180 lines
3.7 KiB
Rust
180 lines
3.7 KiB
Rust
//@needs-asm-support
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#![allow(unused, clippy::needless_pass_by_value, clippy::collapsible_if)]
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#![warn(clippy::map_entry)]
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use std::arch::asm;
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use std::collections::HashMap;
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use std::hash::Hash;
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macro_rules! m {
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($e:expr) => {{ $e }};
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}
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macro_rules! insert {
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($map:expr, $key:expr, $val:expr) => {
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$map.insert($key, $val)
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};
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}
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fn foo() {}
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fn hash_map<K: Eq + Hash + Copy, V: Copy>(m: &mut HashMap<K, V>, m2: &mut HashMap<K, V>, k: K, k2: K, v: V, v2: V) {
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// or_insert(v)
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m.entry(k).or_insert(v);
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// semicolon on insert, use or_insert_with(..)
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m.entry(k).or_insert_with(|| {
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if true {
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v
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} else {
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v2
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}
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});
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// semicolon on if, use or_insert_with(..)
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m.entry(k).or_insert_with(|| {
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if true {
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v
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} else {
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v2
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}
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});
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// early return, use if let
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if let std::collections::hash_map::Entry::Vacant(e) = m.entry(k) {
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if true {
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e.insert(v);
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} else {
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e.insert(v2);
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return;
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}
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}
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// use or_insert_with(..)
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m.entry(k).or_insert_with(|| {
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foo();
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v
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});
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// semicolon on insert and match, use or_insert_with(..)
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m.entry(k).or_insert_with(|| {
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match 0 {
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1 if true => {
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v
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},
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_ => {
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v2
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},
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}
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});
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// one branch doesn't insert, use if let
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if let std::collections::hash_map::Entry::Vacant(e) = m.entry(k) {
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match 0 {
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0 => foo(),
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_ => {
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e.insert(v2);
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},
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};
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}
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// use or_insert_with
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m.entry(k).or_insert_with(|| {
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foo();
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match 0 {
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0 if false => {
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v
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},
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1 => {
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foo();
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v
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},
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2 | 3 => {
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for _ in 0..2 {
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foo();
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}
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if true {
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v
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} else {
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v2
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}
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},
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_ => {
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v2
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},
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}
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});
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// ok, insert in loop
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if !m.contains_key(&k) {
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for _ in 0..2 {
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m.insert(k, v);
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}
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}
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// macro_expansion test, use or_insert(..)
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m.entry(m!(k)).or_insert_with(|| m!(v));
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// ok, map used before insertion
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if !m.contains_key(&k) {
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let _ = m.len();
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m.insert(k, v);
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}
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// ok, inline asm
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if !m.contains_key(&k) {
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unsafe { asm!("nop") }
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m.insert(k, v);
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}
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// ok, different keys.
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if !m.contains_key(&k) {
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m.insert(k2, v);
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}
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// ok, different maps
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if !m.contains_key(&k) {
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m2.insert(k, v);
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}
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// ok, insert in macro
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if !m.contains_key(&k) {
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insert!(m, k, v);
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}
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// or_insert_with. Partial move of a local declared in the closure is ok.
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m.entry(k).or_insert_with(|| {
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let x = (String::new(), String::new());
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let _ = x.0;
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v
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});
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}
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// Issue 10331
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// do not suggest a bad expansion because the compiler unrolls the first
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// occurrence of the loop
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pub fn issue_10331() {
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let mut m = HashMap::new();
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let mut i = 0;
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let mut x = 0;
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while !m.contains_key(&x) {
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m.insert(x, i);
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i += 1;
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x += 1;
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}
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}
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/// Issue 11935
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/// Do not suggest using entries if the map is used inside the `insert` expression.
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pub fn issue_11935() {
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let mut counts: HashMap<u64, u64> = HashMap::new();
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if !counts.contains_key(&1) {
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counts.insert(1, 1);
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} else {
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counts.insert(1, counts.get(&1).unwrap() + 1);
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}
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}
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fn main() {}
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