Trait from_attr::ParseMeta

pub trait ParseMeta {
    // Required methods
    fn is_unit() -> bool;
    fn parse_meta(&mut self, meta: ParseNestedMeta<'_>) -> Result<()>;

    // Provided methods
    fn parse_attr(&mut self, attr: &Attribute) -> Result<()> { ... }
    fn parse_meta_list(&mut self, meta_list: &MetaList) -> Result<()> { ... }
    fn parse_tokens(&mut self, tokens: TokenStream) -> Result<()> { ... }
}

Used to enable parsing of each meta.

Generally an helper struct is generated from the derive macro FromAttr, and an implementation of the ParseMeta trait is generated on this struct.

Required Methods

fn is_unit() -> bool

Whether the type is unit type.

fn parse_meta(&mut self, meta: ParseNestedMeta<'_>) -> Result<()>

Parse one meta.

Provided Methods

fn parse_attr(&mut self, attr: &Attribute) -> Result<()>

Parse one Attribute.

fn parse_meta_list(&mut self, meta_list: &MetaList) -> Result<()>

Parse one MetaList.

fn parse_tokens(&mut self, tokens: TokenStream) -> Result<()>

Parse one TokenStream.

Object Safety

This trait is not object safe.

Implementors