C++26

 

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

 

Versions

C++98

C++03

C++11

C++14

C++17

C++20

C++23

C++26

Current Status

 

The next generation of the C++ standard.

See: The current IS schedule for C++26 (2024-05-14).

New library features

New headers

• <debugging>
• <hazard_pointer>
• <inplace_vector>
• <linalg>
• <rcu>
• <simd>
• <text_encoding>

C compatibility headers:

• <stdbit.h>
• <stdchkint.h>

Compiler support

Main Article: C++26 compiler support

C++26 core language features

C++26 feature	Paper(s)	GCC	Clang	MSVC	Apple Clang	EDG eccp	Intel C++	Nvidia HPC C++ (ex PGI)*	Nvidia nvcc	Cray
DR98: Removing undefined behavior from lexing	P2621R3	Yes	3.3
DR98: Making non-encodable string literals ill-formed	P1854R4	14	14
Unevaluated strings	P2361R6	14	17 (partial)* 18
Adding @, $, and ` to the basic character set	P2558R2	15	Yes
constexpr cast from void*	P2738R1	14	17
DR20: On the ignorability of standard attributes	P2552R3		Yes
DR11: Static storage for braced initializers	P2752R3	14
User-generated static_assert messages	P2741R3	14	17
Placeholder variables with no name	P2169R4	14	18
Pack indexing	P2662R3	15	19
Removing deprecated arithmetic conversion on enumerations	P2864R2	14	18
DR11/20: Template parameter initialization	P2308R1		18
Disallow binding a returned reference to a temporary	P2748R5	14	19
Attributes for structured bindings	P0609R3	15	19
Erroneous behavior for uninitialized reads	P2795R5
= delete("reason");	P2573R2	15	19
Variadic friends	P2893R3	15	20
DR98: Clarifying rules for brace elision in aggregate initialization	P3106R1	Yes	17
DR20: Disallow module declarations to be macros	P3034R1	15
DR11: Trivial infinite loops are not undefined behavior	P2809R3	14	19
constexpr placement new	P2747R2	15	20
Structured binding declaration as a condition	P0963R3	15	6 (partial)*
Ordering of constraints involving fold expressions	P2963R3		19
Deleting a pointer to an incomplete type should be ill-formed	P3144R2	15	19
Structured bindings can introduce a pack	P1061R10
constexpr structured bindings and references to constexpr variables	P2686R5
constexpr exceptions	P3068R6
Oxford variadic comma	P3176R1	15	20
Removing deprecated array comparisons	P2865R5	15
C++26 feature	Paper(s)	GCC	Clang	MSVC	Apple Clang	EDG eccp	Intel C++	Nvidia HPC C++ (ex PGI)*	Nvidia nvcc	Cray

