Trait macro_input::FromMeta

pub trait FromMeta {
    pub fn from(meta: Option<Meta>) -> Result<Self, Error>;
}

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

Required methods

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

extract the value

Errors

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

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Implementations on Foreign Types

impl FromMeta for Option<Vec<Ident, Global>>

pub fn from(meta: Option<Meta>) -> Result<Option<Vec<Ident, Global>>, Error>

impl FromMeta for Vec<Ident, Global>

pub fn from(meta: Option<Meta>) -> Result<Vec<Ident, Global>, Error>

impl FromMeta for Option<()>

pub fn from(meta: Option<Meta>) -> Result<Option<()>, Error>

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Implementors

impl<F> FromMeta for F where
    F: FromLit, 

pub fn from(meta: Option<Meta>) -> Result<F, Error>

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