proc_macro_tool

Trait WalkExt

Source 
pub trait WalkExt: IntoIterator<Item = TokenTree> + FromIterator<TokenTree> {
    // Provided methods
    fn walk<F>(self, f: F) -> Self
       where F: FnMut(TokenTree) -> TokenTree { ... }
    fn grouped_walk<F>(self, delimiter: Delimiter, f: F) -> TokenTree
       where F: FnMut(TokenTree) -> TokenTree { ... }
}
Expand description

Remake each subtree methods

Provided Methods§

Source

fn walk<F>(self, f: F) -> Self
where F: FnMut(TokenTree) -> TokenTree,

Remake each subtree

"(1+2)*3" -> call f on 1, +, 2, (f(1) f(+) f(2)), *, 3

Source

fn grouped_walk<F>(self, delimiter: Delimiter, f: F) -> TokenTree
where F: FnMut(TokenTree) -> TokenTree,

Remake each subtree, and use Group pack it

Additional call f on grouped tokens

"(1+2)*3" -> call f on 1, +, 2, (f(1) f(+) f(2)), *, 3, ((f(1) f(+) f(2)) f(*) f(3))

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.

Implementors§