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    Compiler support for C++26

    From cppreference.com
     
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    * - 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.

    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 16.0.0*
    DR98: Making non-encodable string literals ill-formed P1854R4 14 14 16.0.0*
    Unevaluated strings P2361R6 14 17 (partial)*
    18     		16.0.0*
    Adding @, $, and ` to the basic character set P2558R2 15 Yes 16.0.0*
    constexpr cast from void*  (FTM)* P2738R1 14 17
    DR20: On the ignorability of standard attributes P2552R3 15 Yes
    DR11: Static storage for braced initializers P2752R3 14
    User-generated static_assert messages  (FTM)* P2741R3 14 17
    Placeholder variables with no name  (FTM)* P2169R4 14 18
    Pack indexing  (FTM)* P2662R3 15 19
    Removing deprecated arithmetic conversion on enumerations P2864R2 14 18
    DR11/20: Template parameter initialization P2308R1 9 18
    Disallow binding a returned reference to a temporary P2748R5 14 19
    Attributes for structured bindings  (FTM)* P0609R3 15 19
    Erroneous behavior for uninitialized reads, [[indeterminate]] attribute P2795R5
    P3684R1     		16
    = delete("reason");  (FTM)* P2573R2 15 19
    Variadic friends  (FTM)* 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  (FTM)*  (FTM)* P2747R2 15 20
    Structured binding declaration as a condition  (FTM)* P0963R3 15 6 (partial)*
    21
    Ordering of constraints involving fold expressions  (FTM)* P2963R3 19
    Deleting a pointer to an incomplete type should be ill-formed P3144R2 15 19 6.7
    Structured bindings can introduce a pack  (FTM)* P1061R10 16 21
    constexpr structured bindings and references to constexpr variables P2686R5 16* 6.7
    constexpr exceptions  (FTM)* P3068R6 16
    Oxford variadic comma P3176R1 15 20
    Removing deprecated array comparisons P2865R6 15 20
    #embed  (FTM)* P1967R14 15 19*
    Concept and variable-template template-parameters  (FTM)* P2841R7
    Trivial unions  (FTM)* P3074R7
    P3726R2
    Observable checkpoints P1494R5 16
    Contracts  (FTM)* P2900R14 16
    Reflection  (FTM)* P2996R13
    P3394R4
    P3293R3
    P3096R12
    P3795R2     		16*
    Expansion statements  (FTM)* P1306R5 16
    constexpr virtual inheritance  (FTM)* P3533R2 16
    Diagnosing Preprocessor Errors P2843R3 16
    Allowing attaching main to the global module P3618R0 16
    DR20: Allowing #line before module declarations P3868R1
    DR17: Class template argument deduction for type template template parameters P3865R3
    Const-ification of splice expressions in contract assertions P3598R0
     

