Add support for hashbrown v0.15

Hashbrown support for v0.14 is already included and this just extends
the code to cover the new crate version.

Closes #787

.github/workflows/ci.yaml

@@ -88,7 +88,7 @@ jobs:
       - name: "Check no_std+alloc (No Default Features / ${{ matrix.os }} / ${{ matrix.rust }})"
         run: cargo check --package serde_with --no-default-features --features=alloc --target thumbv7em-none-eabihf
       - name: "Check no_std+alloc+optional (No Default Features / ${{ matrix.os }} / ${{ matrix.rust }})"
-        run: cargo check --package serde_with --no-default-features --features=alloc,base64,chrono_0_4,hashbrown_0_14,hex,indexmap_1,indexmap_2,json,time_0_3 --target thumbv7em-none-eabihf
+        run: cargo check --package serde_with --no-default-features --features=alloc,base64,chrono_0_4,hashbrown_0_14,hashbrown_0_15,hex,indexmap_1,indexmap_2,json,time_0_3 --target thumbv7em-none-eabihf
 
       # The tests are split into build and run steps, to see the time impact of each
       # cargo test --all-targets does NOT run doctests

serde_with/Cargo.toml

@@ -73,6 +73,12 @@ chrono_0_4 = ["dep:chrono_0_4"]
 ## It enables the `alloc` feature.
 ## Some functionality is only available when `std` is enabled too.
 hashbrown_0_14 = ["dep:hashbrown_0_14", "alloc"]
+## The feature enables `hashbrown::{HashMap, HashSet}` as supported containers.
+##
+## This pulls in `hashbrown` v0.15 as a dependency.
+## It enables the `alloc` feature.
+## Some functionality is only available when `std` is enabled too.
+hashbrown_0_15 = ["dep:hashbrown_0_15", "alloc"]
 ## The feature enables serializing data in hex format.
 ##
 ## This pulls in `hex` as a dependency.
@@ -126,6 +132,7 @@ chrono_0_4 = {package = "chrono", version = "0.4.20", optional = true, default-f
 doc-comment = {version = "0.3.3", optional = true}
 document-features = {version = "0.2.7", optional = true}
 hashbrown_0_14 = {package = "hashbrown", version = "0.14.0", optional = true, default-features = false, features = ["serde"]}
+hashbrown_0_15 = {package = "hashbrown", version = "0.15.0", optional = true, default-features = false, features = ["serde"]}
 hex = {version = "0.4.3", optional = true, default-features = false}
 indexmap_1 = {package = "indexmap", version = "1.8", optional = true, default-features = false, features = ["serde-1"]}
 indexmap_2 = {package = "indexmap", version = "2.0", optional = true, default-features = false, features = ["serde"]}
@@ -175,6 +182,11 @@ name = "hashbrown_0_14"
 path = "tests/hashbrown_0_14.rs"
 required-features = ["hashbrown_0_14", "macros"]
 
+[[test]]
+name = "hashbrown_0_15"
+path = "tests/hashbrown_0_15.rs"
+required-features = ["hashbrown_0_15", "macros"]
+
 [[test]]
 name = "indexmap_1"
 path = "tests/indexmap_1.rs"

serde_with/src/de/duplicates.rs

@@ -8,6 +8,8 @@ use crate::{
 };
 #[cfg(feature = "hashbrown_0_14")]
 use hashbrown_0_14::{HashMap as HashbrownMap014, HashSet as HashbrownSet014};
+#[cfg(feature = "hashbrown_0_15")]
+use hashbrown_0_15::{HashMap as HashbrownMap015, HashSet as HashbrownSet015};
 #[cfg(feature = "indexmap_1")]
 use indexmap_1::{IndexMap, IndexSet};
 #[cfg(feature = "indexmap_2")]

