[−][src]Enum macro_input::DefaultValue
a default value for a Def
Variants
any literal
a flag that doesn't have a value eg #[my_input(enabled)]
a string
a string
ByteStr(Option<&'static [u8]>)
a bytestring
a bytestring
a u8
a char
a i32
a f32
a bool
a list of idents (default not supported)
Implementations
impl DefaultValue
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pub fn from_lit(ty: Type, lit: Option<Lit>) -> Result<DefaultValue, Error>
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construct a DefaultValue
from a type and a literal
Errors
may return an error if the literal is not compatible with the type
#[must_use]pub fn ty(&self, optional: bool) -> Type
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get the type of the value
#[must_use]pub fn has_default_data(&self) -> bool
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checks whether the value is a default value
Trait Implementations
impl Clone for DefaultValue
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pub fn clone(&self) -> DefaultValue
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pub fn clone_from(&mut self, source: &Self)
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impl<'_> From<&'_ DefaultValue> for Types
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pub fn from(value: &DefaultValue) -> Types
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impl ToTokens for DefaultValue
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pub fn to_tokens(&self, tokens: &mut TokenStream)
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pub fn to_token_stream(&self) -> TokenStream
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pub fn into_token_stream(self) -> TokenStream
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Auto Trait Implementations
impl RefUnwindSafe for DefaultValue
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impl !Send for DefaultValue
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impl !Sync for DefaultValue
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impl Unpin for DefaultValue
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impl UnwindSafe for DefaultValue
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Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> Spanned for T where
T: Spanned + ?Sized,
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T: Spanned + ?Sized,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,