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Use OnceCell in cell module documentation

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This commit is contained in:
Marcin Serwin 2023-11-29 17:42:44 +01:00
parent abe34e9ab1
commit 13c16e3afc
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1 changed files with 4 additions and 4 deletions
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8
library/core/src/cell.rs
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@ -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()
//! }
//!