# Compatibility Features

This appendix describes features of Intel Threading Building Blocks (Intel® TBB) that remain for compatibility with previous versions. These features are deprecated and may disappear in future versions of Intel® TBB. Some of these features are available only if the preprocessor symbol TBB_DEPRECATED is non-zero.

Parent topic: Appendices

- parallel_while Template Class
- Interface for constructing a pipeline filter
- Debugging Macros
- tbb::deprecated::concurrent_queue<T,Alloc> Template Class
- Interface for concurrent_vector
- Interface for class task
- tbb_thread Class