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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/experimental.html below:

Experimental C++ Features - cppreference.com

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.

[edit] TR/TS specifications ISO number Name Status Links, headers 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).
âMerged into C++17.

Special functions (experimental), 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May be superseded by a future TS or merged into a future revision of C++ (most recent merge proposal was N3871).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).

âMerged into C++17.

Filesystem (experimental), Filesystem, <filesystem> ISO/IEC TS 19570:2015 C++ Extensions for Parallelism Published 2015-06-24. (ISO Store). Final draft: N4507 (2015-05-05).

âMerged 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).

âMerged 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).

âMerged into C++20 (with modifications).

Constraints and concepts (experimental), Concepts, <concepts> ISO/IEC TS 19571:2016 C++ Extensions for Concurrency Published 2016-01-19 (ISO Store). Final draft: P0159R0 (2015-10-22).

âPartially 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).

âPartially 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).

âMerged into C++20.

Ranges (experimental), Ranges, <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).

âMerged into C++20.

<coroutine> ISO/IEC TS 19216:2018 Networking TS Published 2018-04-24 (ISO Store). Draft: N4734 (2017-04-04). Latest draft: N4771 (2018-10-08). See also non-TS proposals

Standard Secure Networking - P2586R0 (2022-09-13)
Sender-Receiver Interface For Networking - P2762R2 (2023-10-12)
A proposed direction for C++ Standard Networking based on IETF TAPS - P3185R0 (2024-12-14)
Proposed API for creating TAPS based networking connections - P3482R0 (2024-12-14)

Networking ISO/IEC TS 21544:2018 Modules TS Published 2018-05-16 (ISO Store). Final Draft: N4720 (2018-01-29).

âMerged 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). See also non-TS std::simd proposals below. Parallelism 2 ISO/IEC TS 23619:2021 Reflection TS Published 2021-10-11 (ISO store). Draft: N4856 (2020-03-02). See also non-TS proposals below. Reflection Numerics Early development. Draft: P1889R1 (2019-12-27). ISO/IEC TS 9922 Concurrency TS Version 2 Published 2024-10-09 (ISO Store). Draft: N4956 (2023-07-05). Concurrency 2 ISO/IEC TS 19568:2024 C++ Extensions for Library Fundamentals, Version 3 Published 2024-08-26 (ISO Store). Draft: N4948 (2023-05-08). Library extensions 3 ISO/IEC DTS 12907 Transactional Memory TS, Version 2 Early development. Draft: N4923 (2022-10-14). ISO/IEC NP 19569 Array Extensions TS Ã Withdrawn. Abandoned draft: N3820 (2013-10-10). [edit] Non-TS proposals Name Status Links, Headers Linear Algebra âMerged into C++26. Proposal: P1673R13 (2023-11-10). More proposals:

A proposal to add linear algebra support to the C++ standard library - P1385R7 (2022-10-15)
Evolving a Standard C++ Linear Algebra Library from the BLAS - P1674R2 (2022-05-15)
Presentation of P1385R7 to LEWG at Issaquah 2023 - P2802R0 (2023-02-09)
Fix C++26 by optimizing linalg::conjugated for non-complex value types - P3050R3 (2024-10-29)
Fix C++26 by making the symmetric and Hermitian rank-k and rank-2k updates consistent with the BLAS - P3371R4 (2025-04-07)

<linalg> std::execution âMerged into C++26. Proposal: P2300R10 (2024-06-28). More proposals:

