Struct Metapattern 

pub struct Metapattern {
    pub kind: Option<Kind>,
}

A pattern within the meta type system. In most cases, these can be thought of as representing a (context-sensitive) set of metavalues. In the special case where the set has only one metavalue in it, a pattern can also be evaluated to that metavalue. This allows patterns to be used at both the LHS and RHS of an assignment statement, for matching incoming metavalues or data types, and for deriving data types. Note however, that some binding patterns may evaluate to a value despite representing a non-unit set, or even evaluate to something not in the matched set.

Matching or evaluating patterns may have side effects in the form of names being bound to a metavalue or rebound to a different metavalue. Evaluation and matching is strictly done in left-to-right order unless otherwise specified.

Fields

kind: Option<Kind>

Trait Implementations

impl Clone for Metapattern

fn clone(&self) -> Metapattern

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Metapattern

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

Formats the value using the given formatter.

impl Default for Metapattern

fn default() -> Self

Returns the “default value” for a type.

impl InputNode for Metapattern

fn type_to_node() -> Node

Creates an empty output node for a protobuf datum of this type.

fn data_to_node(&self) -> Node

Creates an empty output node for a protobuf datum with this value.

fn oneof_variant(&self) -> Option<&'static str>

Returns the name of the selected variant of a oneof field, if this is a rust enum used to represent a oneof field.

fn parse_unknown(&self, y: &mut Context<'_>) -> bool

Complete the subtrees of this datum in output that have not already been parsed using UnknownField nodes. Returns whether any such nodes were added.

impl Message for Metapattern

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode(&self, buf: &mut impl BufMut) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message to a newly allocated buffer.

fn encode_length_delimited( &self, buf: &mut impl BufMut, ) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes a length-delimited instance of the message from the buffer.

fn merge(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl PartialEq for Metapattern

fn eq(&self, other: &Metapattern) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl ProtoMessage for Metapattern

fn proto_message_type() -> &'static str

Returns the protobuf type name for messages of this type.

impl StructuralPartialEq for Metapattern