# C++ compiler support

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The following tables present compiler support for new C++ features. These include accepted revisions to the standard, as well as various technical specifications:

- C++26/2c core language features
- C++26/2c library features

- C++23 core language features
- C++23 library features

- C++20 core language features
- C++20 library features
- Older standards
- Vendor compatibility checklists

#### Notes

* - 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 features

Note that this list may change, as the draft C++26/2c standard evolves.

### 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 |  | 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 |  |  |  |  |  |  |
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)* |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
constexpr structured bindings and references to constexpr variables | P2686R5 |  |  |  |  | 6.7 |  |  |  |
constexpr exceptions (FTM)* | P3068R6 |  |  |  |  |  |  |  |  |
Oxford variadic comma | P3176R1 | 15 | 20 |  |  |  |  |  |  |
Removing deprecated array comparisons | P2865R6 | 15 |  |  |  |  |  |  |  |
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 |  |  |  |
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 |  | 18 |  | 16.0.0*
std::span::at() (FTM)* | P2821R5 | 14 | 18 |  | 16.0.0*
Added tuple protocol to std::complex (FTM)* | P2819R2 |  | 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 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 |  |  |
DR20: Algorithm function objects | P3136R1 | Yes | Yes | 19.39* | Yes
`std::ranges::cache_latest_view` (FTM)* | P3138R5 |  |  |  |
Constraining std::expected equality operators (FTM)* | P3379R0 | 15 |  |  |
std::aligned_accessor: an std::mdspan accessor expressing pointer over-alignment (FTM)* | P2897R7 |  |  |  |
std::is_sufficiently_aligned: checks a pointer’s alignment precondition (FTM)* | P2897R7 |  |  |  |
std::atomic_ref::address() (FTM)* | P2835R7 |  |  |  |
DR11/20: cv-qualified types in std::atomic and std::atomic_ref | P3323R1 |  |  |  |
constexpr std::atomic and std::atomic_ref (FTM)* | P3309R3 |  |  |  |
constexpr for specialized memory algorithms (FTM)* | P3508R0 P3369R0 |  |  |  |
Added new library headers from C23 | P3370R1 |  |  |  |
`<simd>`: data-parallel types (FTM)* | P1928R15 |  |  |  |
A utility for creating execution environments | P3325R5 |  |  |  |
constexpr for exception types, e.g. std::bad_alloc, std::bad_cast etc. (FTM)* | P3068R6 |  |  |  |
C++26 feature | Paper(s) | GCC libstdc++ | Clang libc++ | MSVC STL | Apple Clang*

