#![warn(clippy::map_entry)] | |
#![allow(dead_code)] | |
use std::collections::BTreeMap; | |
fn foo() {} | |
fn btree_map<K: Eq + Ord + Copy, V: Copy>(m: &mut BTreeMap<K, V>, k: K, v: V) { | |
// insert then do something, use if let | |
if let std::collections::btree_map::Entry::Vacant(e) = m.entry(k) { | |
e.insert(v); | |
foo(); | |
} | |
} | |
fn main() {} |