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Compiler support for C++23

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DRnn - the number nn after "DR" denotes target C++ revision the Defect Report is applied to, e.g., DR20 → C++20.

C++23 core language features

C++23 feature

 Paper(s)
GCC
Clang
MSVC
Apple Clang
EDG eccp
Intel C++
Nvidia HPC C++ (ex PGI)*
Nvidia nvcc
Cray
Literal suffix for (signed) size_t (FTM)* P0330R8 11 13 19.43* 13.1.6* 6.5 2022.2 23.9
Make () more optional for lambdas P1102R2 11 13 19.44* 13.1.6* 6.3 2022.2 22.5
if consteval (FTM)* P1938R3 12 14 19.44* 14.0.0* 6.3 2022.2 24.1
Removing Garbage Collection Support P2186R2 12 N/A 19.30* N/A N/A
Narrowing contextual conversions in static_assert and constexpr if P1401R5 9 13 (partial)*
14 		19.44* 14.0.0* N/A 2022.2 20.7
Trimming whitespaces before line splicing P2223R2 Yes Yes 19.50* Yes 6.7 2022.2 Yes
Make declaration order layout mandated P1847R4 Yes Yes 19.30* Yes 6.8 2022.2 Yes
Removing mixed wide string literal concatenation P2201R1 Yes Yes 19.44* Yes Yes Yes Yes
Explicit object member functions (deducing this) (FTM)* P0847R7 14 18
19* 		19.32*
(partial)*
19.43* 		6.3 22.5
auto(x) and auto{x} (FTM)* P0849R8 12 15 19.50* 14.0.3* 6.4 2022.2 23.3
#elifdef and #elifndef P2334R1 12 13 19.40* 13.1.6* 6.5 2022.2 23.9
Non-literal variables (and labels and gotos) in constexpr functions (FTM)* P2242R3 12 15 19.43* 14.0.3* 6.3 2022.2 22.5
Consistent character literal encoding P2316R2 Yes Yes 19.30* Yes Yes 2022.2 Yes
Character sets and encodings P2314R4 10 Yes 19.51* Yes Yes 2022.2 Yes
Extend init-statement (of for loop) to allow alias-declaration P2360R0 12 14 19.50* 14.0.0* 6.8 2022.2
Multidimensional subscript operator (FTM)* P2128R6 12 15 19.42* 14.0.3* 6.8 2022.2
Attributes on lambdas P2173R1 9 13 19.44* 13.1.6* 6.6 2022.2 22.5
#warning P2437R1 Yes* Yes 19.50* 15.0.0* 6.5 2023.2 Yes
Remove non-encodable wide character literals and multicharacter wide character literals P2362R3 13 14 19.51* 15.0.0* 6.7 2023.2
Labels at the end of compound statements P2324R2 13 16 19.51* 16.0.0* 6.5 2023.2 23.9
Delimited escape sequences P2290R3 13 15 19.50* 15.0.0* 6.7 2023.2
Named universal character escapes (FTM)* P2071R2 13 15 19.51* 15.0.0* 6.7 2023.2
Relaxing some constexpr restrictions (FTM)* P2448R2 13 17 (partial)
19 		19.51* 6.9 2024.0 (partial)
Simpler implicit move (FTM)* P2266R3 13 13 19.50* 6.7 2022.2
staticoperator() (FTM)* P1169R4 13 16 19.44* 16.0.0* 6.7 2023.2
Requirements for optional extended floating-point types P1467R9 13 N/A 6.4
Class template argument deduction from inherited constructors P2582R1 14 19.51* 6.9
Attribute [[assume]] P1774R8 13 19 19.51* 6.8
Support for UTF-8 as a portable source file encoding P2295R6 13* 15* 19.0 (Update 2)** 15.0.0* N/A 2023.2
staticoperator[] (FTM)* P2589R1 13 16 19.44* 16.0.0* 6.7 2023.2
Permitting staticconstexpr variables in constexpr functions (FTM)* P2647R1 13 16 19.51* 16.0.0* 6.8 2023.2
Extending the lifetime of temporaries in range-based for loop initializer (FTM)* P2644R1
P2718R0
CWG2659 		15 19 19.51* 6.8
DR11: Change scope of lambda trailing-return-type P2036R3
P2579R0 		16 17 19.50* 6.8 2023.2
DR20: Meaningful exports P2615R1 15 17 (partial) 19.28 (16.8)*
DR20: consteval needs to propagate up (FTM)* P2564R3 14 17 19.52* 16.0.0* 6.7 2024.0
DR98: C++ Identifier Syntax using Unicode Standard Annex 31 P1949R7 12 14 19.50* 14.0.0* 6.4 2022.2
DR11: Allow duplicate attributes P2156R1 11 13 19.50* 13.1.6* 6.5 23.9
DR20: Adjusting the value of feature-test macro __cpp_concepts P2493R0 12 19.50* 6.4 23.3
DR98: Relax requirements on wchar_t to match existing practices P2460R2 Yes Yes 19.44* 15.0.0* N/A 2023.2
DR11: Using unknown pointers and references in constant expressions P2280R4 14 20* 19.50*
DR20: The Equality Operator You Are Looking For P2468R2 13 16 19.36* 16.0.0* 2023.2
DR20: char8_t Compatibility and Portability Fix (FTM)* P2513R4 13 16 19.34* 16.0.0* 6.8 2023.2
DR98/11: Clarify reporting of diagnostic directives and allow static_assert of non-value-dependent expressions in a template context CWG2518 13 17 16.0*
(partial)*
19.40* 		6.7


