Enum ArgValue 

pub enum ArgValue {
    Literal(Lit),
    Type(Type),
    Expr(Expr),
    None,
}

Value for attribute or attribute argument, i.e. for #[attr = value] and #[attr(arg = value)] this is the value part of the attribute. Can be either a single literal or a single valid rust type name

Variants

Literal(Lit)

Attribute value represented by a literal

Type(Type)

Attribute value represented by a type name

Expr(Expr)

Attribute value represented by an expression

None

No value is given

Implementations

impl ArgValue

pub fn into_literal_value(self) -> Result<Lit, Error>

Converts into literal value for ArgValue::Literal variant or fails with Error::ArgValueMustBeLiteral otherwise

pub fn into_type_value(self) -> Result<Type, Error>

Converts into type value for ArgValue::Type variant or fails with Error::ArgValueMustBeType otherwise

pub fn into_type_expr(self) -> Result<Expr, Error>

Converts into type value for ArgValue::Expr variant or fails with Error::ArgValueMustBeExpr otherwise

pub fn to_literal_value(&self) -> Result<Lit, Error>

Constructs literal value for ArgValue::Literal variant or fails with Error::ArgValueMustBeLiteral otherwise

pub fn to_type_value(&self) -> Result<Type, Error>

Constructs type value for ArgValue::Type variant or fails with Error::ArgValueMustBeType otherwise

pub fn to_type_expr(&self) -> Result<Expr, Error>

Constructs type value for ArgValue::Expr variant or fails with Error::ArgValueMustBeExpr otherwise

pub fn as_literal_value(&self) -> Option<&Lit>

Returns a reference to a literal value for ArgValue::Literal variant, or None otherwise.

pub fn as_type_value(&self) -> Option<&Type>

Returns a reference to a literal value for ArgValue::Type variant, or None otherwise.

pub fn as_type_expr(&self) -> Option<&Expr>

Returns a reference to a literal value for ArgValue::Expr variant, or None otherwise.

pub fn is_none(&self) -> bool

Tests whether the self is set to ArgValue::None

pub fn is_some(&self) -> bool

Tests whether the self is not set to ArgValue::None

pub fn value_class(&self) -> Option<ValueClass>

Returns ValueClass for the current value, if any

Trait Implementations

impl Clone for ArgValue

fn clone(&self) -> ArgValue

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ArgValue

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

Formats the value using the given formatter.

impl From<&[u8]> for ArgValue

fn from(val: &[u8]) -> Self

Converts to this type from the input type.

impl From<&str> for ArgValue

fn from(val: &str) -> Self

Converts to this type from the input type.

impl From<Ident> for ArgValue

fn from(ident: Ident) -> Self

Converts to this type from the input type.

impl From<Option<LitBool>> for ArgValue

fn from(val: Option<LitBool>) -> Self

Converts to this type from the input type.

impl From<Option<LitByteStr>> for ArgValue

fn from(val: Option<LitByteStr>) -> Self

Converts to this type from the input type.

impl From<Option<LitChar>> for ArgValue

fn from(val: Option<LitChar>) -> Self

Converts to this type from the input type.

impl From<Option<LitFloat>> for ArgValue

fn from(val: Option<LitFloat>) -> Self

Converts to this type from the input type.

impl From<Option<LitInt>> for ArgValue

fn from(val: Option<LitInt>) -> Self

Converts to this type from the input type.

impl From<Option<LitStr>> for ArgValue

fn from(val: Option<LitStr>) -> Self

Converts to this type from the input type.

impl From<Path> for ArgValue

fn from(path: Path) -> Self

Converts to this type from the input type.

impl From<String> for ArgValue

fn from(val: String) -> Self

Converts to this type from the input type.

impl From<Vec<u8>> for ArgValue

fn from(val: Vec<u8>) -> Self

Converts to this type from the input type.

impl From<bool> for ArgValue

fn from(val: bool) -> Self

Converts to this type from the input type.

impl From<char> for ArgValue

fn from(val: char) -> Self

Converts to this type from the input type.

impl From<f64> for ArgValue

fn from(val: f64) -> Self

Converts to this type from the input type.

impl From<isize> for ArgValue

fn from(val: isize) -> Self

Converts to this type from the input type.

impl From<usize> for ArgValue

fn from(val: usize) -> Self

Converts to this type from the input type.

impl Parse for ArgValue

fn parse(input: &ParseBuffer<'_>) -> Result<Self>

impl ToTokens for ArgValue

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.

impl TryFrom<ArgValue> for Expr

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Ident

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for LitBool

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for LitByteStr

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for LitChar

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for LitFloat

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for LitInt

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for LitStr

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<Expr>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<Ident>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<LitBool>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<LitByteStr>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<LitChar>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<LitFloat>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<LitInt>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<LitStr>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<Path>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Path

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for String

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Vec<u8>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for bool

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for char

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 264 bytes

Size for each variant:

• Literal: 32 bytes
• Type: 264 bytes
• Expr: 256 bytes
• None: 0 bytes