Trait ItemAttrExt 

pub trait ItemAttrExt: ItemLike {
    // Provided method
    fn try_split_attr_mut<F, R>(&mut self, f: F) -> Result<R>
       where F: FnOnce(&mut Vec<Attribute>, &mut Self) -> Result<R> { ... }
}

Extension for syn::*Item::attrs using crate::ext::ItemLike

Provided Methods

fn try_split_attr_mut<F, R>(&mut self, f: F) -> Result<R>

where F: FnOnce(&mut Vec<Attribute>, &mut Self) -> Result<R>,

Takes a closure and calls it with separated attrs and item, as both mutable references.

1. Try to get attrs; Otherwise Err
2. Split attrs from self with std::mem::replace
3. Call the closure f
4. Merge attrs into self

Note: During the closure call, attrs in self is always an empty. Always access attrs with given closure parameter.

Panics

Panics if replaced attrs in self is not empty at merge step.

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 ItemAttrExt for ImplItem

impl ItemAttrExt for Item

impl ItemAttrExt for TraitItem

Implementors