System execution context - P2079R8 (2025-05-18)
Sender-Receiver Interface for Networking - P2762R2 (2023-10-12)
Member customization points for Senders and Receivers - P2855R1 (2024-02-22)
An Event Model for C++ Executors - P2882R0 (2023-05-11)
Sender Algorithm Customization - P2999R3 (2023-12-13)
std::execution introduction - P3090R0 (2024-02-14)
A plan for std::execution for C++26 - P3109R0 (2024-02-12)
Improving diagnostics for Sender expressions - P3164R4 (2025-04-28)
Reconsidering the std::execution::on algorithm - P3175R3 (2024-06-25)
A sender query for completion behaviour - P3206R0 (2025-01-13)
finally, write_env, and unstoppable Sender Adaptors - P3284R4 (2025-05-16)
Fixing Lazy Sender Algorithm Customization - P3303R1 (2024-06-25)
A Utility for Creating Execution Environments - P3325R5 (2024-11-22)
When Do You Know connect Doesn't Throw? - P3388R2 (2025-04-01)
std::execution wording fixes - P3396R1 (2024-11-19)
Enabling more efficient stop-token based cancellation of senders - P3409R1 (2024-11-17)
system_scheduler on Win32, Darwin and Linux - P3456R0 (2024-10-15)
Summarizing std::execution::bulk() issues - P3481R3 (2025-04-16)
High-Quality Sender Diagnostics with Constexpr Exceptions - P3557R2 (2025-05-16)
optional variants in sender-receiver - P3570R1 (2025-05-19)
Non-Blocking Support for std::execution - P3669R1 (2025-05-17)
Remove std::execution::split - P3682R0 (2025-05-06)
Rename async_scope_token - P3685R0 (2025-05-07)
Rename join and nest in async_scope proposal - P3706R0 (2025-05-19)

Execution (experimental),
Execution,
<execution> std::inplace_vector âMerged into C++26. Proposal: P0843R14 (2024-06-26). More proposals:

inplace_vector - P0843(R7) LEWG presentation - P2925R0 (2023-06-16)
A direction for Vector - P3147R1 (2024-03-18)
An allocator-aware std::inplace_vector - P3160R2 (2024-10-15)
No, inplace_vector shouldn't have an Allocator - P3581R0 (2025-01-13)
LEWG Hagenberg presentation for P3581. No, inplace_vector shouldn't have an Allocator - P3636R0 (2025-02-13)
Cross-capacity comparisons for std::inplace_vector - P3698R0 (2025-05-19)

<inplace_vector> experimental::simd
std::datapar::simd âMerged into C++26. Proposal: P1928R15 (2024-11-22).
The main document (TS ISO/IEC 19570:2018) is described in "C++ Extensions for Parallelism V2" above. More proposals:

Expected Feedback from SIMD in Parallelism TS2 - P1915R0 (2019-10-07)
Intel's response to std::simd - P2638R0 (2022-09-22)
Proposal to support interleaved complex values in std::simd - P2663R7 (2025-02-17)
Proposal to extend std::simd with permutation API - P2664R10 (2025-05-19)
std::simd Intro slides - P2803R0 (2023-02-09)
Issaquah Slides for Intel response to std::simd - P2807R0 (2023-02-10)
Proposal to extend std::simd with more constructors and accessors - P2876R2 (2025-02-14)
Algorithm-like vs std::simd based RNG API - P2880R0 (2023-05-18)
std::simd types should be regular - P2892R0 (2023-05-19)
std::simd types should be regular - P2892R0 LEWG presentation - P2926R0 (2023-06-19)
simd_invoke - P2929R0 (2023-07-19)
std::simd overloads for <bit> - P2933R4 (2025-02-17)
Add saturating library support to std::simd - P2956R1 (2025-05-19)
Allowing user-defined types in std::simd - P2964R1 (2024-05-22)
Interface Directions for std::simd - P3024R0 (2023-11-30)
Provide predefined std::simd permute generator functions for common operations - P3067R0 (2024-05-22)
Replace std::simd operator[] with getter and setter functions - or not - P3275R0 (2024-05-22)
Exploration of namespaces for std::simd - P3287R3 (2025-02-13)
Range constructors for std::simd - P3299R3 (2024-12-17)
Add an iota object for std::simd (and more) - P3319R5 (2025-02-14)
std::simd issues: explicit, unsequenced, identity-element position, and members of disabled simd - P3430R3 (2025-02-13)
Add n_elements named constructor to std::simd - P3440R0 (2024-10-15)
Rename simd_split to simd_chunk - P3441R2 (2025-01-30)
Add utilities for easier type-bit casting in std::simd - P3445R0 (2024-10-16)
std::simd is a range - P3480R5 (2025-05-15)
Consistency fix: Make simd reductions SIMD-generic - P3690R0 (2025-05-13)
Reconsider naming of the namespace for std::simd - P3691R0 (2025-05-19)

Data parallel types (experimental),
Data parallel types,
<simd> Contracts âMerged into C++26. Proposal: Contracts for C++ - P2900R14 (2025-02-13)
More proposals:

