Trait FromLit 

pub trait FromLit: Sized {
    // Required method
    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

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

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl FromLit for Option<Lit>

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

impl FromLit for String

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

impl FromLit for Vec<u8>

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

impl FromLit for bool

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

impl FromLit for char

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

impl FromLit for f32

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

impl FromLit for i32

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

impl FromLit for u8

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

impl<V> FromLit for Option<V>

where V: FromLit,

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

Implementors