serde_with/src/de/impls.rs

@@ -2,6 +2,8 @@ pub(crate) use self::macros::*;
 use crate::{formats::*, prelude::*};
 #[cfg(feature = "hashbrown_0_14")]
 use hashbrown_0_14::{HashMap as HashbrownMap014, HashSet as HashbrownSet014};
+#[cfg(feature = "hashbrown_0_15")]
+use hashbrown_0_15::{HashMap as HashbrownMap015, HashSet as HashbrownSet015};
 #[cfg(feature = "indexmap_1")]
 use indexmap_1::{IndexMap, IndexSet};
 #[cfg(feature = "indexmap_2")]
@@ -32,6 +34,11 @@ pub(crate) mod macros {
                 HashbrownMap014<K: Eq + Hash, V, S: BuildHasher + Default>,
                 (|size| HashbrownMap014::with_capacity_and_hasher(size, Default::default()))
             );
+            #[cfg(feature = "hashbrown_0_15")]
+            $m!(
+                HashbrownMap015<K: Eq + Hash, V, S: BuildHasher + Default>,
+                (|size| HashbrownMap015::with_capacity_and_hasher(size, Default::default()))
+            );
             #[cfg(feature = "indexmap_1")]
             $m!(
                 IndexMap<K: Eq + Hash, V, S: BuildHasher + Default>,
@@ -61,6 +68,12 @@ pub(crate) mod macros {
                 (|size| HashbrownSet014::with_capacity_and_hasher(size, S::default())),
                 insert
             );
+            #[cfg(feature = "hashbrown_0_15")]
+            $m!(
+                HashbrownSet015<T: Eq + Hash, S: BuildHasher + Default>,
+                (|size| HashbrownSet015::with_capacity_and_hasher(size, S::default())),
+                insert
+            );
             #[cfg(feature = "indexmap_1")]
             $m!(
                 IndexSet<T: Eq + Hash, S: BuildHasher + Default>,

serde_with/src/de/skip_error.rs

@@ -2,6 +2,8 @@ use super::impls::macros::foreach_map;
 use crate::prelude::*;
 #[cfg(feature = "hashbrown_0_14")]
 use hashbrown_0_14::HashMap as HashbrownMap014;
+#[cfg(feature = "hashbrown_0_15")]
+use hashbrown_0_15::HashMap as HashbrownMap015;
 #[cfg(feature = "indexmap_1")]
 use indexmap_1::IndexMap;
 #[cfg(feature = "indexmap_2")]

serde_with/src/duplicate_key_impls/error_on_duplicate.rs

@@ -54,6 +54,26 @@ where
     }
 }
 
+#[cfg(feature = "hashbrown_0_15")]
+impl<T, S> PreventDuplicateInsertsSet<T> for hashbrown_0_15::HashSet<T, S>
+where
+    T: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn insert(&mut self, value: T) -> bool {
+        self.insert(value)
+    }
+}
+
 #[cfg(feature = "indexmap_1")]
 impl<T, S> PreventDuplicateInsertsSet<T> for indexmap_1::IndexSet<T, S>
 where
@@ -149,6 +169,26 @@ where
     }
 }
 
+#[cfg(feature = "hashbrown_0_15")]
+impl<K, V, S> PreventDuplicateInsertsMap<K, V> for hashbrown_0_15::HashMap<K, V, S>
+where
+    K: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn insert(&mut self, key: K, value: V) -> bool {
+        self.insert(key, value).is_none()
+    }
+}
+
 #[cfg(feature = "indexmap_1")]
 impl<K, V, S> PreventDuplicateInsertsMap<K, V> for indexmap_1::IndexMap<K, V, S>
 where

serde_with/src/duplicate_key_impls/first_value_wins.rs

@@ -63,6 +63,34 @@ where
     }
 }
 
+#[cfg(feature = "hashbrown_0_15")]
+impl<K, V, S> DuplicateInsertsFirstWinsMap<K, V> for hashbrown_0_15::HashMap<K, V, S>
+where
+    K: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn insert(&mut self, key: K, value: V) {
+        use hashbrown_0_15::hash_map::Entry;
+
+        match self.entry(key) {
+            // we want to keep the first value, so do nothing
+            Entry::Occupied(_) => {}
+            Entry::Vacant(vacant) => {
+                vacant.insert(value);
+            }
+        }
+    }
+}
+
 #[cfg(feature = "indexmap_1")]
 impl<K, V, S> DuplicateInsertsFirstWinsMap<K, V> for indexmap_1::IndexMap<K, V, S>
 where

serde_with/src/duplicate_key_impls/last_value_wins.rs

@@ -49,6 +49,27 @@ where
     }
 }
 
+#[cfg(feature = "hashbrown_0_15")]
+impl<T, S> DuplicateInsertsLastWinsSet<T> for hashbrown_0_15::HashSet<T, S>
+where
+    T: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn replace(&mut self, value: T) {
+        // Hashset already fulfils the contract
+        self.replace(value);
+    }
+}
+
 #[cfg(feature = "indexmap_1")]
 impl<T, S> DuplicateInsertsLastWinsSet<T> for indexmap_1::IndexSet<T, S>
 where

serde_with/src/schemars_0_8.rs

@@ -787,6 +787,8 @@ map_first_last_wins_schema!(BTreeMap<K, V>);
 map_first_last_wins_schema!(=> S HashMap<K, V, S>);
 #[cfg(feature = "hashbrown_0_14")]
 map_first_last_wins_schema!(=> S hashbrown_0_14::HashMap<K, V, S>);
+#[cfg(feature = "hashbrown_0_15")]
+map_first_last_wins_schema!(=> S hashbrown_0_15::HashMap<K, V, S>);
 #[cfg(feature = "indexmap_1")]
 map_first_last_wins_schema!(=> S indexmap_1::IndexMap<K, V, S>);
 #[cfg(feature = "indexmap_2")]

serde_with/src/ser/duplicates.rs

@@ -2,6 +2,8 @@ use super::impls::macros::{foreach_map, foreach_set};
 use crate::prelude::*;
 #[cfg(feature = "hashbrown_0_14")]
 use hashbrown_0_14::{HashMap as HashbrownMap014, HashSet as HashbrownSet014};
+#[cfg(feature = "hashbrown_0_15")]
+use hashbrown_0_15::{HashMap as HashbrownMap015, HashSet as HashbrownSet015};
 #[cfg(feature = "indexmap_1")]
 use indexmap_1::{IndexMap, IndexSet};
 #[cfg(feature = "indexmap_2")]

serde_with/src/ser/impls.rs

@@ -2,6 +2,8 @@ pub(crate) use self::macros::*;
 use crate::{formats::Strictness, prelude::*};
 #[cfg(feature = "hashbrown_0_14")]
 use hashbrown_0_14::{HashMap as HashbrownMap014, HashSet as HashbrownSet014};
+#[cfg(feature = "hashbrown_0_15")]
+use hashbrown_0_15::{HashMap as HashbrownMap015, HashSet as HashbrownSet015};
 #[cfg(feature = "indexmap_1")]
 use indexmap_1::{IndexMap, IndexSet};
 #[cfg(feature = "indexmap_2")]
@@ -29,6 +31,8 @@ pub(crate) mod macros {
         $m!(HashMap<K, V, H: Sized>);
         #[cfg(feature = "hashbrown_0_14")]
         $m!(HashbrownMap014<K, V, H: Sized>);
+        #[cfg(feature = "hashbrown_0_15")]
+        $m!(HashbrownMap015<K, V, H: Sized>);
         #[cfg(feature = "indexmap_1")]
         $m!(IndexMap<K, V, H: Sized>);
         #[cfg(feature = "indexmap_2")]
@@ -44,6 +48,8 @@ pub(crate) mod macros {
         $m!(HashSet<$T, H: Sized>);
         #[cfg(feature = "hashbrown_0_14")]
         $m!(HashbrownSet014<$T, H: Sized>);
+        #[cfg(feature = "hashbrown_0_15")]
+        $m!(HashbrownSet015<$T, H: Sized>);
         #[cfg(feature = "indexmap_1")]
         $m!(IndexSet<$T, H: Sized>);
         #[cfg(feature = "indexmap_2")]

serde_with/src/ser/skip_error.rs

@@ -2,6 +2,8 @@ use super::impls::macros::foreach_map;
 use crate::prelude::*;
 #[cfg(feature = "hashbrown_0_14")]
 use hashbrown_0_14::HashMap as HashbrownMap014;
+#[cfg(feature = "hashbrown_0_15")]
+use hashbrown_0_15::HashMap as HashbrownMap015;
 #[cfg(feature = "indexmap_1")]
 use indexmap_1::IndexMap;
 #[cfg(feature = "indexmap_2")]