made bunch of functions const

src/any/difficulty/mod.rs

@@ -30,11 +30,11 @@ pub struct Difficulty<'map> {
 
 impl<'map> Difficulty<'map> {
     /// Create a new difficulty calculator for the given beatmap.
-    pub fn new(map: &'map Beatmap) -> Self {
+    pub const fn new(map: &'map Beatmap) -> Self {
         Self::new_with_is_convert(Cow::Borrowed(map), false)
     }
 
-    fn new_with_is_convert(map: Cow<'map, Beatmap>, is_convert: bool) -> Self {
+    const fn new_with_is_convert(map: Cow<'map, Beatmap>, is_convert: bool) -> Self {
         Self {
             map,
             is_convert,

src/any/difficulty/mode.rs

@@ -14,8 +14,12 @@ pub struct ModeDifficulty {
 
 impl ModeDifficulty {
     /// Create a new difficulty calculator.
-    pub fn new() -> Self {
-        Self::default()
+    pub const fn new() -> Self {
+        Self {
+            mods: 0,
+            passed_objects: None,
+            clock_rate: None,
+        }
     }
 
     /// Specify mods through their bit values.

src/any/performance/mod.rs

@@ -30,10 +30,11 @@ pub enum Performance<'map> {
 
 impl<'map> Performance<'map> {
     /// Create a new performance calculator for maps of any mode.
-    pub fn new(map: &'map Beatmap) -> Self {
+    pub const fn new(map: &'map Beatmap) -> Self {
+        let mode = map.mode;
         let map = Cow::Borrowed(map);
 
-        match map.mode {
+        match mode {
             GameMode::Osu => Self::Osu(OsuPerformance::new(Converted::new(map, false))),
             GameMode::Taiko => Self::Taiko(TaikoPerformance::new(Converted::new(map, false))),
             GameMode::Catch => Self::Catch(CatchPerformance::new(Converted::new(map, false))),
@@ -274,7 +275,7 @@ impl<'map> Performance<'map> {
 
 impl<A: AttributeProvider> From<A> for Performance<'_> {
     fn from(attrs: A) -> Self {
-        fn inner(attrs: DifficultyAttributes) -> Performance<'static> {
+        const fn inner(attrs: DifficultyAttributes) -> Performance<'static> {
             match attrs {
                 DifficultyAttributes::Osu(attrs) => Performance::Osu(attrs.performance()),
                 DifficultyAttributes::Taiko(attrs) => Performance::Taiko(attrs.performance()),
@@ -309,11 +310,20 @@ impl_from_converted!(Catch);
 impl_from_converted!(Mania);
 
 /// While generating remaining hitresults, decide how they should be distributed.
-#[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub enum HitResultPriority {
     /// Prioritize good hitresults over bad ones
-    #[default]
     BestCase,
     /// Prioritize bad hitresults over good ones
     WorstCase,
 }
+
+impl HitResultPriority {
+    pub(crate) const DEFAULT: Self = Self::BestCase;
+}
+
+impl Default for HitResultPriority {
+    fn default() -> Self {
+        Self::DEFAULT
+    }
+}

src/any/score_state.rs

@@ -5,7 +5,7 @@ use crate::{
 };
 
 /// Aggregation for a score's current state.
-#[derive(Clone, Debug, Default, Eq, PartialEq)]
+#[derive(Clone, Debug, Eq, PartialEq)]
 pub struct ScoreState {
     /// Maximum combo that the score has had so far. **Not** the maximum
     /// possible combo of the map so far.
@@ -32,8 +32,16 @@ pub struct ScoreState {
 
 impl ScoreState {
     /// Create a new empty score state.
-    pub fn new() -> Self {
-        Self::default()
+    pub const fn new() -> Self {
+        Self {
+            max_combo: 0,
+            n_geki: 0,
+            n_katu: 0,
+            n300: 0,
+            n100: 0,
+            n50: 0,
+            misses: 0,
+        }
     }
 
