>

Resolve the accumulator into the output.

fn is_intro_item_keyword(self, kw: KeywordRef<'_>) -> bool

where Self::Each: NetdocParseable,

If the contained type is a sub-document, call its is_intro_item_keyword.

fn finish_subdoc(self, acc: Option<Self::Field>) -> Result<Self::Field, EP>

where Self::Each: NetdocParseable,

finish for if the contained type is a wsub-document

impl<Field> Copy for ItemSetSelector<Field>