C++26 library features

C++26 feature	Paper(s)	GCC libstdc++	Clang libc++	MSVC STL	Apple Clang*
Testing for success or failure of <charconv> functions	P2497R0	14	18
std::text_encoding: text encodings identification	P1885R12 P2862R1	14
Arithmetic overloads of std::to_string and std::to_wstring use std::format	P2587R3	14
Type checking format args	P2757R3	15
Formatting pointers	P2510R3	14*	17*	19.40**
Hashing support for std::chrono value classes	P2592R3
Read-Copy Update	P2545R4
Hazard Pointers	P2530R3
ADL-proof std::projected	P2538R1	14*	18*	19.38**
constexpr stable sorting	P2562R1
Member visit	P2637R3	15	18 (partial)* 19
std::is_within_lifetime	P2641R4
Extending associative containers with the remaining heterogeneous overloads	P2363R5
Enabling the use of std::weak_ptr as keys in unordered associative containers	P1901R2
Native handles in file streams	P1759R6	14	18
Interfacing string streams with std::string_view	P2495R3		19
Interfacing std::bitset with std::string_view	P2697R1		18
More constexpr for <cmath> and <complex>	P1383R2	4.6 (partial)*
Adding the new 2022 SI prefixes on ratios: std::quecto, std::ronto, std::ronna, and std::quetta	P2734R0	14	17
std::function_ref: type-erased callable reference	P0792R14
std::copyable_function	P2548R6
std::bind_front, std::bind_back, and std::not_fn to NTTP callables	P2714R1
std::submdspan()	P2630R4 P3355R1
Freestanding Language: Optional ::operator new	P2013R5			N/A
Saturation Arithmetic	P0543R3	14	18
<debugging>: Debugging Support	P2546R5 P2810R3
<linalg>: A free function linear algebra interface based on the BLAS	P1673R13 P3050R2 P3222R0
Making assert() macro user friendly	P2264R7
Runtime format strings	P2918R2	14	18
std::span over an initializer list	P2447R6		18
std::span::at()	P2821R5	14	18
Added tuple protocol to std::complex	P2819R2		19
A new specification for std::generate_canonical	P0952R2			19.42*
Removing deprecated typedef std::allocator::is_always_equal	P2868R3	15	18
Removing function overload of std::basic_string::reserve() that takes no argument	P2870R3		18
Removing deprecated Unicode conversion facets (<codecvt>)	P2871R3		18
Freestanding: removing std::strtok	P2937R0	14		19.40*
Freestanding Library: Partial Classes	P2407R5	14		19.42*
Freestanding Library: inout expected span	P2833R2	14		19.42*
DR23: std::basic_const_iterator should follow its underlying type’s convertibility	P2836R1 P2950R0	14		19.40*
DR20: std::make_format_args now accepts only lvalue references instead of forwarding references	P2905R2	14	18	19.40*
DR20: Fix formatting of code units as integers	P2909R4	13.3	18	19.40*
views::concat	P2542R8	15
Concatenation of strings and string views	P2591R5	15	19
Enabling list-initialization for algorithms	P2248R8 P3217R0	15
std::ranges::generate_random	P1068R11
Comparisons for std::reference_wrapper	P2944R3	14	19 (partial)*
Padded mdspan layouts	P2642R6
New CTAD for std::span and std::mdspan with integral constants	P3029R1		19
Atomic maximum and minimum	P0493R5
std::formatter<std::filesystem::path>	P2845R8
Printing Blank Lines with std::println()	P3142R0	14*	19*	19.41**
Undeprecate std::polymorphic_allocator::destroy	P2875R4		15	19.41*
Removing deprecated strstreams	P2867R2		19
Removing deprecated std::shared_ptr Atomic Access APIs	P2869R4
Removing std::wstring_convert	P2872R3		19
DR23: Permit an efficient implementation of std::print	P3107R5 P3235R3			19.43*
Execution library	P2300R10 P3396R0
std::inplace_vector: dynamically-resizable vector with fixed capacity	P0843R14
std::philox_engine: counter-based random number engine	P2075R6
std::optional range support	P3168R2
std::is_virtual_base_of: type trait for detecting virtual base classes	P2985R0	15	20
std::dims for std::mdspan	P2389R2		19
DR11: Formal specification of the type of std::ignore	P2968R2	15	19	19.42*
DR20: Removing the common reference requirement from the indirectly invocable concepts	P2997R1	15	19	19.42*
Deprecating std::is_trivial and std::is_trivial_v	P3247R2	15
DR20: Algorithm function objects	P3136R1	Yes	Yes	19.39*	Yes
views::cache_latest	P3138R5
Constraining std::expected equality operators	P3379R1	15
std::aligned_accessor	P2897R7
std::atomic_ref::address()	P2835R7
DR11/20: cv-qualified types in std::atomic and std::atomic_ref	P3323R1
constexpr std::atomic and std::atomic_ref	P3309R3
constexpr for specialized memory algorithms	P3508R0 P3369R0
Added new library headers from C23	P3370R1
std::simd: data-parallel types	P1928R15
A utility for creating execution environments	P3325R5
constexpr for exception types, e.g. std::bad_alloc, std::bad_cast etc.	P3068R6
C++26 feature	Paper(s)	GCC libstdc++	Clang libc++	MSVC STL	Apple Clang*

* - hover over a cell marked with the star * to see additional pop-up notes.
DRnn - the number nn after "DR" denotes target C++ revision the Defect Report is applied to, e.g., DR20 → C++20.