tore ](https://www.iso.org/standard/64031.html) ). Final draft: [ N4553 ](https://wg21.link/n4553) (2015-10-02). Current draft: [ P0734R0 ](https://wg21.link/p0734r0) (2017-07-14).   
**✔** [ Merged into C++20 ](/w/cpp/language/constraints "cpp/language/constraints") (with modifications).  |  [ constraints and concepts ](/w/cpp/experimental/constraints "cpp/experimental/constraints")  
ISO/IEC TS 19571:2016  |  C++ Extensions for Concurrency  |  Published 2016-01-19 ( [ ISO Store ](https://www.iso.org/standard/65242.html) ). Final draft: [ P0159R0 ](https://wg21.link/p0159r0) (2015-10-22).   
**✔** Partially merged into C++20.  |  [ concurrency ](/w/cpp/experimental/concurrency "cpp/experimental/concurrency")  
ISO/IEC TS 19568:2017  |  C++ Extensions for Library Fundamentals, Version 2  |  Published 2017-03-30 ( [ ISO Store ](https://www.iso.org/standard/70587.html) ). Draft: [ N4617 ](https://wg21.link/n4617) (2016-11-28).   
**✔** Partially merged into C++17 and C++20.  |  [ library extensions 2 ](/w/cpp/experimental/lib_extensions_2 "cpp/experimental/lib extensions 2")  
ISO/IEC TS 21425:2017  |  Ranges TS  |  Published 2017-12-05 ( [ ISO Store ](https://www.iso.org/standard/70910.html) ). Draft: [ N4685 ](https://wg21.link/n4685) (2017-07-31).   
**✔** [ Merged into C++20 ](/w/cpp/ranges "cpp/ranges") .  |  [ ranges ](/w/cpp/experimental/ranges "cpp/experimental/ranges")  
ISO/IEC TS 22277:2017  |  Coroutines TS  |  Published 2017-12-05 ( [ ISO Store ](https://www.iso.org/standard/73008.html) ). Draft [ N4736 ](https://wg21.link/n4736) (2018-03-31). Latest draft: [ N4775 ](https://wg21.link/n4775) (2018-10-07).   
**✔** [ Merged into C++20 ](/w/cpp/coroutine "cpp/coroutine") .  |   
ISO/IEC TS 19216:2018  |  Networking TS  |  Published 2018-04-24 ( [ ISO Store ](https://www.iso.org/standard/64030.html) ). Draft [ N4734 ](https://wg21.link/n4734) (2017-04-04). Latest draft: [ N4771 ](https://wg21.link/n4771) (2018-10-08).  |  [ networking ](/w/cpp/experimental/networking "cpp/experimental/networking")  
ISO/IEC TS 21544:2018  |  Modules TS  |  Published 2018-05-16 ( [ ISO Store ](https://www.iso.org/standard/71051.html) ). Final Draft [ N4720 ](https://wg21.link/n4720) (2018-01-29).   
**✔** [ Merged into C++20 ](/w/cpp/language/modules "cpp/language/modules") .  |   
ISO/IEC TS 19570:2018  |  Parallelism TS Version 2  |  Published 2018-11-15 ( [ ISO Store ](https://www.iso.org/standard/70588.html) ). Final draft: [ N4793 ](https://wg21.link/n4793) (2018-11-26).  Post-publication draft: [ N4808 ](https://wg21.link/n4808) (2019-03-11).  |  [ parallelism 2 ](/w/cpp/experimental/parallelism_2 "cpp/experimental/parallelism 2")  
ISO/IEC TS 23619:2021  |  Reflection TS  |  Published 2021-10-11 ( [ ISO store ](https://www.iso.org/standard/76425.html) ). Draft [ N4856 ](https://wg21.link/n4856) (2020-03-02). Alternative draft [ P1240R2 ](https://wg21.link/p1240r2) (2022-01-15).  |  [ reflection ](/w/cpp/experimental/reflect "cpp/experimental/reflect")  
|  Numerics  |  Early development. Draft [ P1889R1 ](https://wg21.link/p1889r1) (2019-12-27).  |   
ISO/IEC AWI TS 9922  |  Concurrency TS Version 2  |  Early development. Draft [ N4953 ](https://wg21.link/n4953) (2023-05-15).  |  [ concurrency 2 ](/mwiki/index.php?title=cpp/experimental/concurrency_2&action=edit&redlink=1 "cpp/experimental/concurrency 2 \(page does not exist\)")  
ISO/IEC AWI TS 19568  |  C++ Extensions for Library Fundamentals, Version 3  |  Early development. Draft [ N4948 ](https://wg21.link/n4948) (2023-05-08).  |  [ library extensions 3 ](/w/cpp/experimental/lib_extensions_3 "cpp/experimental/lib extensions 3")  
ISO/IEC DTS 12907  |  Transactional Memory TS, Version 2  |  Early development: [ N4956 ](https://wg21.link/n4956) (2023-07-05).  |   
|  Pattern Matching  |  Early development. Draft [ P1371R3 ](https://wg21.link/p1371r3) (2020-09-15).  |   
|  Linear Algebra  |  Now targeting mainline standard [ P1673R13 ](https://wg21.link/p1673r13) (2023-11-10),