Impl DMatrix/DVector::from_vec_storage

These methods enable safe & const construction of DMatrix/DVector from a
given VecStorage.

src/base/vec_storage.rs

@@ -15,6 +15,7 @@ use crate::base::{Scalar, Vector};
 
 #[cfg(feature = "abomonation-serialize")]
 use abomonation::Abomonation;
+use crate::{DMatrix, DVector};
 
 /*
  *
@@ -410,3 +411,23 @@ impl<T> Extend<T> for VecStorage<T, Dynamic, U1> {
         self.nrows = Dynamic::new(self.data.len());
     }
 }
+
+impl<T> DMatrix<T>
+{
+    /// Creates a new heap-allocated matrix from the given [VecStorage].
+    pub const fn from_vec_storage(storage: VecStorage<T, Dynamic, Dynamic>) -> Self {
+        // This is sound because the dimensions of the matrix and the storage are guaranteed
+        // to be the same
+        unsafe { Self::from_data_statically_unchecked(storage) }
+    }
+}
+
+impl<T> DVector<T>
+{
+    /// Creates a new heap-allocated matrix from the given [VecStorage].
+    pub const fn from_vec_storage(storage: VecStorage<T, Dynamic, U1>) -> Self {
+        // This is sound because the dimensions of the matrix and the storage are guaranteed
+        // to be the same
+        unsafe { Self::from_data_statically_unchecked(storage) }
+    }
+}