Trait FromMeta

pub trait FromMeta: Sized {
    // Required method
    fn from(meta: Option<Meta>) -> Result<Self>;
}

a trait for extracting a value from Option<syn::Meta>

Required Methods

fn from(meta: Option<Meta>) -> Result<Self>

extract the value

Errors

may return an Error if the meta 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", so this trait is not object safe.

Implementations on Foreign Types

impl FromMeta for Option<()>

fn from(meta: Option<Meta>) -> Result<Self>

impl FromMeta for Option<Vec<Ident>>

fn from(meta: Option<Meta>) -> Result<Self>

impl FromMeta for Vec<Ident>

fn from(meta: Option<Meta>) -> Result<Self>

Implementors

impl<F: FromLit> FromMeta for F