A Proposal to Publish a Technical Specification for Contracts - P2659R2 (2022-11-30)
Proposed Contracts TS - P2660R0 (2022-10-14)
Miscellaneous amendments to the Contracts TS - P2661R0 (2022-10-15)
Contracts for C++: Prioritizing Safety - P2680R1 (2022-12-15)
A proposed plan for contracts in C++ - P2695R1 (2023-02-09)
Proposal of Condition-centric Contracts Syntax - P2737R0 (2022-12-30)
Contracts for C++: Prioritizing Safety - Presentation slides - P2743R0 (2022-12-13)
Evaluation of Checked Contracts - P2751R1 (2023-02-14)
A Bold Plan for a Complete Contracts Facility - P2755R1 (2024-04-11)
The idea behind the contracts MVP - P2817R0 (2023-03-05)
Proposal of Contracts Supporting Const-On-Definition Style - P2829R0 (2023-04-13)
Contract violation handling semantics for the contracts MVP - P2852R0 (2023-04-24)
The Lakos Rule: Narrow Contracts and noexcept Are Inherently Incompatible - P2861R0 (2023-05-19)
Requirements for a Contracts syntax - P2885R3 (2023-10-05)
Contracts on lambdas - P2890R2 (2023-12-13)
Constant evaluation of Contracts - P2894R2 (2024-01-11)
Outstanding design questions for the Contracts MVP - P2896R0 (2023-08-22)
Contracts for C++ - Rationale - P2899R1 (2025-03-14)
A Principled Approach to Open Design Questions for Contracts - P2932R3 (2024-01-16)
An Attribute-Like Syntax for Contracts - P2935R4 (2023-11-05)
Contracts must avoid disclosing sensitive information - P2947R0 (2023-07-20)
Slides for P2861R0: Narrow Contracts and noexcept are Inherently Incompatible - P2949R0 (2023-07-14)
Contracts and virtual functions for the Contracts MVP - P2954R0 (2023-08-03)
Contracts and coroutines - P2957R2 (2024-10-14)
A natural syntax for Contracts - P2961R2 (2023-11-08)
An Overview of Syntax Choices for Contracts - P3028R0 (2023-11-05)
Protection against modifications in contracts - P3071R1 (2023-12-17)
Remove evaluation_undefined_behavior and will_continue from the Contracts MVP - P3073R0 (2024-01-27)
Should ignore and observe exist for constant evaluation of contracts? - P3079R0 (2024-01-11)
Contracts for C++: Support for virtual functions - P3097R0 (2024-04-15)
Contracts for C++: Postcondition captures - P3098R1 (2024-12-11)
Undefined and erroneous behavior are contract violations - P3100R2 (2025-05-19)
Tokyo Technical Fixes to Contracts - P3119R1 (2024-05-09)
Contracts on virtual functions for the Contracts MVP - P3165R0 (2024-02-27)
Inherited contracts - P3169R0 (2024-04-14)
Contract testing support - P3183R1 (2024-05-22)
Slides for LEWG presentation of P2900R6: Contracts for C++ - P3189R0 (2024-03-19)
Slides for LEWG presentation of P2900R7: Contracts for C++ - P3190R0 (2024-03-20)
A response to the Tokyo EWG polls on the Contracts MVP (P2900R6) - P3197R0 (2024-04-12)
A takeaway from the Tokyo LEWG meeting on Contracts MVP - P3198R0 (2024-03-29)
Why Contracts? - P3204R0 (2024-11-07)
The contract of sort() - P3212R0 (2024-07-03)
Contracts for C++: Naming the Louis semantic - P3226R0 (2024-04-12)
Contracts for C++: Fixing the contract violation handling API - P3227R1 (2024-10-24)
Contracts for C++: Revisiting contract check elision and duplication - P3228R1 (2024-05-21)
Making erroneous behaviour compatible with Contracts - P3229R1 (2025-02-10)
An alternate proposal for naming contract semantics - P3238R0 (2024-05-06)
