Trait macro_input::FromLit

pub trait FromLit {
    pub fn from(lit: Option<Lit>) -> Result<Self, Error>;
}

a trait for extracting a value from a literal

FromMeta is automatically implemented for all implementations

Required methods

pub fn from(lit: Option<Lit>) -> Result<Self, Error>

extract the value

Errors

may return an Error if the literal doesn't contain the correct value

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Implementations on Foreign Types

impl<V> FromLit for Option<V> where
    V: FromLit, 

pub fn from(lit: Option<Lit>) -> Result<Option<V>, Error>

impl FromLit for Option<Lit>

pub fn from(lit: Option<Lit>) -> Result<Option<Lit>, Error>

impl FromLit for i32

pub fn from(lit: Option<Lit>) -> Result<i32, Error>

impl FromLit for u8

pub fn from(lit: Option<Lit>) -> Result<u8, Error>

impl FromLit for f32

pub fn from(lit: Option<Lit>) -> Result<f32, Error>

impl FromLit for char

pub fn from(lit: Option<Lit>) -> Result<char, Error>

impl FromLit for Vec<u8, Global>

pub fn from(lit: Option<Lit>) -> Result<Vec<u8, Global>, Error>

impl FromLit for String

pub fn from(lit: Option<Lit>) -> Result<String, Error>

impl FromLit for bool

pub fn from(lit: Option<Lit>) -> Result<bool, Error>

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Implementors

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