AsPtr helper trait to get pointer of slice

Author: termoshtt

lax/src/lib.rs

@@ -126,6 +126,31 @@ impl Lapack for f64 {}
 impl Lapack for c32 {}
 impl Lapack for c64 {}
 
+/// Helper for getting pointer of slice
+pub(crate) trait AsPtr: Sized {
+    type Elem;
+    fn as_ptr(vec: &[Self]) -> *const Self::Elem;
+    fn as_mut_ptr(vec: &mut [Self]) -> *mut Self::Elem;
+}
+
+macro_rules! impl_as_ptr {
+    ($target:ty, $elem:ty) => {
+        impl AsPtr for $target {
+            type Elem = $elem;
+            fn as_ptr(vec: &[Self]) -> *const Self::Elem {
+                vec.as_ptr() as *const _
+            }
+            fn as_mut_ptr(vec: &mut [Self]) -> *mut Self::Elem {
+                vec.as_mut_ptr() as *mut _
+            }
+        }
+    };
+}
+impl_as_ptr!(f32, f32);
+impl_as_ptr!(f64, f64);
+impl_as_ptr!(c32, lapack_sys::__BindgenComplex<f32>);
+impl_as_ptr!(c64, lapack_sys::__BindgenComplex<f64>);
+
 /// Upper/Lower specification for seveal usages
 #[derive(Debug, Clone, Copy)]
 #[repr(u8)]