A unified syntax for Pattern Matching and Contracts when introducing a new name - P3249R0 (2024-05-22)
C++ contracts with regards to function pointers - P3250R0 (2024-05-07)
C++ contracts and coroutines - P3251R0 (2024-05-07)
Make the predicate of contract_assert more regular - P3257R0 (2024-04-26)
Ship Contracts in a TS - P3265R3 (2024-05-28)
Approaches to C++ Contracts - P3267R1 (2024-05-22)
C++ Contracts Constification Challenges Concerning Current Code - P3268R0 (2024-05-07)
Do Not Ship Contracts as a TS - P3269R0 (2024-05-21)
Repetition, Elision, and Constification w.r.t. contract_assert - P3270R0 (2024-05-22)
Function Usage Types (Contracts for Function Pointers) - P3271R1 (2024-10-15)
P2900 Is Superior to a Contracts TS - P3276R0 (2024-05-18)
Contracts: Protecting The Protector - P3285R0 (2024-05-15)
Integrating Existing Assertions With Contracts - P3290R2 (2024-09-06)
C++26 Needs Contract Checking - P3297R1 (2024-06-21)
An opt-in approach for integration of traditional assert facilities in C++ contracts - P3311R0 (2024-05-22)
Compile time resolved contracts - P3317R0 (2024-05-22)
Contracts Interaction With Tooling - P3321R0 (2024-07-12)
Contract assertions on function pointers - P3327R0 (2024-10-16)
Observable Checkpoints During Contract Evaluation - P3328R0 (2024-06-14)
Usage Experience for Contracts with BDE - P3336R0 (2024-06-23)
Contracts - What are we doing here (EWG Presentation) - P3343R0 (2024-06-25)
Virtual Functions on Contracts (EWG - Presentation for P3097) - P3344R0 (2024-06-28)
Class invariants and contract checking philosophy - P3361R1 (2024-07-23)
Static analysis and âsafetyâ of Contracts, P2900 vs P2680/P3285 - P3362R0 (2024-08-13)
Contract assertions versus static analysis and âsafetyâ - P3376R0 (2024-10-14)
Static Analysis of Contracts with P2900 - P3386R1 (2024-11-25)
Contract assertions on coroutines - P3387R0 (2024-10-09)
Specifying Contract Assertion Properties with Labels - P3400R1 (2025-02-28)
Improving the handling of exceptions thrown from contract predicates - P3417R1 (2025-03-05)
Contracts Implementors Report - P3460R0 (2024-10-16)
Standard library hardening - P3471R4 (2025-02-14)
Constification should not be part of the MVP (Minimal Viable Product) - P3478R0 (2024-10-16)
Exploring strict contract predicates - P3499R1 (2025-02-09)
Are Contracts 'safe'? - P3500R1 (2025-02-09)
Slides for P2900R11 - Contracts for C++ - P3502R0 (2024-11-18)
P2900 Is Still not Ready for C++26 - P3506R0 (2025-01-13)
Violation handlers vs noexcept - P3541R1 (2025-01-07)
Core Language Contracts By Default - P3558R1 (2025-02-03)
Contract concerns - P3573R0 (2025-01-12)
Require a non-throwing default contract-violation handler - P3577R0 (2025-01-12)
Observed a contract violation? Skip subsequent assertions! - P3582R0 (2025-01-13)
Contracts, Types & Functions - P3583R0 (2025-01-13)
Contextualizing Contracts Concerns - P3591R0 (2025-02-03)
Initial Implicit Contract Assertions - P3599R0 (2025-02-03)
Contracts and profiles: what can we reasonably ship in C++26 - P3608R0 (2025-02-01)
Remove contracts on virtual functions for now - P3616R0 (2025-02-08)
Make contracts reliable by default - P3640R0 (2025-03-17)
Minor additions to C++26 standard library hardening - P3697R0 (2025-05-16)

