Miscellaneous improvements

nalgebra-lapack/src/qr.rs

@@ -57,9 +57,8 @@ where
         let (nrows, ncols) = m.data.shape();
 
         let mut info = 0;
-        let mut tau = unsafe {
+        let mut tau =
-            Matrix::new_uninitialized_generic(nrows.min(ncols), U1).assume_init()
+            unsafe { Matrix::new_uninitialized_generic(nrows.min(ncols), U1).assume_init() };
-        };
 
         if nrows.value() == 0 || ncols.value() == 0 {
             return Self { qr: m, tau: tau };

src/base/array_storage.rs

@@ -1,4 +1,5 @@
-use std::mem;use std::fmt::{self, Debug, Formatter};
+use std::fmt::{self, Debug, Formatter};
+use std::mem;
 // use std::hash::{Hash, Hasher};
 #[cfg(feature = "abomonation-serialize")]
 use std::io::{Result as IOResult, Write};
@@ -12,8 +13,6 @@ use serde::ser::SerializeSeq;
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 #[cfg(feature = "serde-serialize-no-std")]
 use std::marker::PhantomData;
-#[cfg(feature = "serde-serialize-no-std")]
-use std::mem;
 
 #[cfg(feature = "abomonation-serialize")]
 use abomonation::Abomonation;

src/base/default_allocator.rs

@@ -4,7 +4,7 @@
 //! heap-allocated buffers for matrices with at least one dimension unknown at compile-time.
 
 use std::cmp;
-use std::mem::{self, ManuallyDrop, MaybeUninit};
+use std::mem::{ManuallyDrop, MaybeUninit};
 use std::ptr;
 
 #[cfg(all(feature = "alloc", not(feature = "std")))]
@@ -92,9 +92,8 @@ impl<T, const R: usize, const C: usize> Allocator<T, Const<R>, Const<C>> for Def
         // SAFETY:
         // * `ManuallyDrop<T>` and T are guaranteed to have the same layout
         // * `ManuallyDrop` does not drop, so there are no double-frees
-        // * `ArrayStorage` is transparent.
         // And thus the conversion is safe
-        ArrayStorage(unsafe { mem::transmute_copy(&ManuallyDrop::new(buf.0)) })
+        unsafe { ArrayStorage((&ManuallyDrop::new(buf) as *const _ as *const [_; C]).read()) }
     }
 }
 
@@ -132,32 +131,35 @@ impl<T, C: Dim> Allocator<T, Dynamic, C> for DefaultAllocator {
 
     #[inline]
     unsafe fn assume_init(uninit: Owned<MaybeUninit<T>, Dynamic, C>) -> Owned<T, Dynamic, C> {
-        let mut data = ManuallyDrop::new(uninit.data);
+        // Avoids a double-drop.
+        let (nrows, ncols) = uninit.shape();
+        let vec: Vec<_> = uninit.into();
+        let mut md = ManuallyDrop::new(vec);
 
-        // Safety: MaybeUninit<T> has the same alignment and layout as T.
+        // Safety:
-        let new_data =
+        // - MaybeUninit<T> has the same alignment and layout as T.
-            Vec::from_raw_parts(data.as_mut_ptr() as *mut T, data.len(), data.capacity());
+        // - The length and capacity come from a valid vector.
+        let new_data = Vec::from_raw_parts(md.as_mut_ptr() as *mut _, md.len(), md.capacity());
 
-        VecStorage::new(uninit.nrows, uninit.ncols, new_data)
+        VecStorage::new(nrows, ncols, new_data)
     }
 
     #[inline]
     fn manually_drop(
         buf: <Self as InnerAllocator<T, Dynamic, C>>::Buffer,
     ) -> <Self as InnerAllocator<ManuallyDrop<T>, Dynamic, C>>::Buffer {
-        // Avoids dropping the buffer that will be used for the result.
+        // Avoids a double-drop.
-        let mut data = ManuallyDrop::new(buf.data);
+        let (nrows, ncols) = buf.shape();
+        let vec: Vec<_> = buf.into();
+        let mut md = ManuallyDrop::new(vec);
 
-        // Safety: ManuallyDrop<T> has the same alignment and layout as T.
+        // Safety:
-        let new_data = unsafe {
+        // - ManuallyDrop<T> has the same alignment and layout as T.
-            Vec::from_raw_parts(
+        // - The length and capacity come from a valid vector.
-                data.as_mut_ptr() as *mut ManuallyDrop<T>,
+        let new_data =
-                data.len(),
+            unsafe { Vec::from_raw_parts(md.as_mut_ptr() as *mut _, md.len(), md.capacity()) };
-                data.capacity(),
-            )
-        };
 
