Here are the classes, structs, unions and interfaces with brief descriptions:

Copendal_bytes	Opendal_bytes carries raw-bytes with its length
Copendal_capability	Capability is used to describe what operations are supported by current Operator
Copendal_entry	Opendal_list_entry is the entry under a path, which is listed from the opendal_lister
Copendal_error	The opendal error type for C binding, containing an error code and corresponding error message
Copendal_lister	BlockingLister is designed to list entries at given path in a blocking manner
Copendal_metadata	Carries all metadata associated with a path
Copendal_operator	Used to access almost all OpenDAL APIs. It represents an operator that provides the unified interfaces provided by OpenDAL
Copendal_operator_info	Metadata for operator, users can use this metadata to get information of operator
Copendal_operator_options	The configuration for the initialization of opendal_operator
Copendal_reader	The result type returned by opendal's reader operation
Copendal_result_exists	The result type returned by opendal_operator_exists()
Copendal_result_is_exist	The result type returned by opendal_operator_is_exist()
Copendal_result_list	The result type returned by opendal_operator_list()
Copendal_result_lister_next	The result type returned by opendal_lister_next(). The list entry is the list result of the list operation, the error field is the error code and error message. If the operation succeeds, the error should be NULL
Copendal_result_operator_new	The result type returned by opendal_operator_new() operation
Copendal_result_operator_reader	The result type returned by opendal_operator_reader(). The result type for opendal_operator_reader(), the field `reader` contains the reader of the path, which is an iterator of the objects under the path. the field `code` represents whether the stat operation is successful
Copendal_result_operator_writer	The result type returned by opendal_operator_writer(). The result type for opendal_operator_writer(), the field `writer` contains the writer of the path, which is an iterator of the objects under the path. the field `code` represents
Copendal_result_read	The result type returned by opendal's read operation
Copendal_result_reader_read	The is the result type returned by opendal_reader_read(). The result type contains a size field, which is the size of the data read, which is zero on error. The error field is the error code and error message
Copendal_result_stat	The result type returned by opendal_operator_stat()
Copendal_result_writer_write	The result type returned by opendal_writer_write(). The result type contains a size field, which is the size of the data written, which is zero on error. The error field is the error code and error message
Copendal_writer	The result type returned by opendal's writer operation