bool dispatch_data_apply(
dispatch_data_t data,
dispatch_data_applier_t applier );
dispatch_data_t dispatch_data_copy_region(
dispatch_data_t data,
size_t location,
size_t *offset_ptr );
dispatch_data_t dispatch_data_create(
const void *buffer,
size_t size,
dispatch_queue_t queue,
dispatch_block_t destructor );
dispatch_data_t dispatch_data_create_concat(
dispatch_data_t data1,
dispatch_data_t data2 );
dispatch_data_t dispatch_data_create_map(
dispatch_data_t data,
const void **buffer_ptr,
size_t *size_ptr );
dispatch_data_t dispatch_data_create_subrange(
dispatch_data_t data,
size_t offset,
size_t length );