     /// Return the total amount of hits by adding everything up based on the
@@ -158,3 +166,9 @@ impl From<ManiaScoreState> for ScoreState {
         }
     }
 }
+
+impl Default for ScoreState {
+    fn default() -> Self {
+        Self::new()
+    }
+}

src/catch/attributes.rs

@@ -35,8 +35,8 @@ impl CatchDifficultyAttributes {
     }
 
     /// Returns a builder for performance calculation.
-    pub fn performance<'a>(self) -> CatchPerformance<'a> {
-        self.into()
+    pub const fn performance<'a>(self) -> CatchPerformance<'a> {
+        CatchPerformance::from_catch_attributes(self)
     }
 
     pub(crate) fn set_object_count(&mut self, count: &ObjectCount) {

src/catch/convert.rs

@@ -26,7 +26,7 @@ const RNG_SEED: i32 = 1337;
 /// A [`Beatmap`] for [`Catch`] calculations.
 pub type CatchBeatmap<'a> = Converted<'a, Catch>;
 
-pub fn check_convert(map: &Beatmap) -> ConvertStatus {
+pub const fn check_convert(map: &Beatmap) -> ConvertStatus {
     match map.mode {
         GameMode::Osu => ConvertStatus::Conversion,
         GameMode::Catch => ConvertStatus::Noop,

src/catch/performance/mod.rs

@@ -33,8 +33,32 @@ pub struct CatchPerformance<'map> {
 
 impl<'map> CatchPerformance<'map> {
     /// Create a new performance calculator for osu!catch maps.
-    pub fn new(map: CatchBeatmap<'map>) -> Self {
-        map.into()
+    pub const fn new(map: CatchBeatmap<'map>) -> Self {
+        Self {
+            map_or_attrs: MapOrAttrs::Map(map),
+            difficulty: ModeDifficulty::new(),
+            acc: None,
+            combo: None,
+            fruits: None,
+            droplets: None,
+            tiny_droplets: None,
+            tiny_droplet_misses: None,
+            misses: None,
+        }
+    }
+
+    pub(crate) const fn from_catch_attributes(attrs: CatchDifficultyAttributes) -> Self {
+        Self {
+            map_or_attrs: MapOrAttrs::Attrs(attrs),
+            difficulty: ModeDifficulty::new(),
+            acc: None,
+            combo: None,
+            fruits: None,
+            droplets: None,
+            tiny_droplets: None,
+            tiny_droplet_misses: None,
+            misses: None,
+        }
     }
 
     /// Provide the result of a previous difficulty or performance calculation.
@@ -406,39 +430,19 @@ impl<'map> TryFrom<OsuPerformance<'map>> for CatchPerformance<'map> {
 
 impl<'map> From<CatchBeatmap<'map>> for CatchPerformance<'map> {
     fn from(map: CatchBeatmap<'map>) -> Self {
-        Self {
-            map_or_attrs: MapOrAttrs::Map(map),
-            difficulty: ModeDifficulty::new(),
-            acc: None,
-            combo: None,
-            fruits: None,
-            droplets: None,
-            tiny_droplets: None,
-            tiny_droplet_misses: None,
-            misses: None,
-        }
+        Self::new(map)
     }
 }
 
 impl From<CatchDifficultyAttributes> for CatchPerformance<'_> {
     fn from(attrs: CatchDifficultyAttributes) -> Self {
-        Self {
-            map_or_attrs: MapOrAttrs::Attrs(attrs),
-            difficulty: ModeDifficulty::new(),
-            acc: None,
-            combo: None,
-            fruits: None,
-            droplets: None,
-            tiny_droplets: None,
-            tiny_droplet_misses: None,
-            misses: None,
-        }
+        Self::from_catch_attributes(attrs)
     }
 }
 
 impl From<CatchPerformanceAttributes> for CatchPerformance<'_> {
     fn from(attrs: CatchPerformanceAttributes) -> Self {
-        attrs.difficulty.into()
+        Self::from_catch_attributes(attrs.difficulty)
     }
 }
 

src/catch/score_state.rs

@@ -1,5 +1,5 @@
 /// Aggregation for a score's current state.
-#[derive(Clone, Debug, Default, PartialEq, Eq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct CatchScoreState {
     /// Maximum combo that the score has had so far.
     /// **Not** the maximum possible combo of the map so far.
@@ -20,8 +20,15 @@ pub struct CatchScoreState {
 
 impl CatchScoreState {
     /// Create a new empty score state.
-    pub fn new() -> Self {
-        Self::default()
+    pub const fn new() -> Self {
+        Self {
+            max_combo: 0,
+            n_fruits: 0,
+            n_droplets: 0,
+            n_tiny_droplets: 0,
+            n_tiny_droplet_misses: 0,
+            misses: 0,
+        }
     }
 
     /// Return the total amount of hits by adding everything up.
@@ -47,3 +54,9 @@ impl CatchScoreState {
         f64::from(numerator) / f64::from(denominator)
     }
 }
+
+impl Default for CatchScoreState {
+    fn default() -> Self {
+        Self::new()
+    }
+}

src/mania/attributes.rs

@@ -36,8 +36,8 @@ impl ManiaDifficultyAttributes {
     }
 
     /// Returns a builder for performance calculation.
-    pub fn performance<'a>(self) -> ManiaPerformance<'a> {
-        self.into()
+    pub const fn performance<'a>(self) -> ManiaPerformance<'a> {
+        ManiaPerformance::from_mania_attributes(self)
     }
 }
 

src/mania/convert/mod.rs

@@ -32,7 +32,7 @@ pub type ManiaBeatmap<'a> = Converted<'a, Mania>;
 
 const MAX_NOTES_FOR_DENSITY: usize = 7;
 
-pub fn check_convert(map: &Beatmap) -> ConvertStatus {
+pub const fn check_convert(map: &Beatmap) -> ConvertStatus {
     match map.mode {
         GameMode::Osu => ConvertStatus::Conversion,
         GameMode::Mania => ConvertStatus::Noop,

src/mania/performance/mod.rs

@@ -34,8 +34,34 @@ pub struct ManiaPerformance<'map> {
 
 impl<'map> ManiaPerformance<'map> {
     /// Create a new performance calculator for osu!mania maps.
-    pub fn new(map: ManiaBeatmap<'map>) -> Self {
-        map.into()
+    pub const fn new(map: ManiaBeatmap<'map>) -> Self {
+        Self {
+            map_or_attrs: MapOrAttrs::Map(map),
+            difficulty: ModeDifficulty::new(),
+            n320: None,
+            n300: None,
+            n200: None,
+            n100: None,
+            n50: None,
+            misses: None,
+            acc: None,
+            hitresult_priority: HitResultPriority::DEFAULT,
+        }
+    }
+
+    pub(crate) const fn from_mania_attributes(attrs: ManiaDifficultyAttributes) -> Self {
+        Self {
+            map_or_attrs: MapOrAttrs::Attrs(attrs),
+            difficulty: ModeDifficulty::new(),
+            n320: None,
+            n300: None,
+            n200: None,
+            n100: None,
+            n50: None,
+            misses: None,
+            acc: None,
+            hitresult_priority: HitResultPriority::DEFAULT,
+        }
     }
 
     /// Provide the result of a previous difficulty or performance calculation.
@@ -796,41 +822,19 @@ impl<'map> TryFrom<OsuPerformance<'map>> for ManiaPerformance<'map> {
 
 impl<'map> From<ManiaBeatmap<'map>> for ManiaPerformance<'map> {
     fn from(map: ManiaBeatmap<'map>) -> Self {
-        Self {
-            map_or_attrs: MapOrAttrs::Map(map),
-            difficulty: ModeDifficulty::new(),
-            n320: None,
-            n300: None,
-            n200: None,
-            n100: None,
-            n50: None,
-            misses: None,
-            acc: None,
-            hitresult_priority: HitResultPriority::default(),
-        }
+        Self::new(map)
     }
 }
 
