diff options
| -rw-r--r-- | library/core/src/cell.rs | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/library/core/src/cell.rs b/library/core/src/cell.rs index f10a82c5694..030040ba09a 100644 --- a/library/core/src/cell.rs +++ b/library/core/src/cell.rs @@ -143,17 +143,17 @@ //! //! ``` //! # #![allow(dead_code)] -//! use std::cell::RefCell; +//! use std::cell::OnceCell; //! //! struct Graph { //! edges: Vec<(i32, i32)>, -//! span_tree_cache: RefCell<Option<Vec<(i32, i32)>>> +//! span_tree_cache: OnceCell<Vec<(i32, i32)>> //! } //! //! impl Graph { //! fn minimum_spanning_tree(&self) -> Vec<(i32, i32)> { -//! self.span_tree_cache.borrow_mut() -//! .get_or_insert_with(|| self.calc_span_tree()) +//! self.span_tree_cache +//! .get_or_init(|| self.calc_span_tree()) //! .clone() //! } //! |