fix: rm comments, add cpp_compat to cbindgen

lez/indexer/ffi/Cargo.toml

@@ -7,15 +7,12 @@ version = "0.1.0"
 [dependencies]
 lee.workspace = true
 indexer_core.workspace = true
-# `convert` brings in the LEE <-> protocol `From`/`TryFrom` impls the query
-# marshalling relies on (previously pulled in transitively via `indexer_service`).
 indexer_service_protocol = { workspace = true, features = ["convert"] }
 
 env_logger.workspace = true
 log = { workspace = true }
 tokio = { features = ["rt-multi-thread"], workspace = true }
 futures.workspace = true
-# Serializes the indexer status snapshot to JSON for `query_status`.
 serde_json.workspace = true
 
 [build-dependencies]

lez/indexer/ffi/build.rs

@@ -6,6 +6,7 @@ fn main() {
     cbindgen::Builder::new()
         .with_crate(crate_dir)
         .with_language(cbindgen::Language::C)
+        .with_cpp_compat(true)
         .with_pragma_once(true)
         .generate()
         .expect("Unable to generate bindings")

lez/indexer/ffi/indexer_ffi.h

@@ -407,6 +407,10 @@ typedef struct PointerResult_FfiVec_FfiTransaction_____OperationStatus {
   enum OperationStatus error;
 } PointerResult_FfiVec_FfiTransaction_____OperationStatus;
 
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
 /**
  * Creates and starts an indexer based on the provided
  * configuration file path.
@@ -804,3 +808,7 @@ void free_ffi_transaction_vec(struct FfiVec_FfiTransaction *val);
 bool is_ok(const enum OperationStatus *self);
 
 bool is_error(const enum OperationStatus *self);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus