improve LinkMatrixBuilder

src/field/link_matrix_builder.rs

@@ -1,50 +1,72 @@
 use std::num::NonZeroUsize;
 
 #[cfg(feature = "serde-serialize")]
-use serde::Serialize;
+use serde::{Deserialize, Serialize};
 
 use super::LinkMatrix;
 use crate::lattice::LatticeCyclique;
 use crate::CMatrix3;
 
-#[derive(Debug, PartialEq)]
+#[non_exhaustive]
+#[derive(Debug, PartialEq, Clone)]
 #[cfg_attr(feature = "serde-serialize", derive(Serialize))]
-enum LinkMatrixBuilderType<'a, 'lat, Rng: rand::Rng + ?Sized, const D: usize> {
-    Generated(&'lat LatticeCyclique<D>, GenType<'a, Rng>),
+enum LinkMatrixBuilderType<'rng, 'lat, Rng: rand::Rng + ?Sized, const D: usize> {
+    Generated(&'lat LatticeCyclique<D>, GenType<'rng, Rng>),
     Data(Vec<CMatrix3>),
 }
 
+#[non_exhaustive]
 #[derive(Debug, PartialEq)]
-#[cfg_attr(feature = "serde-serialize", derive(Serialize))]
-enum GenType<'a, Rng: rand::Rng + ?Sized> {
+#[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
+enum GenType<'rng, Rng: rand::Rng + ?Sized> {
     Cold,
-    Hot(&'a mut Rng),
+    #[cfg_attr(feature = "serde-serialize", serde(skip_deserializing))]
+    HotDeterministe(&'rng mut Rng),
+    HotDeterministeOwned(Box<Rng>),
     HotThreaded(NonZeroUsize),
 }
 
-impl<'a, 'lat, Rng: rand::Rng + ?Sized, const D: usize> LinkMatrixBuilderType<'a, 'lat, Rng, D> {
+impl<'rng, Rng: rand::Rng + Clone + ?Sized> Clone for GenType<'rng, Rng> {
+    fn clone(&self) -> Self {
+        match self {
+            Self::Cold => Self::Cold,
+            Self::HotDeterministe(rng_ref) => {
+                Self::HotDeterministeOwned(Box::new((*rng_ref).clone()))
+            }
+            Self::HotDeterministeOwned(rng_box) => Self::HotDeterministeOwned(rng_box.clone()),
+            Self::HotThreaded(n) => Self::HotThreaded(*n),
+        }
+    }
+}
+
+impl<'rng, 'lat, Rng: rand::Rng + ?Sized, const D: usize>
+    LinkMatrixBuilderType<'rng, 'lat, Rng, D>
+{
     pub fn into_link_matrix(self) -> LinkMatrix {
         match self {
             Self::Data(data) => LinkMatrix::new(data),
             Self::Generated(l, gen_type) => match gen_type {
                 GenType::Cold => LinkMatrix::new_cold(l),
-                GenType::Hot(rng) => LinkMatrix::new_deterministe(l, rng),
+                GenType::HotDeterministe(rng) => LinkMatrix::new_deterministe(l, rng),
                 // the unwrap is safe because n is non zero
                 // there is a possibility to panic in a thread but very unlikly
                 // (either something break in this API or in thread_rng())
+                GenType::HotDeterministeOwned(mut rng_box) => {
+                    LinkMatrix::new_deterministe(l, &mut rng_box)
+                }
                 GenType::HotThreaded(n) => LinkMatrix::new_random_threaded(l, n.get()).unwrap(),
             },
         }
     }
 }
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Clone)]
 #[cfg_attr(feature = "serde-serialize", derive(Serialize))]
-pub struct LinkMatrixBuilder<'a, 'lat, Rng: rand::Rng + ?Sized, const D: usize> {
-    builder_type: LinkMatrixBuilderType<'a, 'lat, Rng, D>,
+pub struct LinkMatrixBuilder<'rng, 'lat, Rng: rand::Rng + ?Sized, const D: usize> {
+    builder_type: LinkMatrixBuilderType<'rng, 'lat, Rng, D>,
 }
 
-impl<'a, 'lat, Rng: rand::Rng + ?Sized, const D: usize> LinkMatrixBuilder<'a, 'lat, Rng, D> {
+impl<'rng, 'lat, Rng: rand::Rng + ?Sized, const D: usize> LinkMatrixBuilder<'rng, 'lat, Rng, D> {
     pub fn new_from_data(data: Vec<CMatrix3>) -> Self {
         Self {
             builder_type: LinkMatrixBuilderType::Data(data),
@@ -57,7 +79,7 @@ impl<'a, 'lat, Rng: rand::Rng + ?Sized, const D: usize> LinkMatrixBuilder<'a, 'l
         }
     }
 
-    pub fn set_cold(&mut self) -> &mut Self {
+    pub fn set_cold(mut self) -> Self {
         match self.builder_type {
             LinkMatrixBuilderType::Data(_) => {}
             LinkMatrixBuilderType::Generated(l, _) => {
@@ -67,17 +89,18 @@ impl<'a, 'lat, Rng: rand::Rng + ?Sized, const D: usize> LinkMatrixBuilder<'a, 'l
         self
     }
 
