rb_define_method(notmuch_rb_cDirectory, "mtime", notmuch_rb_directory_get_mtime, 0);
rb_define_method(notmuch_rb_cDirectory, "mtime=", notmuch_rb_directory_set_mtime, 1);
rb_define_method(notmuch_rb_cDirectory, "child_files", notmuch_rb_directory_get_child_files, 0);
rb_define_method(notmuch_rb_cDirectory, "child_directories", notmuch_rb_directory_get_child_directories, 0);
rb_define_method(notmuch_rb_cDirectory, "mtime", notmuch_rb_directory_get_mtime, 0);
rb_define_method(notmuch_rb_cDirectory, "mtime=", notmuch_rb_directory_set_mtime, 1);
rb_define_method(notmuch_rb_cDirectory, "child_files", notmuch_rb_directory_get_child_files, 0);
rb_define_method(notmuch_rb_cDirectory, "child_directories", notmuch_rb_directory_get_child_directories, 0);