Contract assertions,
function contract specifiers,
contract_assert,
pre, post,
<contracts> Reflection The main document (ISO/IEC TS 23619:2021) is described in Reflection TS above. More proposals:

Scalable Reflection in C++ - P1240R2 (2022-01-14)
Expansion statements - P1306R4 (2025-05-17)
Reflection on attributes - P1887R1 (2020-01-13)
Metaprogramming - P2237R0 (2020-10-15)
Python Bindings with Value-Based Reflection - P2911R1 (2023-10-13)
Reflection for C++26 - P2996R12 (2025-05-17)
Using Reflection to Replace a Metalanguage for Generating JS Bindings - P3010R0 (2023-10-13)
ABI comparison with reflection - P3095R0 (2024-02-15)
Function Parameter Reflection in Reflection for C++26 - P3096R9 (2025-05-15)
Generative Extensions for Reflection - P3157R1 (2024-05-22)
Syntax for Reflection - P3381R0 (2024-09-17)
Attributes reflection - P3385R5 (2025-05-19)
Annotations for Reflection - P3394R3 (2025-05-17)
Reflection Syntax Options Summary - P3419R0 (2024-10-11)
Reflection of Templates - P3420R1 (2025-01-13)
Reflection header should minimize standard library dependencies - P3429R1 (2024-11-29)
Reflection and meta-programming - P3435R0 (2024-10-14)
Proposed default principles: Reflect C++, Generate C++ - P3437R1 (2024-11-07)
Reflection on SG21 2024 Process - P3443R0 (2024-10-14)
A Suggestion for Reflection Access Control - P3451R0 (2024-10-15)
Ruminations on reflection and access - P3493R0 (2024-11-10)
Modeling Access Control With Reflection - P3547R1 (2025-02-09)
Error Handling in Reflection - P3560R1 (2025-05-19)
Split define_aggregate from Reflection - P3569R0 (2025-01-11)
Reconsider reflection access for C++26 - P3587R0 (2025-01-13)
Do not remove nor postpone access_context::unchecked - P3614R0 (2025-02-06)
std::meta::reflect_constant_{array,string} - P3617R0 (2025-05-16)
Inherit std::meta::exception from std::exception - P3637R0 (2025-03-08)
Final Adjustments to C++26 Reflection - P3687R0 (2025-05-15)

Reflection (experimental) Pattern Matching Early development. Draft P1371R3 (2020-09-15). More proposals:

Pattern Matching using is and as - P2392R3 (2024-10-16)
Pattern Matching: match expression - P2688R5 (2025-01-13)
switch for Pattern Matching - P2940R0 (2022-04-18)
Identifiers for Pattern Matching - P2941R0 (2022-02-24)
A Postcondition is a Pattern Match - P3210R2 (2024-09-10)
A unified syntax for Pattern Matching and Contracts when introducing a new name - P3249R0 (2024-05-22)
A simpler notation for PM - P3332R0 (2024-06-18)
Slides for P2688R2 - Pattern Matching: match Expression - P3476R0 (2024-10-16)
Pattern Matching: Customization Point for Open Sum Types - P3521R0 (2024-12-17)
Pattern Matching: *variant-like* and 'std::expected' - P3527R1 (2025-01-13)
Pattern matching - P3572R0 (2025-01-12)

Profiles Early development. More proposals:

Safety Profiles: Type-and-resource Safe programming in ISO Standard C+ - P2816R0 (2023-02-16)
Concrete suggestions for initial Profiles - P3038R0 (2023-12-16)
Core safety Profiles: Specification, adoptability, and impact - P3081R2 (2025-02-03)
A framework for Profiles development - P3274R0 (2024-05-10)
A Safety Profile Verifying Class Initialization - P3402R3 (2025-05-17)
Profile invalidation - eliminating dangling pointers - P3446R0 (2024-10-14)
Profiles syntax - P3447R0 (2024-10-14)
Response to Core Safety Profiles (P3081R0) - P3543R0 (2024-12-17)
The Plethora of Problems With Profiles - P3586R0 (2025-01-13)
C++ Profiles: The Framework - P3589R2 (2025-05-19)
Contracts and profiles: what can we reasonably ship in C++26 - P3608R0 (2025-02-01)
Dealing with pointer errors: Separating static and dynamic checking - P3611R0 (2025-02-04)
Easy-to-adopt security profiles for preventing RCE (remote code execution) in existing C++ code - P3627R0 (2025-02-11)
A principled approach to safety profiles - P3649R0 (2025-05-19)
21st Century C++ - P3650R0 (2025-03-05)
Note to the C++ standards committee members - P3651R0 (2025-03-06)
Making Safe C++ happen - P3700R0 (2025-05-19)
What are profiles? - P3704R0 (2025-05-19)

Statistics Early development. More proposals:

Basic Statistics - P1708R9 (2024-10-15)
Remarks on Basic Statistics, P1708R9 - P3495R0 (2024-11-13)

Graph Library Early development. More proposals:

Graph Library: Overview - P3126R3 (2025-04-13)
Graph Library: Algorithms - P3128R3 (2025-04-13)
Graph Library: Graph Container Interface - P3130R3 (2025-04-13)
Graph Library: Graph Containers - P3131R3 (2025-04-13)

2D Graphics Early development. Draft P0267R10 (2019-10-07). [edit] See also [edit] External links

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