Enum DefaultValue 

pub enum DefaultValue {
    Any(Option<Lit>),
    Flag,
    Str(Option<&'static str>),
    String(Option<String>),
    ByteStr(Option<&'static [u8]>),
    ByteString(Option<Vec<u8>>),
    Byte(Option<u8>),
    Char(Option<char>),
    I32(Option<i32>),
    F32(Option<f32>),
    Bool(Option<bool>),
    Idents,
}

a default value for a Def

Variants

Any(Option<Lit>)

any literal

Flag

a flag that doesn’t have a value eg #[my_input(enabled)]

Str(Option<&'static str>)

a string

String(Option<String>)

a string

ByteStr(Option<&'static [u8]>)

a bytestring

ByteString(Option<Vec<u8>>)

a bytestring

Byte(Option<u8>)

a u8

Char(Option<char>)

a char

I32(Option<i32>)

a i32

F32(Option<f32>)

a f32

Bool(Option<bool>)

a bool

Idents

a list of idents (default not supported)

Implementations

impl DefaultValue

pub fn from_lit(ty: Type, lit: Option<Lit>) -> Result<DefaultValue>

construct a DefaultValue from a type and a literal

Errors

may return an error if the literal is not compatible with the type

pub fn ty(&self, optional: bool) -> Type

get the type of the value

pub fn has_default_data(&self) -> bool

checks whether the value is a default value

Trait Implementations

impl Clone for DefaultValue

fn clone(&self) -> DefaultValue

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl From<&DefaultValue> for Types

fn from(value: &DefaultValue) -> Self

Converts to this type from the input type.

impl From<DefaultValue> for Option<Lit>

fn from(val: DefaultValue) -> Self

Converts to this type from the input type.

impl ToTokens for DefaultValue

fn to_tokens(&self, tokens: &mut TokenStream)

Write self to the given TokenStream.

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object.

fn into_token_stream(self) -> TokenStream

where Self: Sized,

Convert self directly into a TokenStream object.