Struct BorrowedCow 

pub struct BorrowedCow;

A proxy type that enables borrowing from the document when parsing Cow<'doc, T>.

Unlike the default Cow<'static, T> implementation which always returns Cow::Owned, this proxy returns Cow::Borrowed by parsing &'doc T directly from the document.

Example

use eure_macros::FromEure;
use std::borrow::Cow;

#[derive(FromEure)]
struct Data<'doc> {
    #[eure(via = "eure_document::proxy::BorrowedCow")]
    name: Cow<'doc, str>,
}

Trait Implementations

impl<'doc, T> FromEure<'doc, Cow<'doc, T>> for BorrowedCow

where T: ToOwned + ?Sized, for<'a> &'a T: FromEure<'a>, for<'a> <&'a T as FromEure<'a>>::Error: Into<ParseError>,

type Error = ParseError

The error type returned by parsing.

fn parse(ctx: &ParseContext<'doc>) -> Result<Cow<'doc, T>, Self::Error>

Parse a value of type T from the given parse context.

impl<'a, T> IntoEure<Cow<'a, T>> for BorrowedCow

where T: ToOwned + ?Sized, T::Owned: IntoEure,

type Error = <<T as ToOwned>::Owned as IntoEure>::Error

The error type returned when writing.

fn write( value: Cow<'a, T>, c: &mut DocumentConstructor, ) -> Result<(), Self::Error>

Write a value to the current node in the document constructor.

fn write_flatten( value: T, rec: &mut RecordWriter<'_>, ) -> Result<(), Self::Error>

Write a value as flattened record fields.