mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-11 08:05:12 +00:00
46 lines
1.2 KiB
Rust
46 lines
1.2 KiB
Rust
|
|
|
|
#![allow(unused, needless_pass_by_value)]
|
|
|
|
#![warn(map_entry)]
|
|
|
|
use std::collections::{BTreeMap, HashMap};
|
|
use std::hash::Hash;
|
|
|
|
fn foo() {}
|
|
|
|
fn insert_if_absent0<K: Eq + Hash, V>(m: &mut HashMap<K, V>, k: K, v: V) {
|
|
if !m.contains_key(&k) { m.insert(k, v); }
|
|
}
|
|
|
|
fn insert_if_absent1<K: Eq + Hash, V>(m: &mut HashMap<K, V>, k: K, v: V) {
|
|
if !m.contains_key(&k) { foo(); m.insert(k, v); }
|
|
}
|
|
|
|
fn insert_if_absent2<K: Eq + Hash, V>(m: &mut HashMap<K, V>, k: K, v: V) {
|
|
if !m.contains_key(&k) { m.insert(k, v) } else { None };
|
|
}
|
|
|
|
fn insert_if_present2<K: Eq + Hash, V>(m: &mut HashMap<K, V>, k: K, v: V) {
|
|
if m.contains_key(&k) { None } else { m.insert(k, v) };
|
|
}
|
|
|
|
fn insert_if_absent3<K: Eq + Hash, V>(m: &mut HashMap<K, V>, k: K, v: V) {
|
|
if !m.contains_key(&k) { foo(); m.insert(k, v) } else { None };
|
|
}
|
|
|
|
fn insert_if_present3<K: Eq + Hash, V>(m: &mut HashMap<K, V>, k: K, v: V) {
|
|
if m.contains_key(&k) { None } else { foo(); m.insert(k, v) };
|
|
}
|
|
|
|
fn insert_in_btreemap<K: Ord, V>(m: &mut BTreeMap<K, V>, k: K, v: V) {
|
|
if !m.contains_key(&k) { foo(); m.insert(k, v) } else { None };
|
|
}
|
|
|
|
fn insert_other_if_absent<K: Eq + Hash, V>(m: &mut HashMap<K, V>, k: K, o: K, v: V) {
|
|
if !m.contains_key(&k) { m.insert(o, v); }
|
|
}
|
|
|
|
fn main() {
|
|
}
|