-        VecStorage::new(buf.nrows, buf.ncols, new_data)
+        VecStorage::new(nrows, ncols, new_data)
     }
 }
 
@@ -194,32 +196,35 @@ impl<T, R: DimName> Allocator<T, R, Dynamic> for DefaultAllocator {
 
     #[inline]
     unsafe fn assume_init(uninit: Owned<MaybeUninit<T>, R, Dynamic>) -> Owned<T, R, Dynamic> {
-        let mut data = ManuallyDrop::new(uninit.data);
+        // Avoids a double-drop.
+        let (nrows, ncols) = uninit.shape();
+        let vec: Vec<_> = uninit.into();
+        let mut md = ManuallyDrop::new(vec);
 
-        // Safety: MaybeUninit<T> has the same alignment and layout as T.
+        // Safety:
-        let new_data =
+        // - MaybeUninit<T> has the same alignment and layout as T.
-            Vec::from_raw_parts(data.as_mut_ptr() as *mut T, data.len(), data.capacity());
+        // - The length and capacity come from a valid vector.
+        let new_data = Vec::from_raw_parts(md.as_mut_ptr() as *mut _, md.len(), md.capacity());
 
-        VecStorage::new(uninit.nrows, uninit.ncols, new_data)
+        VecStorage::new(nrows, ncols, new_data)
     }
 
     #[inline]
     fn manually_drop(
         buf: <Self as InnerAllocator<T, R, Dynamic>>::Buffer,
     ) -> <Self as InnerAllocator<ManuallyDrop<T>, R, Dynamic>>::Buffer {
-        // Avoids dropping the buffer that will be used for the result.
+        // Avoids a double-drop.
-        let mut data = ManuallyDrop::new(buf.data);
+        let (nrows, ncols) = buf.shape();
+        let vec: Vec<_> = buf.into();
+        let mut md = ManuallyDrop::new(vec);
 
-        // Safety: ManuallyDrop<T> has the same alignment and layout as T.
+        // Safety:
-        let new_data = unsafe {
+        // - ManuallyDrop<T> has the same alignment and layout as T.
-            Vec::from_raw_parts(
+        // - The length and capacity come from a valid vector.
-                data.as_mut_ptr() as *mut ManuallyDrop<T>,
+        let new_data =
-                data.len(),
+            unsafe { Vec::from_raw_parts(md.as_mut_ptr() as *mut _, md.len(), md.capacity()) };
-                data.capacity(),
-            )
-        };
 
-        VecStorage::new(buf.nrows, buf.ncols, new_data)
+        VecStorage::new(nrows, ncols, new_data)
     }
 }
 

src/base/matrix.rs

@@ -385,6 +385,10 @@ where
     /// Assumes a matrix's entries to be initialized. This operation should be near zero-cost.
     ///
     /// For the similar method that operates on matrix slices, see [`slice_assume_init`].
+    ///
+    /// # Safety
+    /// The user must make sure that every single entry of the buffer has been initialized,
+    /// or Undefined Behavior will immediately occur.    
     pub unsafe fn assume_init(self) -> OMatrix<T, R, C> {
         OMatrix::from_data(<DefaultAllocator as Allocator<T, R, C>>::assume_init(
             self.data,
@@ -408,6 +412,10 @@ where
 
 impl<T, R: Dim, C: Dim, S> Matrix<MaybeUninit<T>, R, C, S> {
     /// Creates a full slice from `self` and assumes it to be initialized.
+    ///
+    /// # Safety
+    /// The user must make sure that every single entry of the buffer has been initialized,
+    /// or Undefined Behavior will immediately occur.    
     pub unsafe fn assume_init_ref(&self) -> MatrixSlice<T, R, C, S::RStride, S::CStride>
     where
         S: Storage<MaybeUninit<T>, R, C>,
@@ -416,6 +424,10 @@ impl<T, R: Dim, C: Dim, S> Matrix<MaybeUninit<T>, R, C, S> {
     }
 
     /// Creates a full mutable slice from `self` and assumes it to be initialized.
+    ///
+    /// # Safety
+    /// The user must make sure that every single entry of the buffer has been initialized,
+    /// or Undefined Behavior will immediately occur.    
     pub unsafe fn assume_init_mut(&mut self) -> MatrixSliceMut<T, R, C, S::RStride, S::CStride>
     where
         S: StorageMut<MaybeUninit<T>, R, C>,

src/base/matrix_slice.rs

@@ -237,6 +237,10 @@ impl<'a, T, R: Dim, C: Dim, RStride: Dim, CStride: Dim>
     SliceStorageMut<'a, MaybeUninit<T>, R, C, RStride, CStride>
 {
     /// Assumes a slice storage's entries to be initialized. This operation should be near zero-cost.
+    ///
+    /// # Safety
+    /// The user must make sure that every single entry of the buffer has been initialized,
+    /// or Undefined Behavior will immediately occur.    
     pub unsafe fn assume_init(self) -> SliceStorageMut<'a, T, R, C, RStride, CStride> {
         SliceStorageMut::from_raw_parts(self.ptr as *mut T, self.shape, self.strides)
     }