 impl From<ManiaDifficultyAttributes> for ManiaPerformance<'_> {
     fn from(attrs: ManiaDifficultyAttributes) -> Self {
-        Self {
-            map_or_attrs: MapOrAttrs::Attrs(attrs),
-            difficulty: ModeDifficulty::new(),
-            n320: None,
-            n300: None,
-            n200: None,
-            n100: None,
-            n50: None,
-            misses: None,
-            acc: None,
-            hitresult_priority: HitResultPriority::default(),
-        }
+        Self::from_mania_attributes(attrs)
     }
 }
 
 impl From<ManiaPerformanceAttributes> for ManiaPerformance<'_> {
     fn from(attrs: ManiaPerformanceAttributes) -> Self {
-        attrs.difficulty.into()
+        Self::from_mania_attributes(attrs.difficulty)
     }
 }
 

src/mania/score_state.rs

@@ -1,5 +1,5 @@
 /// Aggregation for a score's current state.
-#[derive(Clone, Debug, Default, PartialEq, Eq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct ManiaScoreState {
     /// Amount of current 320s.
     pub n320: u32,
@@ -17,8 +17,15 @@ pub struct ManiaScoreState {
 
 impl ManiaScoreState {
     /// Create a new empty score state.
-    pub fn new() -> Self {
-        Self::default()
+    pub const fn new() -> Self {
+        Self {
+            n320: 0,
+            n300: 0,
+            n200: 0,
+            n100: 0,
+            n50: 0,
+            misses: 0,
+        }
     }
 
     /// Return the total amount of hits by adding everything up.
@@ -40,3 +47,9 @@ impl ManiaScoreState {
         f64::from(numerator) / f64::from(denominator)
     }
 }
+
+impl Default for ManiaScoreState {
+    fn default() -> Self {
+        Self::new()
+    }
+}

src/model/beatmap/mod.rs

@@ -71,12 +71,12 @@ impl Beatmap {
     }
 
     /// Create a difficulty calculator for this [`Beatmap`].
-    pub fn difficulty(&self) -> Difficulty<'_> {
+    pub const fn difficulty(&self) -> Difficulty<'_> {
         Difficulty::new(self)
     }
 
     /// Create a performance calculator for this [`Beatmap`].
-    pub fn performance(&self) -> Performance<'_> {
+    pub const fn performance(&self) -> Performance<'_> {
         Performance::new(self)
     }
 
@@ -150,8 +150,8 @@ impl Beatmap {
 
     /// Returns a [`BeatmapAttributesBuilder`] to calculate modified beatmap
     /// attributes.
-    pub fn attributes(&self) -> BeatmapAttributesBuilder {
-        self.into()
+    pub const fn attributes(&self) -> BeatmapAttributesBuilder {
+        BeatmapAttributesBuilder::new(self)
     }
 
     /// The beats per minute of the map.

src/osu/attributes.rs

@@ -43,8 +43,8 @@ impl OsuDifficultyAttributes {
     }
 
     /// Returns a builder for performance calculation.
-    pub fn performance<'a>(self) -> OsuPerformance<'a> {
-        self.into()
+    pub const fn performance<'a>(self) -> OsuPerformance<'a> {
+        OsuPerformance::from_osu_attributes(self)
     }
 }
 

src/osu/difficulty/gradual.rs

@@ -245,7 +245,7 @@ mod osu_objects {
     }
 
     impl OsuObjects {
-        pub(super) fn new(objects: Box<[OsuObject]>) -> Self {
+        pub(super) const fn new(objects: Box<[OsuObject]>) -> Self {
             Self { objects }
         }
 