    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  (FTM)* P2497R0 14 18 16.0.0*
    std::text_encoding: text encodings identification  (FTM)* P1885R12
    P2862R1     		14
    Arithmetic overloads of std::to_string and std::to_wstring use std::format  (FTM)* P2587R3 14
    Type checking format args  (FTM)* P2757R3 15
    Formatting pointers  (FTM)* P2510R3 14* 17* 19.40**
    Hashing support for std::chrono value classes  (FTM)* P2592R3 16
    <rcu>: Read-Copy Update  (FTM)* P2545R4
    <hazard_pointer>: Hazard Pointers  (FTM)* P2530R3
    ADL-proof std::projected P2538R1 14* 18* 19.38** 16.0.0*
    constexpr stable sorting  (FTM)* P2562R1 15 21
    Member std::basic_format_arg::visit()  (FTM)* P2637R3 15 19
    Member std::variant::visit()  (FTM)* P2637R3 15 18
    std::is_within_lifetime  (FTM)* P2641R4
    P3450R1
    Extending associative containers with the remaining heterogeneous overloads  (FTM)* P2363R5 16
    Enabling the use of std::weak_ptr as keys in unordered associative containers  (FTM)* P1901R2 16
    Native handles in file streams  (FTM)* P1759R6 14 18 16.0.0*
    Interfacing string streams with std::string_view  (FTM)* P2495R3 16 19
    Interfacing std::bitset with std::string_view  (FTM)* P2697R1 16 18 16.0.0*
    More constexpr for <cmath> and <complex>  (FTM)*  (FTM)* P1383R2 4.6 (partial)*
    Adding the new 2022 SI prefixes on ratios: std::quecto, std::ronto, std::ronna, and std::quetta  (FTM)* P2734R0 14 17*
    std::function_ref: type-erased callable reference  (FTM)* P0792R14
    P3961R1     		16
    std::copyable_function  (FTM)* P2548R6 16
    std::bind_front, std::bind_back, and std::not_fn to NTTP callables  (FTM)*  (FTM)*  (FTM)* P2714R1 16
    std::submdspan()  (FTM)* P2630R4
    P3355R1
    P3663R3
    P3982R2     		16
    Freestanding Language: Optional ::operator new P2013R5 19.38*
    Freestanding std::char_traits, std::errc and facilities in: <charconv>, <cstdlib>, <cstring>, <cwchar>  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)* P2338R4 19.38*
    More freestanding facilities  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)* P2198R7 19.38*
    Saturation Arithmetic  (FTM)* P0543R3
    P4052R0     		14
    16*     		18 16.0.0*
    <debugging>: Debugging support  (FTM)* P2546R5
    P2810R4     		16*
    <linalg>: A free function linear algebra interface based on the BLAS  (FTM)* P1673R13
    P3050R2
    P3222R0
    P3371R5
    Making assert() macro user friendly P2264R7 yes*
    Dynamic format strings  (FTM)* P2918R2
    P3953R3     		14*
    16*     		18 16.0.0*
    std::span::at()  (FTM)* P2821R5 14 18 16.0.0*
    Added tuple protocol to std::complex  (FTM)* P2819R2 15 19
    A new specification for std::generate_canonical P0952R2 16 19.42*
    Removing deprecated typedef std::allocator::is_always_equal P2868R3 15 18 16.0.0*
    Removing function overload of std::basic_string::reserve() that takes no argument P2870R3 18 16.0.0*
    Removing deprecated Unicode conversion facets (<codecvt>) P2871R3 18 16.0.0*
    Freestanding: removing std::strtok  (FTM)* P2937R0 14 19.40*
    Freestanding Library: Partial Classes  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)* P2407R5 14 19.42*
    Freestanding Library: std::inout, std::expected, std::span  (FTM)*  (FTM)*  (FTM)*  (FTM)* P2833R2 14 19.42*
    DR23: std::basic_const_iterator should follow its underlying type’s convertibility  (FTM)* P2836R1
    P2950R0     		14 19.40*
    DR20: std::make_format_args now accepts only lvalue references instead of forwarding references P2905R2 14 18 19.40* 16.0.0*
    DR20: Fix formatting of code units as integers  (FTM)* P2909R4 13.3 18 19.40* 16.0.0*
    views::concat  (FTM)* P2542R8 15
    Concatenation of strings and string views  (FTM)* P2591R5 15 19
    Enabling list-initialization for algorithms  (FTM)* P2248R8
    P3217R0
    P3787R2     		15
    std::ranges::generate_random  (FTM)* P1068R11
    Comparisons for std::reference_wrapper, and constraints for comparisons of std::pair, std::tuple, std::optional, and std::variant  (FTM)*  (FTM)* P2944R3 14 19 (partial)*
    Padded mdspan layouts  (FTM)* P2642R6 16
    New CTAD for std::span and std::mdspan with integral constants P3029R1 16 19
    Atomic maximum and minimum  (FTM)* P0493R5 16
    std::formatter<std::filesystem::path>  (FTM)* P2845R8 16
    Printing Blank Lines with std::println()  (FTM)* P3142R0 14* 19* 19.41**
    Undeprecate std::polymorphic_allocator::destroy P2875R4 14.3* 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  (FTM)* P3107R5
    P3235R3     		16 19.43*
    Execution control library  (FTM)* P2300R10
    P3396R0
    P3570R2
    P3481R5
    P3433R1
    P3682R0
    P3388R3
    P3887R1
    Additional execution control library fixes P3826R5
    P4159R0
    P4154R0
    P3373R4
    P3986R1
    std::inplace_vector: dynamically-resizable vector with fixed capacity  (FTM)* P0843R14
    P3981R2
    P4022R0     		16 (partial)*
    std::philox_engine: counter-based random number engine  (FTM)* P2075R6 16
    std::optional range support  (FTM)* P3168R2
    P3913R1     		16
    std::is_virtual_base_of: type trait for detecting virtual base classes  (FTM)* P2985R0 15 20
