Struct Expand 

pub struct Expand<W>(/* private fields */);

A field of codec W written in place, or as a reference the reader’s resolver expands into the value W reads. Without a resolver, or when it keeps the reference, W reads what was written (a field that is itself a reference — RefTo — reads it as one).

Writing, the binary form and frames carry the value, never the reference: expansion is a read-time step of a tool that has a resolver (from_value_with, from_doc_with, from_bytes_with). A problem with the expanded value is reported at the reference’s path.

Trait Implementations

impl<W: Debug> Debug for Expand<W>

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

Formats the value using the given formatter.

impl<F, W: With<F>> With<F> for Expand<W>

fn shape() -> Shape

The field’s shape.

fn read(v: &ValueRef<'_>, cx: &mut Reader<'_>) -> Option<F>

Reads the field.

fn write(f: &F) -> Value

Writes the field.

fn absent() -> Option<F>

The field’s value when it isn’t there (None: it’s required).

fn skip(f: &F) -> bool

Whether a struct leaves the field out.

fn encode(f: &F, w: &mut Writer)

The field in the binary form, straight: its value encoded unless the codec knows better.

fn decode(d: &mut Decoder<'_>) -> Option<F>

The field from the binary form, straight; None sends the read the slow way (see Schema::decode).

fn pack(f: &F, p: &mut Packer)

The field packed into a frame: its binary form as bytes unless the codec knows better.

fn unpack(u: &mut Unpacker<'_>) -> Option<F>

The field out of a frame.