# Experimental C++ Features

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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 18015:2006 | Technical Report on C++ Performance | Published 2006 (ISO store). Draft: TR18015 (2006-02-15). |
ISO/IEC TR 19768:2007 | Technical Report on C++ Library Extensions | Published 2007-11-15 (ISO store). Draft: N1836 (2005-06-24) ISO 29124 split off, the rest merged into C++11. |
ISO/IEC 29124:2010 | Extensions to the C++ Library to support mathematical special functions | Published 2010-09-03 (ISO Store). Final draft: N3060 (2010-03-06). ✔Merged into C++17. | special functions
ISO/IEC TR 24733:2011 | Extensions for the programming language C++ to support decimal floating-point arithmetic | Published 2011-10-25 (ISO Store) Draft: N2849 (2009-03-06). May be superseded by a future TS or merged into a future revision of C++ (most recent merge proposal was N3871). |
ISO/IEC TS 18822:2015 | C++ File System Technical Specification | Published 2015-06-18 (ISO store). Final draft: N4100 (2014-07-04). ✔Merged into C++17. | filesystem
ISO/IEC TS 19570:2015 | C++ Extensions for Parallelism | Published 2015-06-24. (ISO Store). Final draft: N4507 (2015-05-05). ✔Merged into C++17. | parallelism
ISO/IEC TS 19841:2015 | Transactional Memory TS | Published 2015-09-16, (ISO Store). Final draft: N4514 (2015-05-08). | transactional memory
ISO/IEC TS 19568:2015 | C++ Extensions for Library Fundamentals | Published 2015-09-30, (ISO Store). Final draft: N4480 (2015-04-07). ✔Merged into C++17 except for invocation traits. | library extensions
ISO/IEC TS 19217:2015 | C++ Extensions for Concepts | Published 2015-11-13 (ISO Store). Final draft: N4553 (2015-10-02). Current draft: P0734R0 (2017-07-14). ✔Merged into C++20 (with modifications). | constraints and concepts
ISO/IEC TS 19571:2016 | C++ Extensions for Concurrency | Published 2016-01-19 (ISO Store). Final draft: P0159R0 (2015-10-22). ✔Partially merged into C++20. | concurrency
ISO/IEC TS 19568:2017 | C++ Extensions for Library Fundamentals, Version 2 | Published 2017-03-30 (ISO Store). Draft: N4617 (2016-11-28). ✔Partially merged into C++17 and C++20. | library extensions 2
ISO/IEC TS 21425:2017 | Ranges TS | Published 2017-12-05 (ISO Store). Draft: N4685 (2017-07-31). ✔Merged into C++20. | ranges
ISO/IEC TS 22277:2017 | Coroutines TS | Published 2017-12-05 (ISO Store). Draft N4736 (2018-03-31). Latest draft: N4775 (2018-10-07). ✔Merged into C++20. |
ISO/IEC TS 19216:2018 | Networking TS | Published 2018-04-24 (ISO Store). Draft N4734 (2017-04-04). Latest draft: N4771 (2018-10-08). | networking
ISO/IEC TS 21544:2018 | Modules TS | Published 2018-05-16 (ISO Store). Final Draft N4720 (2018-01-29). ✔Merged into C++20. |
ISO/IEC TS 19570:2018 | Parallelism TS Version 2 | Published 2018-11-15 (ISO Store). Final draft: N4793 (2018-11-26). Post-publication draft: N4808 (2019-03-11). | parallelism 2
ISO/IEC TS 23619:2021 | Reflection TS | Published 2021-10-11 (ISO store). Draft N4856 (2020-03-02). Alternative draft P1240R2 (2022-01-15). | reflection
| Numerics | Early development. Draft P1889R1 (2019-12-27). |
ISO/IEC AWI TS 9922 | Concurrency TS Version 2 | Early development. Draft N4953 (2023-05-15). | concurrency 2
ISO/IEC AWI TS 19568 | C++ Extensions for Library Fundamentals, Version 3 | Early development. Draft N4948 (2023-05-08). | library extensions 3
ISO/IEC DTS 12907 | Transactional Memory TS, Version 2 | Early development: N4923 (2022-10-14). |
| Pattern Matching | Early development. Draft P1371R3 (2020-09-15). |
| Linear Algebra | Early development; now targeting mainline standard P1673R12 (2023-03-14), P1674R2 (2022-05-15), P1385R7 (2022-10-15). |
| Contracts | Early development. Proposal P2659R2 (2022-11-30). Draft P2660R0 (2022-10-14). |
| 2D Graphics | Early development. Draft P0267R10 (2019-10-07). |
ISO/IEC NP 19569 | Array Extensions TS | × Withdrawn. Abandoned draft: N3820 (2013-10-10). |

### See also

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