src/osu/performance/mod.rs

@@ -37,8 +37,32 @@ pub struct OsuPerformance<'map> {
 
 impl<'map> OsuPerformance<'map> {
     /// Create a new performance calculator for osu!standard maps.
-    pub fn new(map: OsuBeatmap<'map>) -> Self {
-        map.into()
+    pub const fn new(map: OsuBeatmap<'map>) -> Self {
+        Self {
+            map_or_attrs: MapOrAttrs::Map(map),
+            difficulty: ModeDifficulty::new(),
+            acc: None,
+            combo: None,
+            n300: None,
+            n100: None,
+            n50: None,
+            misses: None,
+            hitresult_priority: HitResultPriority::DEFAULT,
+        }
+    }
+
+    pub(crate) const fn from_osu_attributes(attrs: OsuDifficultyAttributes) -> Self {
+        Self {
+            map_or_attrs: MapOrAttrs::Attrs(attrs),
+            difficulty: ModeDifficulty::new(),
+            acc: None,
+            combo: None,
+            n300: None,
+            n100: None,
+            n50: None,
+            misses: None,
+            hitresult_priority: HitResultPriority::DEFAULT,
+        }
     }
 
     /// Attempt to convert the map to the specified mode.
@@ -449,39 +473,19 @@ impl<'map> OsuPerformance<'map> {
 
 impl<'map> From<OsuBeatmap<'map>> for OsuPerformance<'map> {
     fn from(map: OsuBeatmap<'map>) -> Self {
-        Self {
-            map_or_attrs: MapOrAttrs::Map(map),
-            difficulty: ModeDifficulty::new(),
-            acc: None,
-            combo: None,
-            n300: None,
-            n100: None,
-            n50: None,
-            misses: None,
-            hitresult_priority: HitResultPriority::default(),
-        }
+        Self::new(map)
     }
 }
 
 impl From<OsuDifficultyAttributes> for OsuPerformance<'_> {
     fn from(attrs: OsuDifficultyAttributes) -> Self {
-        Self {
-            map_or_attrs: MapOrAttrs::Attrs(attrs),
-            difficulty: ModeDifficulty::new(),
-            acc: None,
-            combo: None,
-            n300: None,
-            n100: None,
-            n50: None,
-            misses: None,
-            hitresult_priority: HitResultPriority::default(),
-        }
+        Self::from_osu_attributes(attrs)
     }
 }
 
 impl From<OsuPerformanceAttributes> for OsuPerformance<'_> {
     fn from(attrs: OsuPerformanceAttributes) -> Self {
-        attrs.difficulty.into()
+        Self::from_osu_attributes(attrs.difficulty)
     }
 }
 

src/osu/score_state.rs

@@ -1,5 +1,5 @@
 /// Aggregation for a score's current state.
-#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
 pub struct OsuScoreState {
     /// Maximum combo that the score has had so far.
     /// **Not** the maximum possible combo of the map so far.
@@ -16,8 +16,14 @@ pub struct OsuScoreState {
 
 impl OsuScoreState {
     /// Create a new empty score state.
-    pub fn new() -> Self {
-        Self::default()
+    pub const fn new() -> Self {
+        Self {
+            max_combo: 0,
+            n300: 0,
+            n100: 0,
+            n50: 0,
+            misses: 0,
+        }
     }
 
     /// Return the total amount of hits by adding everything up.
@@ -39,3 +45,9 @@ impl OsuScoreState {
         f64::from(numerator) / f64::from(denominator)
     }
 }
+
+impl Default for OsuScoreState {
+    fn default() -> Self {
+        Self::new()
+    }
+}

src/taiko/attributes.rs

@@ -37,8 +37,8 @@ impl TaikoDifficultyAttributes {
     }
 
     /// Returns a builder for performance calculation.
-    pub fn performance<'a>(self) -> TaikoPerformance<'a> {
-        self.into()
+    pub const fn performance<'a>(self) -> TaikoPerformance<'a> {
+        TaikoPerformance::from_taiko_attributes(self)
     }
 }
 

src/taiko/convert.rs

@@ -23,7 +23,7 @@ pub type TaikoBeatmap<'a> = Converted<'a, Taiko>;
 const LEGACY_TAIKO_VELOCITY_MULTIPLIER: f32 = 1.4;
 const OSU_BASE_SCORING_DIST: f32 = 100.0;
 
