Enum lsp_msg_internal::Elective

pub enum Elective<T> {
    Absent,
    Present(T),
}

Represents an optional field of an LSP object.

Is useful where an absent field represents functionality different from the default functionality of the field.

Specifications

SPEC-Elective-serde

Elective shall implement the Deserialize and Serialize traits to differentiate between an absent field and a present field.

use lsp_msg_internal::Elective;
use serde_test::{assert_tokens, Token};
assert_tokens(&Elective::<u8>::Absent, &[Token::Unit]);
assert_tokens(&Elective::Present(0_u8), &[Token::U8(0)]);

Variants

Absent

Indicates a missing field.

Present(T)

Indicates a present field.

Methods

impl<T> Elective<T>

Specifications

SPEC-Elective-absent

Elective shall implement the functionality to check if an instance is absent.

use lsp_msg_internal::Elective;
assert!(Elective::<u8>::Absent.is_absent());
assert!(!Elective::Present(0).is_absent());

pub fn is_absent(&self) -> bool

If the Elective is absent.

Trait Implementations

impl<T: PartialEq> PartialEq<Elective<T>> for Elective<T>

fn eq(&self, other: &Elective<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Elective<T>) -> bool

This method tests for !=.

impl<T> Default for Elective<T>

Specifications

SPEC-Elective-default

Elective shall implement the Default trait to return an absent field.

use lsp_msg_internal::Elective;
assert!(Elective::<u8>::default().is_absent())

fn default() -> Self

Returns the "default value" for a type.

impl<T: Debug> Debug for Elective<T>

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

Formats the value using the given formatter.

impl<T> Serialize for Elective<T> where
    T: Serialize, 

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where
    __S: Serializer, 

Serialize this value into the given Serde serializer.

impl<'de, T> Deserialize<'de> for Elective<T> where
    T: Deserialize<'de>, 

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
    __D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.