Experimental C features

 

C

Language

Headers

Type support

Program utilities

Variadic function support

Error handling

Dynamic memory management

Date and time utilities

Strings library

Algorithms

Numerics

Input/output support

Localization support

Atomic operations (C11)

Thread support (C11)

Technical Specifications

 

C language

Basic concepts

Keywords

Preprocessor

Statements

Expressions

Initialization

Declarations

Functions

Miscellaneous

History of C

Technical Specifications

 

Technical Specifications

Extensions for embedded processors

Dynamic memory extensions

Floating-point extensions part 1: Binary floating-point

Floating-point extensions part 4: Supplementary functions

 

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to support to support decimal floating-point arithmetic	Published (ISO store) Final draft: n1241 (2007-07-05) Superseded by TS 18661-2:2015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: n1624 (2012-06-26) 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 AWI TS 6010	A Provenance-aware Memory Object Model for C	Early draft: n2676 (2021-03-24)
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)