Introduce `DeriveInfo` (#2355)

This PR introduces a new non-exhaustive `struct` called `DeriveInfo` to be used as the sole argument of `ParseCallbacks::add_derives` with the purpose of being able to extend the information passed to this method in a backwards-compatible manner, meaning that adding new fields to `DeriveInfo` won't be a breaking change when releasing a new version.

1 files changed, 8 insertions, 5 deletions

diff --git a/bindgen/codegen/mod.rs b/bindgen/codegen/mod.rs
index c7ac59db..e758963a 100644
--- a/bindgen/codegen/mod.rs
+++ b/bindgen/codegen/mod.rs
@@ -2114,9 +2114,11 @@ impl CodeGenerator for CompInfo {
 
         // The custom derives callback may return a list of derive attributes;
         // add them to the end of the list.
-        let custom_derives = ctx
-            .options()
-            .all_callbacks(|cb| cb.add_derives(&canonical_name));
+        let custom_derives = ctx.options().all_callbacks(|cb| {
+            cb.add_derives(&crate::callbacks::DeriveInfo {
+                name: &canonical_name,
+            })
+        });
         // In most cases this will be a no-op, since custom_derives will be empty.
         derives.extend(custom_derives.iter().map(|s| s.as_str()));
 
@@ -3168,8 +3170,9 @@ impl CodeGenerator for Enum {
 
             // The custom derives callback may return a list of derive attributes;
             // add them to the end of the list.
-            let custom_derives =
-                ctx.options().all_callbacks(|cb| cb.add_derives(&name));
+            let custom_derives = ctx.options().all_callbacks(|cb| {
+                cb.add_derives(&crate::callbacks::DeriveInfo { name: &name })
+            });
             // In most cases this will be a no-op, since custom_derives will be empty.
             derives.extend(custom_derives.iter().map(|s| s.as_str()));