Struct ExternalType 

pub struct ExternalType { /* private fields */ }

A codec template for an external Rust type.

Templates are built once at registration time; type arguments are filled in per use site via CodecExpr::Param placeholders.

Implementations

impl ExternalType

pub fn leaf(expr: CodecExpr) -> Self

A type with no type parameters (e.g. uuid::Uuid).

pub fn generic1(build: impl FnOnce(CodecExpr) -> CodecExpr) -> Self

A type with one type parameter. The closure runs once with Param(0) to build the template.

pub fn generic2(build: impl FnOnce(CodecExpr, CodecExpr) -> CodecExpr) -> Self

A type with two type parameters. The closure runs once with Param(0) and Param(1).

pub fn generic( arity: usize, build: impl FnOnce(&[CodecExpr]) -> CodecExpr, ) -> Self

A type with arity type parameters. The closure runs once with [Param(0), ..., Param(arity - 1)].

Panics

Panics if the produced template references a Param index >= arity.

pub fn allow_trailing_args(self) -> Self

Accept (and ignore) extra trailing type arguments beyond the declared arity. e.g. the hasher parameter of HashMap<K, V, S>.

Trait Implementations

impl Clone for ExternalType

fn clone(&self) -> ExternalType

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExternalType

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

Formats the value using the given formatter.