feat: soa_attr for Slice/SliceMut's field

Author: CurryPseudo

soa-derive-internal/src/slice.rs

@@ -39,6 +39,9 @@ pub fn derive(input: &Input) -> TokenStream {
                                  .map(|field| format!("A slice of `{0}` from a [`{1}`](struct.{1}.html)", field, vec_name))
                                  .collect::<Vec<_>>();
 
+    let field_attrs = input.field_attrs.iter()
+        .map(|attr| &attr.slice).collect::<Vec<_>>();
+
     let mut generated = quote! {
         /// A slice of
         #[doc = #doc_url]
@@ -51,6 +54,7 @@ pub fn derive(input: &Input) -> TokenStream {
         #visibility struct #slice_name<'a> {
             #(
                 #[doc = #fields_doc]
+                #(#[#field_attrs])*
                 pub #fields_names: &'a [#fields_types],
             )*
         }
@@ -272,6 +276,9 @@ pub fn derive_mut(input: &Input) -> TokenStream {
                                  .map(|field| format!("A mutable slice of `{0}` from a [`{1}`](struct.{1}.html)", field, vec_name))
                                  .collect::<Vec<_>>();
 
+    let field_attrs = input.field_attrs.iter()
+        .map(|attr| &attr.slice_mut).collect::<Vec<_>>();
+
     let mut generated = quote! {
         /// A mutable slice of
         #[doc = #doc_url]
@@ -283,6 +290,7 @@ pub fn derive_mut(input: &Input) -> TokenStream {
         #visibility struct #slice_mut_name<'a> {
             #(
                 #[doc = #fields_doc]
+                #(#[#field_attrs])*
                 pub #fields_names_1: &'a mut [#fields_types],
             )*
         }

tests/soa_attr.rs

@@ -30,7 +30,9 @@ fn eq_test() {
 #[derive(StructOfArray)]
 #[soa_derive(PartialEq, Debug, Serialize, Deserialize)]
 pub struct Point {
+    #[soa_attr(Slice, deprecated)]
     pub x: f32,
+    #[soa_attr(SliceMut, deprecated)]
     pub y: f32,
     #[soa_attr(Vec, serde(skip))]
     pub meta: bool
@@ -51,5 +53,16 @@ fn serde_skip_test() -> Result<(), serde_json::Error> {
         y: vec![2.0, 4.0],
         meta: vec![]
     });
+    {
+        let slice = soa.as_slice();
+        let _ = slice.x[0]; // Should have a deprecate warning
+        let _ = slice.y[0]; // Should not have a deprecate warning
+    }
+    {
+        let slice = soa.as_mut_slice();
+        let _ = slice.y[0]; // Should have a deprecate warning
+        let _ = slice.x[0]; // Should not have a deprecate warning
+
+    }
     Ok(())
 }