C++23 feature

Paper(s)
GCC
Clang
MSVC
Apple Clang
EDG eccp
Intel C++
Nvidia HPC C++ (ex PGI)*
Nvidia nvcc
Cray

C++23 library features

C++23 feature

 Paper(s)
GCC libstdc++
Clang libc++
MSVC STL
Apple Clang*
Stacktrace library (FTM)* P0881R7
P2301R1 		12 (partial)*
14* 		19.34*
<stdatomic.h> (FTM)* P0943R6 12 15 19.31* 14.0.3*
std::is_scoped_enum (FTM)* P1048R1 11 12 19.30* 13.0.0*
std::basic_string::contains(), std::basic_string_view::contains() (FTM)* P1679R3 11 12 19.30* 13.0.0*
std::to_underlying (FTM)* P1682R3 11 13 19.30* 13.1.6*
Relaxing requirements for time_point<>::clock P2212R2 N/A N/A N/A N/A
Providing size feedback in the Allocator interface (FTM)* P0401R6 16 15 19.30* 14.0.3*
<spanstream>: string-stream with std::span-based buffer (FTM)* P0448R4 12 19.31*
std::out_ptr(), std::inout_ptr() (FTM)* P1132R8 14 19 19.30*
constexpr type_info::operator==() (FTM)* P1328R1 12 17 19.33**
19.34* 		15.0.0*
Iterator pair constructors for std::stack and std::queue (FTM)* P1425R4 12 14 19.31* 14.0.3*
Non-deduction context for allocators in container deduction guides P1518R2 12* 13* 19.31** 13.1.6**
ranges::starts_with() and ranges::ends_with() (FTM)* P1659R3 16 17 (partial)*
18 		19.31* 16.0.0*
Prohibiting std::basic_string and std::basic_string_view construction from nullptr P2166R1 12 13 19.30* 13.1.6*
std::invoke_r() (FTM)* P2136R3 12 17 19.31* 15.0.0*
Range constructor for std::basic_string_view P1989R2 11 14 19.30* 14.0.3*
Default template arguments for std::pair's forwarding constructor P1951R1 14 14 19.30* 14.0.3*
Remove Garbage Collection and Reachability-Based Leak Detection (library support) P2186R2 12 14 19.30* 14.0.3*
zip: views::zip, views::zip_transform, views::adjacent, and views::adjacent_transform (FTM)* P2321R2 13 15 (partial)*
22 		19.33*(partial)***
19.37* 		14.0.3*
Heterogeneous erasure overloads for associative containers (FTM)* P2077R3 16 19.32*
std::byteswap() (FTM)* P1272R4 12 14 19.31* 14.0.3*
Printing volatile T* P1147R1 11.3 14 19.31* 14.0.3*
basic_string::resize_and_overwrite() (FTM)* P1072R10 12 14 19.31* 14.0.3*
Monadic operations for std::optional (FTM)* P0798R8 12 14 19.32* 14.0.3*
std::move_only_function (FTM)* P0288R9 12 19.32*
Add a conditional noexcept specification to std::exchange P2401R0 12 14 19.31* 14.0.3*
Require std::span & std::basic_string_view to be TriviallyCopyable P2251R1 Yes Yes 19.31* Yes
Clarifying the status of the “C headers” P2340R1 Yes Yes Yes Yes
<expected> (FTM)* P0323R12
P2549R1 		12 16 19.33* 15.0.0*
constexpr for <cmath> and <cstdlib> (FTM)* P0533R9 4.6 (partial)*
std::unreachable() (FTM)* P0627R6 12 15 19.32* 14.0.3*
Deprecating std::aligned_storage and std::aligned_union P1413R3 13 16 19.33*
std::reference_constructs_from_temporary & std::reference_converts_from_temporary (FTM)* P2255R2 13 (partial)*
14 		21 (partial)* 19.51*
constexpr std::unique_ptr (FTM)* P2273R3 12 16 19.33* 15.0.0*
Constructing containers and strings from ranges with ranges::to(), tagged constructors, insert and assign member functions (FTM)* (FTM)* P1206R7 14 (partial)*