    std::dims for std::mdspan  (FTM)* P2389R2 16 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  (FTM)* P2997R1 15 19 19.42*
    Deprecating std::is_trivial and std::is_trivial_v P3247R2 15 21
    DR20: Algorithm function objects P3136R1 Yes Yes 19.39* Yes
    std::ranges::cache_latest_view  (FTM)* P3138R5 15
    Constraining std::expected equality operators  (FTM)* P3379R0 15
    std::aligned_accessor: an std::mdspan accessor expressing pointer over-alignment  (FTM)* P2897R7 16
    std::is_sufficiently_aligned: checks a pointer’s alignment precondition  (FTM)* P2897R7 16
    std::atomic_ref::address()  (FTM)* P2835R7 16
    DR11/20: cv-qualified types in std::atomic and std::atomic_ref P3323R1 16 19.44*
    constexpr std::atomic and std::atomic_ref  (FTM)* P3309R3
    constexpr for specialized memory algorithms  (FTM)* P3508R0
    P3369R0     		15
    <stdbit.h> and <stdckdint.h>  (FTM)*  (FTM)* P3370R1 15*
    16
    <simd>: data-parallel types  (FTM)* P1928R15
    P3430R3
    P3441R2
    P3287R3
    P2876R3
    P3480R6
    P3691R1
    P3922R1     		16 (partial)*
    A utility for creating execution environments P3325R5
    constexpr for exception types, e.g. std::bad_alloc, std::bad_cast etc.  (FTM)* P3068R6
    P3378R2
    P3842R2     		16
    Bit operations support in std::simd  (FTM)* P2933R4
    Interleaved std::complex values support in std::simd  (FTM)* P2663R7
    Defang and deprecate std::memory_order::consume P3475R1
    Put std::monostate in <utility> P0472R3 15 21 19.50*
    std::indirect  (FTM)* P3019R14 16
    std::polymorphic  (FTM)* P3019R14 16
    More constexpr containers and adaptors  (FTM)* P3372R2 16 (partial)*
    constexpr std::inplace_vector for non-trivial types  (FTM)* P3074R7
    std::ranges::as_input_view  (FTM)* P3137R3
    P3828R1     		15*
    16*
    std::ranges::approximately_sized_range and std::ranges::reserve_hint  (FTM)* P2846R6
    <hive>: A bucket-based container that re-uses memory locations from erased elements  (FTM)* P0447R28
    Library support for observable checkpoints  (FTM)* P1494R5
    P3641R0     		16
    <contracts>: Contract-violation handling support  (FTM)* P2900R14
    P3819R0     		16
    Standard library hardening P3471R4
    P3697R1
    P3878R1     		15 (partial)* 19.44* (partial)* 19.50* (partial)*
    Freestanding library: <algorithm>, <numeric> and <random>  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)* P2976R1
    DR20: Converting contiguous iterators to pointers P3349R0 15 19.51*
    <meta>: Library support for reflection  (FTM)* P2996R13
    P3394R4
    P3293R3
    P3096R12
    P3795R2
    P4156R0     		16 (partial)*
    constexpr exceptions as error handling in reflection  (FTM)* P3560R2 16
    std::define_static_object, std::define_static_array, std::define_static_string  (FTM)* P3491R3 16
    std::optional<T&>  (FTM)*  (FTM)* P2988R12
    P3836R2     		16
    std::string::subview()  (FTM)* P3044R2 16
    constexpr std::shared_ptr and friends  (FTM)* P3037R6
    Coroutine task types  (FTM)* P3552R3
    P3980R1
    P3927R2
    P3941R4
    P4151R1
    Async scopes: creating scopes for non-sequential concurrency  (FTM)* P3149R11
    P3815R1
    Parallel scheduler  (FTM)* P2079R10
    P3804R2
    High-quality sender diagnostics with constexpr exceptions P3557R3
    execution::write_env and execution::unstoppable Sender Adaptors P3284R4
    std::views::indices  (FTM)* P3060R3 16
    Parallel range algorithms  (FTM)* P3179R9
    P3709R2
    Atomic floating-point min/max  (FTM)* P3008R6
    Atomic reduction operations  (FTM)* P3111R8
    Permutation API for std::simd  (FTM)* P2664R11
    std::mdspan::at() P3383R3 16
    std::exception_ptr_cast()  (FTM)* P2927R3
    P3748R0
    P3981R2     		16
    Standardized constexpr type ordering  (FTM)* P2830R10
    P3778R0
    P4140R0     		16
    std::constant_wrapper  (FTM)* P2781R9
    P3978R3     		16
    Removed return type deduction in std::apply and added related type traits P1317R2
    Making type-erased allocator use in std::promise and std::packaged_task consistent P3503R3 19.51*
    std::filesystem::path::display_string() and std::filesystem::path::native_encoded_string()  (FTM)* P2319R5
    Making std::istream::ignore() less surprising P3223R2 16 19.50*
    Resolved inconsistencies in begin/end for std::valarray and std::initializer_list  (FTM)*  (FTM)* P3016R6 19.51*
    std::flat_meow fixes  (FTM)*  (FTM)* P3567R2 19.51*
    Making std::integer_sequence usable in structured bindings and expansion statements  (FTM)* P1789R3 16
    constexpr text formatting  (FTM)* P3391R2
    std::start_lifetime  (FTM)* P3726R2
    std::is_structural: type trait for detecting structural types  (FTM)* P3856R8 16
    std::constant_wrapper used as a std::function_ref constructor argument P3948R1
    Supporting signed char and unsigned char in random number generation P4037R1
    Implementation-defined replaceability detection of the contract-

    violation handler using feature macro  (FTM)*

    		P3886R0 16
    DR20: Making user-defined constructors of view iterators/sentinels private P3059R2 Yes
    DR20: Filter view extensions for safer use  (FTM)* P3725R3 16
     

    C++26 feature     		 

    Paper(s)
    GCC libstdc++
    Clang libc++
    MSVC STL
    Apple Clang*