Experimental C++ Features

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Execution support library (C++26)

Technical specifications

Symbols index

External libraries

 

Experimental

Technical Specification

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals TS v2)

Library fundamentals 3 (library fundamentals TS v3)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Extensions for concurrency 2 (concurrency TS v2)

Concepts (concepts TS)

Ranges (ranges TS)

Reflection (reflection TS)

Mathematical special functions (special functions TR)

Experimental Non-TS

Pattern Matching

Linear Algebra

std::execution

Contracts

2D Graphics

 

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 May be superseded by a future TS or merged into a future revision of C++ (most recent merge proposal was N3871).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: N4956 (2023-07-05).
	Pattern Matching	Early development. Draft P1371R3 (2020-09-15).
	Linear Algebra	Now targeting mainline standard P1673R12 (2023-03-14), P1674R2 (2022-05-15), P1385R7 (2022-10-15). ✔Merged into C++26 (P1673R12).
	std::execution	Forwarded to LWG, wording in progress. Proposal P2300R7 (2023-04-21).
	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

C documentation for Experimental C features