15 		17 19.34* 15.0.0*
Pipe support for user-defined range adaptors (ranges::range_adaptor_closure, std::bind_back) (FTM)* (FTM)* P2387R3 13 (partial)*
14 		19 19.34*
ranges::iota(), ranges::shift_left(), and ranges::shift_right() (FTM)* (FTM)* P2440R1 13 (partial)*
16 		23 19.34*
views::join_with (FTM)* P2441R2 13 21 19.34*
views::chunk and views::slide (FTM)* (FTM)* P2442R1 13 19.33*
views::chunk_by (FTM)* P2443R1 13 18 19.33* 16.0.0*
std::mdspan: a non-owning multidimensional array reference (FTM)* P0009R18
P2599R2
P2604R0
P2613R1
P2763R1 		16 17 (partial)*
18 		19.39* 15.0.0*
<flat_map> (FTM)* P0429R9 15 20 19.51*
<flat_set> (FTM)* P1222R4 15 21 19.51*
ranges::find_last(), ranges::find_last_if(), and ranges::find_last_if_not() (FTM)* P1223R5 13 19 19.36*
Freestanding Library: Easy <utility>, <ranges>, and <iterator> P1642R11 13* 19.38*
views::stride (FTM)* P1899R3 13 23 19.34*
Compatibility between std::tuple and tuple-like objects (FTM)* P2165R4 14 2.9 (partial)* 19.36* (partial)*
19.37* 		partial*
Rectifying constant iterators, sentinels, and ranges. views::as_const (FTM)* P2278R4 13 19.35* (partial)*
19.36*
Formatting Ranges (FTM)* P2286R8 15 16 19.37*(partial)*
19.39*(partial)*
19.41*(partial)*
19.42* 		15.0.0*
Improve default container formatting (FTM)* P2585R1 15 16 (partial)*
17 		19.42* 15.0.0*
Formatted output library <print> (FTM)* P2093R14
P2539R4 		14 17 (partial)*
18 		19.37* 15.0.0**
16.0.0*
Formatting std::thread::id and std::stacktrace (FTM)* P2693R1 14 17 (partial)* 19.38* 15.0.0*
constexpr for integral overloads of std::to_chars() and std::from_chars() (FTM)* P2291R3 13 16 19.34* 15.0.0*
ranges::contains() and ranges::contains_subrange() (FTM)* P2302R4 13 19 19.34* 16.0.0**
Ranges fold algorithms (FTM)* P2322R6 13 23
18 (partial)* 		19.35*
views::cartesian_product (FTM)* P2374R4
P2540R1 		13 19.37*
Adding move-only types support for comparison concepts (equality_comparable, totally_ordered, three_way_comparable) (FTM)* P2404R3 16 22 19.36*
Ranges iterators as inputs to non-ranges algorithms (FTM)* P2408R5 16 19.34*
constexpr std::bitset (FTM)* P2417R2 13 16 19.34* 15.0.0*
basic_string::substr() && P2438R2 16 16 19.34* 15.0.0*
views::as_rvalue (FTM)* P2446R2 13 16 19.34* 15.0.0*
Standard Library Modules (FTM)* P2465R3 15* 17 (partial)* 19.35*
(partial)*
19.36*
std::forward_like() (FTM)* P2445R1 14 16 19.34* 15.0.0*
Support exclusive mode for std::fstream (FTM)* P2467R1 12 18 19.36* 16.0.0*
views::repeat (FTM)* P2474R2 13 17 19.36* 15.0.0*
Relaxing range adaptors to allow for move-only types (FTM)* P2494R2 14 17 19.34* 15.0.0*
std::basic_string_view range constructor should be explicit P2499R0 12.2 16 19.34* 15.0.0*
std::generator: synchronous coroutine generator for ranges (FTM)* P2502R2
P2787R0 		14 19.43*
Add a conditional noexcept specification to std::apply P2517R1 10 18 19.34* 16.0.0*
Explicit lifetime management (std::start_lifetime_as) (FTM)* P2590R2
