Struct ProxyDef 

pub struct ProxyDef {
    pub shape: &'static Shape,
    pub convert_in: ProxyConvertInFn,
    pub convert_out: ProxyConvertOutFn,
}

Definition of a proxy type for custom serialization/deserialization.

A ProxyDef specifies how to convert between a target type and a proxy type. This can be used at both the container level (on a struct/enum) and the field level.

Container-level proxy

When applied to a struct or enum with #[facet(proxy = ProxyType)]:

• Serialization: target → proxy via convert_out
• Deserialization: proxy → target via convert_in

Field-level proxy

When applied to a field with #[facet(proxy = ProxyType)]:

• The field is serialized/deserialized through the proxy type
• Requires TryFrom<ProxyType> for FieldType and TryFrom<&FieldType> for ProxyType

Example (generated by derive macro)

ProxyDef {
    shape: <ProxyType as Facet>::SHAPE,
    convert_in: Self::__facet_proxy_convert_in,
    convert_out: Self::__facet_proxy_convert_out,
}

Fields

shape: &'static Shape

The shape of the proxy type.

convert_in: ProxyConvertInFn

Converts from proxy type to target type (deserialization).

Called when deserializing: first deserialize into proxy, then convert to target.

convert_out: ProxyConvertOutFn

Converts from target type to proxy type (serialization).

Called when serializing: convert target to proxy, then serialize proxy.

Trait Implementations

impl Clone for ProxyDef

fn clone(&self) -> ProxyDef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ProxyDef

Available on crate feature alloc only.

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

Formats the value using the given formatter.

impl Copy for ProxyDef