Struct proc_macro::bridge::scoped_cell::ScopedCell

pub struct ScopedCell<T: LambdaL>(Cell<<T as ApplyL<'static>>::Out>);

🔬This is a nightly-only experimental API. (proc_macro_internals #27812)

Tuple Fields

0: Cell<<T as ApplyL<'static>>::Out>

🔬This is a nightly-only experimental API. (proc_macro_internals #27812)

Implementations

impl<T: LambdaL> ScopedCell<T>

pub const fn new(value: <T as ApplyL<'static>>::Out) -> Self

🔬This is a nightly-only experimental API. (proc_macro_internals #27812)

pub fn replace<'a, R>( &self, replacement: <T as ApplyL<'a>>::Out, f: impl for<'b, 'c> FnOnce(RefMutL<'b, 'c, T>) -> R ) -> R

🔬This is a nightly-only experimental API. (proc_macro_internals #27812)

Sets the value in self to replacement while running f, which gets the old value, mutably. The old value will be restored after f exits, even by panic, including modifications made to it by f.

pub fn set<R>(&self, value: <T as ApplyL<'_>>::Out, f: impl FnOnce() -> R) -> R

🔬This is a nightly-only experimental API. (proc_macro_internals #27812)

Sets the value in self to value while running f.