P2679R2 		16 19.51*
Clarify handling of encodings in localized formatting of chrono types (FTM)* P2419R2 15* 19.34**
std::move_iterator should not always be input_iterator (FTM)* P2520R0 12.3* 17* 19.34** 15.0.0*
Deduction guides update for explicit object parameter call operators LWG3617 14 19.34*
Deduction guides update for static operator() P1169R4 13 16 19.39* 15.0.0*
Standard names and library support for extended floating-point types P1467R9 13 19.37**
Monadic operations for std::expected (FTM)* P2505R5 13 17 19.36* 15.0.0*
views::enumerate (FTM)* P2164R9 13 23 19.37*
std::is_implicit_lifetime (FTM)* P2674R1 16 20 19.51*
std::common_reference_t of std::reference_wrapper should be a reference type (FTM)* (FTM)* P2655R3 16 21* 19.37*
Disallowing user specialization of std::allocator_traits P2652R2 19 19.37*
Deprecating std::numeric_limits::has_denorm P2614R2 17 18 19.37* 16.0.0*
Making Multi-Param Constructors Of views explicit P2711R1 16 21
17 (partial)* 		19.36** 15.0.0*
DR20: Relaxing Ranges Just A Smidge (FTM)* P2609R3 15 20 19.37*
DR20: Stashing Stashing Iterators For Proper Flattening P2770R0 14 21
18 (partial) 		19.37*
DR17: std::visit() for classes derived from std::variant (FTM)* P2162R2 11.3 13 19.20**
19.30* 		13.1.6*
DR20: Conditionally borrowed ranges P2017R1 11 16 19.30*
DR20: Repairing input range adaptors and std::counted_iterator P2259R1 12 19.30*(partial)*
19.31*
DR20: views::join should join all views of ranges P2328R1 11.2 15 19.30* 14.0.3*
DR20: view does not require default_initializable (FTM)* P2325R3 11.3 16 19.30* 15.0.0*
DR20: Range adaptor objects bind arguments by value P2281R1 11 14 19.29 (16.10)*
(partial)*
19.31* 		14.0.3*
DR20: constexpr for std::optional and std::variant (FTM)* (FTM)* P2231R1 11.3 (partial)*
12 		13 (partial)*
19 		19.31* 13.1.6* (partial)
DR20: views::lazy_split and redesigned views::split P2210R2 12 16 19.31* 15.0.0*
DR20: Fix ranges::istream_view P2432R1 12 16 19.31* 15.0.0*
DR20: view with ownership (FTM)* P2415R2 12 14 19.31* 14.0.3*
DR20: Fixing locale handling in chrono formatters (FTM)* P2372R3
P2418R2 		13 19.31*
DR20: Cleaning up integer-class types P2393R1 19.32*
DR20: Compile-time format string checks; Reducing binary code size of std::format() family (FTM)* P2216R3 13 14 (partial)*
15 		19.32* 14.0.3*
DR20: Add support for non-const-formattable types to std::format P2418R2 13 15 19.32* 14.0.3*
DR20: std::basic_format_string P2508R1 13 15 19.35* 14.0.3*
DR20: Poison Pills are Too Toxic (FTM)* P2602R2 14 19 19.36*
DR20: std::format fill character allowances P2572R1 14 17 19.37*
DR20: Improving std::format's width estimation P2675R1 14 17 19.38*
DR20: std::barrier's phase completion guarantees (FTM)* P2588R3 19.28 (16.8)**
19.36*


C++23 feature

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

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https://en.cppreference.com/cpp/compiler_support/23

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