# Experimental C features

From cppreference.com
< c

The C standards committee publishes experimental C language and library extensions for future standardization.

Note: until 2012, these publications used the TR (technical report) format. Since 2012 ISO procedure changed to use the TS (technical specification) format.

ISO number | Name | Status | links
--- | --- | --- | ---
ISO/IEC TR 19769:2004 | Extensions to support new character data types | Published (ISO store) Final draft: N1040 (2003-11-07) ✔Merged into C11. |
ISO/IEC TR 24731-1:2007 | Bounds-checking interfaces | Published (ISO store) Final draft: N1225 (2007-03-28) ✔Merged into C11. |
ISO/IEC TR 18037:2008 | Extensions to support embedded processors | Published (ISO store) Final draft: N1169 (2006-04-04) |
ISO/IEC TR 24732:2009 | Extensions to support decimal floating-point arithmetic | Published (ISO store) Final draft: N1312 (2008-05-16) Superseded by TS 18661-2:2015 |
ISO/IEC 24747:2009 | Extensions to support mathematical special functions | Published (ISO store) Draft: N1182 (2006-08-02) |
ISO/IEC TR 24731-2:2010 | Extensions to support dynamic allocation functions | Published 2010-11-24 (ISO store) Draft: N1388 (2009-06-01) | dynamic
ISO/IEC TS 17961:2013 | Secure coding rules | Published 2013-11-15 (ISO store) Draft: N1718 (2013-05-30) TC1 published 2016-08-09 (ISO store) |
ISO/IEC TS 18661-1:2014 | Floating-point extensions: Binary floating-point arithmetic | Published 2014-07-21 (ISO store) Draft: N1778 (2013-11-05). C2x draft: N2314 (2018-11-12) ✔Merged into C23. | fpext1
ISO/IEC TS 18661-2:2015 | Floating-point extensions: Decimal floating-point arithmetic | Published 2015-02-11, Revised 2015-05-18 (ISO store). C2x draft: N2341 (2019-02-26) ✔Merged into C23. |
ISO/IEC TS 18661-3:2015 | Floating-point extensions: Interchange and extended types | Published 2015-10-06 (ISO store). Draft: N1945 (2015-06-10). C2x draft: N2601 (2020-10-15) ✔Merged into C23. |
ISO/IEC TS 18661-4:2015 | Floating-point extensions: Supplementary functions | Published 2015-10-06 (ISO store). Draft: N1950 (2015-06-10). C2x draft: N2401 (2019-06-23) ✔Partially merged into C23. | fpext4
ISO/IEC TS 18661-5:2016 | Floating-point extensions: Supplementary attributes | Published 2016-08-11 (ISO store) Draft: N2004 (2016-03-07) |
ISO/IEC TR 24772-3:2020 | Vulnerability descriptions for the programming language C | Published 2020-05-20 (ISO store) Draft: N2169 (2017-04-07) |
| Transactional Memory TS | Early draft: N1961 (2015-09-23) |
ISO/IEC TS 17961:xxxx | Secure coding rules part 2 | Early development, estimated publication 2023, possibly as an IS rather than TS |
ISO/IEC CD TS 6010 | A Provenance-aware Memory Object Model for C | Draft: N3057 (2023-01-29) |
ISO/IEC TS 21938-1 | Parallel extensions part 1: Thread-based parallelism | Early draft: N2170 (2017-09-21) ×(Abandoned) |
| Parallel extensions part 2: Vector-based parallelism | Early partial draft: N2081 (2016-09-15) ×(Abandoned) |

### See also

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