| #[cfg(feature = "fold")] |
| pub(crate) mod fold { |
| use crate::punctuated::{Pair, Punctuated}; |
| |
| pub(crate) trait FoldHelper { |
| type Item; |
| fn lift<F>(self, f: F) -> Self |
| where |
| F: FnMut(Self::Item) -> Self::Item; |
| } |
| |
| impl<T> FoldHelper for Vec<T> { |
| type Item = T; |
| fn lift<F>(self, f: F) -> Self |
| where |
| F: FnMut(Self::Item) -> Self::Item, |
| { |
| self.into_iter().map(f).collect() |
| } |
| } |
| |
| impl<T, U> FoldHelper for Punctuated<T, U> { |
| type Item = T; |
| fn lift<F>(self, mut f: F) -> Self |
| where |
| F: FnMut(Self::Item) -> Self::Item, |
| { |
| self.into_pairs() |
| .map(Pair::into_tuple) |
| .map(|(t, u)| Pair::new(f(t), u)) |
| .collect() |
| } |
| } |
| } |