C++26

The next generation of the C++ standard.

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

This section is incomplete

New language features

New library features

New modules

New headers

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

C compatibility headers:

• <stdbit.h>
• <stdchkint.h>

Defect reports

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++	IBM XL C++	IBM Open XL C++ for AIX	IBM Open XL C++ for z/OS	Sun/Oracle C++	Embarcadero C++ Builder	Cray	Nvidia HPC C++ (ex PGI)*	Nvidia nvcc
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		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
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	P2686R4
constexpr exceptions	P3068R5
Consistent grammar for sequences	P3340R0
Oxford variadic comma	P3176R0
Deprecating the notion of trivial types	P3247R2
Removing deprecated array comparisons	P2865R5
C++26 feature	Paper(s)	GCC	Clang	MSVC	Apple Clang	EDG eccp	Intel C++	IBM XL C++	IBM Open XL C++ for AIX	IBM Open XL C++ for z/OS	Sun/Oracle C++	Embarcadero C++ Builder	Cray	Nvidia HPC C++ (ex PGI)*	Nvidia nvcc

C++26 library features

C++26 feature	Paper(s)	GCC libstdc++	Clang libc++	MSVC STL	Apple Clang*	IBM Open XL C/C++ for AIX*	Sun/Oracle C++*	Embarcadero C++ Builder*
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		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*
std::execution : sender-receiver model of execution control	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
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
Put std::monostate in <utility>	P0472R3
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::indirect and std::polymorphic : vocabulary types that implement value-like semantics on a dynamically allocated object	P3019R11
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*	IBM Open XL C/C++ for AIX*	Sun/Oracle C++*	Embarcadero C++ Builder*

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