Allow callback composition (#2330)

* Allow callback composition

Store all the callbacks added to the builder in a `Vec` so bindgen
invokes each one of them in a last-to-first manner.

1 files changed, 5 insertions, 4 deletions

diff --git a/bindgen/ir/function.rs b/bindgen/ir/function.rs
index c160ed81..f488b384 100644
--- a/bindgen/ir/function.rs
+++ b/bindgen/ir/function.rs
@@ -664,10 +664,11 @@ impl ClangSubItemParser for Function {
             // but seems easy enough to handle it here.
             name.push_str("_destructor");
         }
-        if let Some(callbacks) = context.parse_callbacks() {
-            if let Some(nm) = callbacks.generated_name_override(&name) {
-                name = nm;
-            }
+        if let Some(nm) = context
+            .options()
+            .last_callback(|callbacks| callbacks.generated_name_override(&name))
+        {
+            name = nm;
         }
         assert!(!name.is_empty(), "Empty function name.");