-    pub fn set_hot(&mut self, rng: &'a mut Rng) -> &mut Self {
+    pub fn set_hot_deterministe(mut self, rng: &'rng mut Rng) -> Self {
         match self.builder_type {
             LinkMatrixBuilderType::Data(_) => {}
             LinkMatrixBuilderType::Generated(l, _) => {
-                self.builder_type = LinkMatrixBuilderType::Generated(l, GenType::Hot(rng));
+                self.builder_type =
+                    LinkMatrixBuilderType::Generated(l, GenType::HotDeterministe(rng));
             }
         }
         self
     }
 
-    pub fn set_hot_threaded(&mut self, number_of_threads: NonZeroUsize) -> &mut Self {
+    pub fn set_hot_threaded(mut self, number_of_threads: NonZeroUsize) -> Self {
         match self.builder_type {
             LinkMatrixBuilderType::Data(_) => {}
             LinkMatrixBuilderType::Generated(l, _) => {
@@ -92,3 +115,103 @@ impl<'a, 'lat, Rng: rand::Rng + ?Sized, const D: usize> LinkMatrixBuilder<'a, 'l
         self.builder_type.into_link_matrix()
     }
 }
+
+#[doc(hidden)]
+impl<'rng, 'lat, Rng: rand::Rng + ?Sized, const D: usize>
+    From<LinkMatrixBuilderType<'rng, 'lat, Rng, D>> for LinkMatrixBuilder<'rng, 'lat, Rng, D>
+{
+    fn from(builder_type: LinkMatrixBuilderType<'rng, 'lat, Rng, D>) -> Self {
+        Self { builder_type }
+    }
+}
+
+impl<'rng, 'lat, Rng: rand::Rng + ?Sized, const D: usize>
+    From<LinkMatrixBuilder<'rng, 'lat, Rng, D>> for LinkMatrix
+{
+    fn from(builder: LinkMatrixBuilder<'rng, 'lat, Rng, D>) -> Self {
+        builder.build()
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use std::num::NonZeroUsize;
+
+    use rand::rngs::StdRng;
+    use rand::SeedableRng;
+
+    use super::*;
+    use crate::error::LatticeInitializationError;
+
+    const SEED_RNG: u64 = 0x45_78_93_f4_4a_b0_67_f0;
+
+    #[test]
+    fn builder() -> Result<(), LatticeInitializationError> {
+        let lattice = LatticeCyclique::<3>::new(1_f64, 10)?;
+        let m = LinkMatrixBuilder::<'_, '_, rand::rngs::ThreadRng, 3>::new_generated(&lattice)
+            .set_cold()
+            .build();
+        assert_eq!(m, LinkMatrix::new_cold(&lattice));
+
+        let mut rng = StdRng::seed_from_u64(SEED_RNG);
+        let builder = LinkMatrixBuilder::<'_, '_, _, 3>::new_generated(&lattice)
+            .set_hot_deterministe(&mut rng);
+        let m = builder.clone().build();
+        assert_eq!(m, builder.build());
+        let _ = LinkMatrixBuilder::<'_, '_, rand::rngs::ThreadRng, 3>::new_generated(&lattice)
+            .set_hot_threaded(NonZeroUsize::new(rayon::current_num_threads().min(1)).unwrap())
+            .build();
+        assert!(LinkMatrixBuilder::<'_, '_, _, 3>::new_from_data(vec![])
+            .set_cold()
+            .set_hot_deterministe(&mut rng)
+            .set_hot_threaded(NonZeroUsize::new(1).unwrap())
+            .build()
+            .is_empty());
+        assert_eq!(
+            LinkMatrixBuilder::<'_, '_, rand::rngs::ThreadRng, 3>::new_from_data(
+                vec![CMatrix3::identity(); 5]
+            )
+            .build()
+            .as_ref(),
+            vec![CMatrix3::identity(); 5]
+        );
+        assert_eq!(
+            LinkMatrix::from(
+                LinkMatrixBuilder::<'_, '_, rand::rngs::ThreadRng, 3>::new_from_data(
+                    vec![CMatrix3::identity(); 100]
+                )
+            )
+            .as_ref(),
+            vec![CMatrix3::identity(); 100]
+        );
+        Ok(())
+    }
+
+    #[test]
+    fn gen_type() {
+        let mut rng = StdRng::seed_from_u64(SEED_RNG);
+        assert_eq!(
+            GenType::<'_, StdRng>::Cold.clone(),
+            GenType::<'_, StdRng>::Cold
+        );
+        assert_eq!(
+            GenType::HotDeterministeOwned(Box::new(rng.clone())).clone(),
+            GenType::HotDeterministeOwned(Box::new(rng.clone()))
+        );
+        assert_eq!(
+            GenType::<'_, StdRng>::HotThreaded(NonZeroUsize::new(1).unwrap()).clone(),
+            GenType::<'_, StdRng>::HotThreaded(NonZeroUsize::new(1).unwrap())
+        );
+        let gen_type = GenType::HotDeterministe(&mut rng);
+        assert_ne!(gen_type.clone(), gen_type);
+    }
+
+    #[test]
+    fn trait_misc() {
+        let builder_type = LinkMatrixBuilderType::<'_, '_, StdRng, 10>::Data(vec![]);
+        assert_eq!(
+            LinkMatrixBuilder::from(builder_type.clone()).builder_type,
+            builder_type
+        );
+    }
+}