Allow creation of a Swift IndexStoreDB instance from an existing C++ IndexSystem type

Author: ahoppen

Sources/IndexStoreDB_CIndexStoreDB/CIndexStoreDB.cpp

@@ -176,6 +176,12 @@ indexstoredb_index_create(const char *storePath, const char *databasePath,
   return nullptr;
 }
 
+indexstoredb_index_t
+indexstoredb_index_create_from_existing(void *opaqueIndexSystem) {
+  std::shared_ptr<IndexSystem> *indexSystem = static_cast<std::shared_ptr<IndexSystem> *>(opaqueIndexSystem);
+  return make_object(*indexSystem);
+}
+
 void indexstoredb_index_add_delegate(indexstoredb_index_t index,
                                      indexstoredb_delegate_event_receiver_t delegateCallback) {
   auto delegate = std::make_shared<BlockIndexSystemDelegate>(delegateCallback);

Sources/IndexStoreDB_CIndexStoreDB/include/IndexStoreDB_CIndexStoreDB/CIndexStoreDB.h

@@ -224,6 +224,12 @@ indexstoredb_index_create(const char * _Nonnull storePath,
                   indexstoredb_creation_options_t _Nonnull options,
                   indexstoredb_error_t _Nullable * _Nullable);
 
+/// Create an `indexstoredb_index_t` from an existing `std::shared_ptr<IndexSystem>`.
+///
+/// `opaqueIndexSystem` must be a `std::shared_ptr<IndexSystem> *`.
+INDEXSTOREDB_PUBLIC _Nonnull indexstoredb_index_t
+indexstoredb_index_create_from_existing(void *_Nonnull opaqueIndexSystem);
+
 /// Add an additional delegate to the given index.
 INDEXSTOREDB_PUBLIC void
 indexstoredb_index_add_delegate(_Nonnull indexstoredb_index_t index,