-pub fn check_convert(map: &Beatmap) -> ConvertStatus {
+pub const fn check_convert(map: &Beatmap) -> ConvertStatus {
     match map.mode {
         GameMode::Osu => ConvertStatus::Conversion,
         GameMode::Taiko => ConvertStatus::Noop,

src/taiko/performance/mod.rs

@@ -32,8 +32,30 @@ pub struct TaikoPerformance<'map> {
 
 impl<'map> TaikoPerformance<'map> {
     /// Create a new performance calculator for osu!taiko maps.
-    pub fn new(map: TaikoBeatmap<'map>) -> Self {
-        map.into()
+    pub const fn new(map: TaikoBeatmap<'map>) -> Self {
+        Self {
+            map_or_attrs: MapOrAttrs::Map(map),
+            difficulty: ModeDifficulty::new(),
+            combo: None,
+            acc: None,
+            misses: None,
+            n300: None,
+            n100: None,
+            hitresult_priority: HitResultPriority::DEFAULT,
+        }
+    }
+
+    pub(crate) const fn from_taiko_attributes(attrs: TaikoDifficultyAttributes) -> Self {
+        Self {
+            map_or_attrs: MapOrAttrs::Attrs(attrs),
+            difficulty: ModeDifficulty::new(),
+            combo: None,
+            acc: None,
+            misses: None,
+            n300: None,
+            n100: None,
+            hitresult_priority: HitResultPriority::DEFAULT,
+        }
     }
 
     /// Provide the result of a previous difficulty or performance calculation.
@@ -336,37 +358,19 @@ impl<'map> TryFrom<OsuPerformance<'map>> for TaikoPerformance<'map> {
 
 impl<'map> From<TaikoBeatmap<'map>> for TaikoPerformance<'map> {
     fn from(map: TaikoBeatmap<'map>) -> Self {
-        Self {
-            map_or_attrs: MapOrAttrs::Map(map),
-            difficulty: ModeDifficulty::new(),
-            combo: None,
-            acc: None,
-            misses: None,
-            n300: None,
-            n100: None,
-            hitresult_priority: HitResultPriority::default(),
-        }
+        Self::new(map)
     }
 }
 
 impl From<TaikoDifficultyAttributes> for TaikoPerformance<'_> {
     fn from(attrs: TaikoDifficultyAttributes) -> Self {
-        Self {
-            map_or_attrs: MapOrAttrs::Attrs(attrs),
-            difficulty: ModeDifficulty::new(),
-            combo: None,
-            acc: None,
-            misses: None,
-            n300: None,
-            n100: None,
-            hitresult_priority: HitResultPriority::default(),
-        }
+        Self::from_taiko_attributes(attrs)
     }
 }
 
 impl From<TaikoPerformanceAttributes> for TaikoPerformance<'_> {
     fn from(attrs: TaikoPerformanceAttributes) -> Self {
-        attrs.difficulty.into()
+        Self::from_taiko_attributes(attrs.difficulty)
     }
 }
 

src/taiko/score_state.rs

@@ -1,5 +1,5 @@
 /// Aggregation for a score's current state.
-#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
 pub struct TaikoScoreState {
     /// Maximum combo that the score has had so far.
     /// **Not** the maximum possible combo of the map so far.
@@ -14,8 +14,13 @@ pub struct TaikoScoreState {
 
 impl TaikoScoreState {
     /// Create a new empty score state.
-    pub fn new() -> Self {
-        Self::default()
+    pub const fn new() -> Self {
+        Self {
+            max_combo: 0,
+            n300: 0,
+            n100: 0,
+            misses: 0,
+        }
     }
 
     /// Return the total amount of hits by adding everything up.
@@ -37,3 +42,9 @@ impl TaikoScoreState {
         f64::from(numerator) / f64::from(denominator)
     }
 }
+
+impl Default for TaikoScoreState {
+    fn default() -> Self {
+        Self::new()
+    }
+}