Compiler support for 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)

Diagnostics library

Memory management library

Metaprogramming library(C++11)

General utilities library

Containers library

Iterators library

Ranges library(C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library(C++17)

Concurrency support library(C++11)

Execution control library(C++26)

Technical specifications

Symbols index

External libraries

 

Compiler support

C++11

C++14

C++17

C++20

C++23

C++26

 

* - 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
= delete("reason");  (FTM)*	P2573R2	15	19
Variadicfriends  (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		21
constexprstructured bindings and references to constexpr variables	P2686R5					6.7
constexprexceptions  (FTM)*	P3068R6
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 relocatability  (FTM)*	P2786R13
Trivial unions  (FTM)*	P3074R7
Observable checkpoints	P1494R5
Contracts  (FTM)*	P2900R14
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
<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
Extending associative containers with the remaining heterogeneous overloads  (FTM)*	P2363R5
Enabling the use of std::weak_ptr as keys in unordered associative containers  (FTM)*	P1901R2
Native handles in file streams  (FTM)*	P1759R6	14	18		16.0.0*
Interfacing string streams with std::string_view  (FTM)*	P2495R3		19
Interfacing std::bitset with std::string_view  (FTM)*	P2697R1		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
std::copyable_function  (FTM)*	P2548R6
std::bind_front, std::bind_back, and std::not_fn to NTTP callables  (FTM)*  (FTM)*  (FTM)*	P2714R1
std::submdspan()  (FTM)*	P2630R4 P3355R1
Freestanding Language: Optional ::operator new	P2013R5			N/A
Freestanding std::char_traits, std::errc and facilities in: <charconv>, <cstdlib>, <cstring>, <cwchar>  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*	P2338R4			N/A
More freestanding facilities  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*	P2198R7			N/A
Saturation Arithmetic  (FTM)*	P0543R3	14	18		16.0.0*
<debugging>: Debugging support  (FTM)*	P2546R5 P2810R4
<linalg>: A free function linear algebra interface based on the BLAS  (FTM)*	P1673R13 P3050R2 P3222R0
Making assert() macro user friendly	P2264R7
Runtime format strings  (FTM)*	P2918R2	14	18		16.0.0*
std::span over an initializer list  (FTM)*	P2447R6	15	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			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	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
New CTAD for std::span and std::mdspan with integral constants	P3029R1		19
Atomic maximum and minimum  (FTM)*	P0493R5
std::formatter<std::filesystem::path>  (FTM)*	P2845R8
Printing Blank Lines with std::println()  (FTM)*	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  (FTM)*	P3107R5 P3235R3			19.43*
Execution control library  (FTM)*	P2300R10 P3396R0
std::inplace_vector: dynamically-resizable vector with fixed capacity  (FTM)*	P0843R14
std::philox_engine: counter-based random number engine  (FTM)*	P2075R6
std::optional range support  (FTM)*	P3168R2
std::is_virtual_base_of: type trait for detecting virtual base classes  (FTM)*	P2985R0	15	20
std::dims for std::mdspan  (FTM)*	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  (FTM)*	P2997R1	15	19	19.42*
Deprecating std::is_trivial and std::is_trivial_v	P3247R2	15	21
DR20: Algorithm function objects	P3136R1	Yes	14	19.39*	14.0.3*
std::ranges::cache_latest_view  (FTM)*	P3138R5	15
Constraining std::expectedequality operators  (FTM)*	P3379R0	15
std::aligned_accessor: an std::mdspan accessor expressing pointer over-alignment  (FTM)*	P2897R7		21
std::is_sufficiently_aligned: checks a pointer’s alignment precondition  (FTM)*	P2897R7		21
std::atomic_ref::address()  (FTM)*	P2835R7
DR11/20: cv-qualified types in std::atomic and std::atomic_ref	P3323R1			19.44*
constexprstd::atomic and std::atomic_ref  (FTM)*	P3309R3
constexpr for specialized memory algorithms  (FTM)*	P3508R0 P3369R0	15
<stdbit.h> and <stdckdint.h>	P3370R1	15
<simd>: data-parallel types  (FTM)*  (FTM)*	P1928R15 P3430R3 P3441R2 P3287R3 P2663R7 P2933R4
A utility for creating execution environments	P3325R5
constexpr for exception types, e.g. std::bad_alloc, std::bad_cast etc.  (FTM)*	P3068R6 P3378R2
Trivial relocatability traits and operations  (FTM)*	P2786R13
Defang and deprecate std::memory_order::consume	P3475R1
Put std::monostate in <utility>	P0472R3	15	21	19.50*
std::indirect  (FTM)*	P3019R14
std::polymorphic  (FTM)*	P3019R14
More constexpr for containers and container adaptors: std::deque, std::flat_map, std::flat_multimap, std::flat_set, std::flat_multiset, std::forward_list, std::list, std::map, std::multimap, std::queue, std::priority_queue, std::set, std::multiset, std::stack, std::unordered_map, std::unordered_multimap, std::unordered_set, and std::unordered_multiset   (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*	P3372R3
constexprstd::inplace_vector for non-trivial types  (FTM)*	P3074R7
std::ranges::to_input_view  (FTM)*	P3137R3	15
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
<contracts>: Contract-violation handling support  (FTM)*	P2900R14
Standard library hardening  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*	P3471R4	15 (partial)*		19.44*(partial)*
Freestanding library: <algorithm>, <numeric> and <random>   (FTM)*  (FTM)*  (FTM)*  (FTM)*  (FTM)*	P2976R1
DR20: Converting contiguous iterators to pointers	P3349R0	15
C++26 feature	Paper(s)	GCC libstdc++	Clang libc++	MSVC STL	Apple Clang*