Remove nested struct support

engine/src/conversion/parse/parse_bindgen.rs

@@ -274,16 +274,12 @@ impl<'a> ParseBindgen<'a> {
             _ => "Opaque",
         };
         let kind_item = make_ident(kind_item);
-        let effective_type = self
-            .type_database
-            .get_effective_type(&tyname)
-            .unwrap_or(&tyname);
-        if self.type_database.is_on_blocklist(effective_type) {
+        if self.type_database.is_on_blocklist(&tyname) {
             return Ok(());
         }
-        let tynamestring = effective_type.to_cpp_name();
-        let mut for_extern_c_ts = if effective_type.has_namespace() {
-            let ns_string = effective_type
+        let tynamestring = tyname.to_cpp_name();
+        let mut for_extern_c_ts = if tyname.has_namespace() {
+            let ns_string = tyname
                 .ns_segment_iter()
                 .cloned()
                 .collect::<Vec<String>>()

engine/src/integration_tests.rs

@@ -3309,65 +3309,6 @@ fn test_root_ns_meth_ret_nonpod() {
     run_test("", hdr, rs, &["Bob"], &["B::C"]);
 }
 
-#[test]
-fn test_nested_struct_pod() {
-    let hdr = indoc! {"
-        #include <cstdint>
-        struct A {
-            uint32_t a;
-            struct B {
-                uint32_t b;
-            };
-        };
-        inline void daft(A::B a) {};
-    "};
-    let rs = quote! {
-        let b = ffi::B { b: 12 };
-        ffi::daft(b);
-    };
-    run_test_ex(
-        "",
-        hdr,
-        rs,
-        &["daft"],
-        &["B"],
-        TestMethod::BeQuick,
-        Some(quote! {
-            nested_type!("B", "A::B")
-        }),
-    );
-}
-
-#[test]
-fn test_nested_struct_nonpod() {
-    let hdr = indoc! {"
-        #include <cstdint>
-        struct A {
-            uint32_t a;
-            struct B {
-                B() {}
-                uint32_t b;
-            };
-        };
-        inline void daft(A::B) {}
-    "};
-    let rs = quote! {
-        let b = ffi::B::make_unique();
-        ffi::daft(b);
-    };
-    run_test_ex(
-        "",
-        hdr,
-        rs,
-        &["daft", "B"],
-        &[],
-        TestMethod::BeQuick,
-        Some(quote! {
-            nested_type!("B", "A::B")
-        }),
-    );
-}
-
 #[test]
 fn test_forward_declaration() {
     let hdr = indoc! {"

engine/src/lib.rs

@@ -211,16 +211,6 @@ impl IncludeCpp {
                         type_database
                             .note_pod_request(TypeName::new_from_user_input(&generate.value()));
                     }
-                } else if ident == "nested_type" {
-                    let args;
-                    syn::parenthesized!(args in input);
-                    let nested: syn::LitStr = args.parse()?;
-                    args.parse::<syn::Token![,]>()?;
-                    let nested_in: syn::LitStr = args.parse()?;
-                    type_database.note_nested_type(
-                        TypeName::new_from_user_input(&nested.value()),
-                        TypeName::new_from_user_input(&nested_in.value()),
-                    );
                 } else if ident == "block" {
                     let args;
                     syn::parenthesized!(args in input);

engine/src/type_database.rs

@@ -16,14 +16,13 @@ use itertools::Itertools;
 use syn::Type;
 
 use crate::types::TypeName;
-use std::collections::{HashMap, HashSet};
+use std::collections::HashSet;
 
 /// Central registry of all information known about types.
 /// At present this is very minimal; in future we should roll
 /// known_types.rs into this and possibly other things as well.
 #[derive(Default)]
 pub(crate) struct TypeDatabase {
-    nested_types: HashMap<TypeName, TypeName>,
     pod_requests: HashSet<TypeName>,
     allowlist: HashSet<String>, // not TypeName as it may be funcs not types.
     blocklist: HashSet<String>, // not TypeName as it may be funcs not types.
@@ -34,18 +33,10 @@ impl TypeDatabase {
         Self::default()
     }
 
-    pub(crate) fn note_nested_type(&mut self, original: TypeName, replacement: TypeName) {
-        self.nested_types.insert(original, replacement);
-    }
-
     pub(crate) fn note_pod_request(&mut self, tn: TypeName) {
         self.pod_requests.insert(tn);
     }
 
-    pub(crate) fn get_effective_type(&self, original: &TypeName) -> Option<&TypeName> {
-        self.nested_types.get(original)
-    }
-
     pub(crate) fn add_to_allowlist(&mut self, item: String) {
         self.allowlist.insert(item);
     }
@@ -88,7 +79,6 @@ impl TypeDatabase {
                 // If this is a std::unique_ptr we do need to pass
                 // its argument through.
                 let root = TypeName::from_type_path(typ);
-                let root = self.get_effective_type(&root).unwrap_or(&root);
                 let root = root.to_cpp_name();
                 if root == "Pin" {
                     // Strip all Pins from type names when describing them in C++.

src/lib.rs

@@ -250,32 +250,6 @@ macro_rules! exclude_utilities {
     ($($tt:tt)*) => { $crate::usage!{$($tt)*} };
 }
 
-/// Specify that a struct (or other type) is nested within
-/// some outer type. autocxx can't currently determine
-/// this itself; it's hoped that this is a temporary restriction
-/// and that the need for this directive will evaporate soon.
-/// Meanwhile, specify two arguments - first the path to the
-/// type without any nesting; and secondly the path with nesting.
-/// So for instance for a situation like
-/// ```cpp
-/// namespace A {
-///   struct B {
-///     struct C {
-///       uint32_t b;
-///     }
-///     uint32_t a;
-///   }
-/// ```
-/// specify
-/// `nested_type("A::C", "A::B::C")`
-///
-/// A directive to be included inside
-/// [include_cpp] - see [include_cpp] for general information.
-#[macro_export]
-macro_rules! nested_type {
-    ($($tt:tt)*) => { $crate::usage!{$($tt)*} };
-}
-
 /// Entirely block some type from appearing in the generated
 /// code. This can be useful if there is a type which is not
 /// understood by bindgen or autocxx, and incorrect code is