Compiler support for C++23

 

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++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*		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		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*		2022.2
Multidimensional subscript operator  (FTM)*	P2128R6	12	15	19.42*	14.0.3*		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*			2024.0 (partial)
Simpler implicit move  (FTM)*	P2266R3	13	13	19.50*		6.7	2022.2
static operator()  (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*
Attribute [[assume]]	P1774R8	13	19	19.51*
Support for UTF-8 as a portable source file encoding	P2295R6	13*	15*	19.0 (Update 2)**	15.0.0*		2023.2
static operator[]  (FTM)*	P2589R1	13	16	19.44*	16.0.0*	6.7	2023.2
Permitting static constexpr variables in constexpr functions  (FTM)*	P2647R1	13	16	19.51*	16.0.0*		2023.2
Extending the lifetime of temporaries in range-based for loop initializer  (FTM)*	P2644R1 P2718R0 CWG2659	15	19	19.51*
DR11: Change scope of lambda trailing-return-type	P2036R3 P2579R0	16	17	19.50*			2023.2
DR20: Meaningful exports	P2615R1	15	17 (partial)	19.28 (16.8)*
DR20: consteval needs to propagate up  (FTM)*	P2564R3	14	17		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*		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*
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 std::chrono::time_point	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		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		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		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		19.37*
Disallowing user specialization of std::allocator_traits	P2652R2		19	19.37*
Deprecating std::numeric_limits::has_denorm	P2614R2		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*