src/base/vec_storage.rs

@@ -30,9 +30,9 @@ use abomonation::Abomonation;
 /// A Vec-based matrix data storage. It may be dynamically-sized.
 #[derive(Eq, Debug, Clone, PartialEq)]
 pub struct VecStorage<T, R: Dim, C: Dim> {
-    pub(crate) data: Vec<T>,
+    data: Vec<T>,
-    pub(crate) nrows: R,
+    nrows: R,
-    pub(crate) ncols: C,
+    ncols: C,
 }
 
 #[cfg(feature = "serde-serialize")]
@@ -193,7 +193,8 @@ where
 
     #[inline]
     fn clone_owned(&self) -> Owned<T, Dynamic, C>
-    where T:Clone,
+    where
+        T: Clone,
         DefaultAllocator: InnerAllocator<T, Dynamic, C>,
     {
         self.clone()
@@ -242,7 +243,8 @@ where
 
     #[inline]
     fn clone_owned(&self) -> Owned<T, R, Dynamic>
-    where T:Clone,
+    where
+        T: Clone,
         DefaultAllocator: InnerAllocator<T, R, Dynamic>,
     {
         self.clone()

src/debug/random_orthogonal.rs

@@ -1,7 +1,5 @@
 use std::fmt;
 
-#[cfg(feature = "arbitrary")]
-use crate::base::storage::Owned;
 #[cfg(feature = "arbitrary")]
 use quickcheck::{Arbitrary, Gen};
 

src/debug/random_sdp.rs

@@ -1,7 +1,5 @@
 use std::fmt;
 
-#[cfg(feature = "arbitrary")]
-use crate::base::storage::Owned;
 #[cfg(feature = "arbitrary")]
 use quickcheck::{Arbitrary, Gen};
 

src/geometry/point.rs

@@ -108,7 +108,7 @@ where
 impl<T: Serialize, D: DimName> Serialize for OPoint<T, D>
 where
     DefaultAllocator: Allocator<T, D>,
-    <DefaultAllocator as Allocator<T, D>>::Buffer: Serialize,
+    <DefaultAllocator as InnerAllocator<T, D>>::Buffer: Serialize,
 {
     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
     where
@@ -122,7 +122,7 @@ where
 impl<'a, T: Deserialize<'a>, D: DimName> Deserialize<'a> for OPoint<T, D>
 where
     DefaultAllocator: Allocator<T, D>,
-    <DefaultAllocator as Allocator<T, D>>::Buffer: Deserialize<'a>,
+    <DefaultAllocator as InnerAllocator<T, D>>::Buffer: Deserialize<'a>,
 {
     fn deserialize<Des>(deserializer: Des) -> Result<Self, Des::Error>
     where

src/linalg/exp.rs

@@ -1,11 +1,16 @@
 //! This module provides the matrix exponent (exp) function to square matrices.
 //!
-use crate::{ComplexField, OMatrix, RealField, base::{
+use crate::{
+    base::{
         allocator::Allocator,
         dimension::{Const, Dim, DimMin, DimMinimum},
         storage::Storage,
         DefaultAllocator,
-    }, convert, storage::Owned, try_convert};
+    },
+    convert,
+    storage::Owned,
+    try_convert, ComplexField, OMatrix, RealField,
+};
 
 use crate::num::Zero;
 

src/proptest/mod.rs

@@ -327,15 +327,10 @@ where
     D: Dim,
     DefaultAllocator: Allocator<ScalarStrategy::Value, D>,
 {
-    matrix_(value_strategy, length.into(), U1.into())
+    matrix_(value_strategy, length.into(), Const::<1>.into())
 }
 
-impl<NParameters, R, C> Default for MatrixParameters<NParameters, R, C>
+impl<NParameters: Default, R: DimName, C: DimName> Default for MatrixParameters<NParameters, R, C> {
-where
-    NParameters: Default,
-    R: DimName,
-    C: DimName,
-{
     fn default() -> Self {
         Self {
             rows: DimRange::from(R::name()),

src/sparse/cs_matrix.rs

@@ -474,7 +474,7 @@ where
     {
         // Size = R
         let nrows = self.data.shape().0;
-        let mut workspace = Matrix::new_uninitialized_generic(nrows, Const::<1>);
+        let mut workspace = CsMatrix::new_uninitialized_generic(nrows, Const::<1>);
         self.sort_with_workspace(workspace.as_mut_slice());
     }