## C++23 features

### 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 |  | 13.1.6* | 6.3 | 2022.2 | 22.5 |  |
`if consteval` (FTM)* | P1938R3 | 12 | 14 |  | 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 |  | 14.0.0* |  | 2022.2 | 20.7 |  |
Trimming whitespaces before line splicing | P2223R2 | Yes | Yes |  | Yes | 6.7 | 2022.2 | Yes |  |
Make declaration order layout mandated | P1847R4 | Yes | Yes | Yes | Yes |  | 2022.2 | Yes |  |
Removing mixed wide string literal concatenation | P2201R1 | Yes | Yes | Yes | Yes | Yes | Yes | Yes |  |
Explicit object member functions (deducing this) (FTM)* | P0847R7 | 14 | 18 19* | 19.32* (partial)* |  | 6.3 |  | 22.5 |  |
`auto(x)` and `auto{x}` (FTM)* | P0849R8 | 12 | 15 |  | 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 |  | 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 |  | Yes | Yes | 2022.2 | Yes |  |
Extend init-statement (of `for` loop) to allow alias-declaration | P2360R0 | 12 | 14 |  | 14.0.0* |  | 2022.2 |  |  |
Multidimensional subscript operator (FTM)* | P2128R6 | 12 | 15 |  | 14.0.3* |  | 2022.2 |  |  |
Attributes on lambdas | P2173R1 | 9 | 13 |  | 13.1.6* | 6.6 | 2022.2 | 22.5 |  |
`#warning` | P2437R1 | Yes* | Yes |  | 15.0.0* | 6.5 | 2023.2 | Yes |  |
Remove non-encodable wide character literals and multicharacter wide character literals | P2362R3 | 13 | 14 |  | 15.0.0* | 6.7 | 2023.2 |  |  |
Labels at the end of compound statements | P2324R2 | 13 | 16 |  | 16.0.0* | 6.5 | 2023.2 | 23.9 |  |
Delimited escape sequences | P2290R3 | 13 | 15 |  | 15.0.0* | 6.7 | 2023.2 |  |  |
Named universal character escapes (FTM)* | P2071R2 | 13 | 15 |  | 15.0.0* | 6.7 | 2023.2 |  |  |
Relaxing some constexpr restrictions (FTM)* | P2448R2 | 13 | 17 (partial) 19 |  |  |  | 2024.0 (partial) |  |  |
Simpler implicit move (FTM)* | P2266R3 | 13 | 13 |  |  | 6.7 | 2022.2 |  |  |
static operator() (FTM)* | P1169R4 | 13 | 16 |  | 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 |  |  |  |  |  |  |  |
Attribute `[[assume]]` | P1774R8 | 13 | 19 |  |  |  |  |  |  |
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 |  | 16.0.0* | 6.7 | 2023.2 |  |  |
Permitting static constexpr variables in constexpr functions (FTM)* | P2647R1 | 13 | 16 |  | 16.0.0* |  | 2023.2 |  |  |
Extending the lifetime of temporaries in range-based for loop initializer (FTM)* | P2644R1 P2718R0 CWG2659 | 15 | 19 |  |  |  |  |  |  |
DR11: Change scope of lambda trailing-return-type | P2036R3 P2579R0 |  | 17 |  |  |  | 2023.2 |  |  |
DR20: Meaningful exports | P2615R1 | 15 | 17 (partial) |  |  |  |  |  |  |
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 |  | 14.0.0* | 6.4 | 2022.2 |  |  |
DR11: Allow duplicate attributes | P2156R1 | 11 | 13 |  | 13.1.6* | 6.5 |  | 23.9 |  |
DR20: Adjusting the value of feature-test macro `__cpp_concepts` | P2493R0 | 12 |  | 19.32* |  | 6.4 |  | 23.3 |  |
DR98: Relax requirements on wchar_t to match existing practices | P2460R2 | Yes | Yes |  | 15.0.0* | N/A | 2023.2 |  |  |
DR11: Using unknown pointers and references in constant expressions | P2280R4 | 14 | 20* |  |  |  |  |  |  |
DR20: The Equality Operator You Are Looking For | P2468R2 | 13 | 16 |  | 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 time_point<>::clock | P2212R2 | N/A | N/A | N/A | N/A
Providing size feedback in the Allocator interface (FTM)* | P0401R6 |  | 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 |  | 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)* | 19.33*(partial)*** 19.37* | 14.0.3*
Heterogeneous erasure overloads for associative containers (FTM)* | P2077R3 |  |  | 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 | 19.25* | 14.0.3*
Require `std::span` & std::basic_string_view to be TriviallyCopyable | P2251R1 | Yes | Yes | Yes | 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 | 19 |  |
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)* | 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)* |  | 19.34* |
`views::join_with` (FTM)* | P2441R2 | 13 |  | 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 |  | 17 (partial)* 18 | 19.39* | 15.0.0*
`<flat_map>` (FTM)* | P0429R9 | 15 | 20 |  |
`<flat_set>` (FTM)* | P1222R4 | 15 |  |  |
`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* |  | N/A |
`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 |  | 16 | 19.37*(partial)* 19.39*(partial)* 19.41*(partial)* 19.42* | 15.0.0*
Improve default container formatting (FTM)* | P2585R1 |  | 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 |  |  | 19.36* |
Ranges iterators as inputs to non-ranges algorithms (FTM)* | P2408R5 |  |  | 19.34* |
constexpr std::bitset (FTM)* | P2417R2 | 13 | 16 | 19.34* | 15.0.0*
`basic_string::substr()` `&&` | P2438R2 |  | 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 |  |  |  |
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 |  | 20 |  |
std::common_reference_t of std::reference_wrapper should be a reference type (FTM)* (FTM)* | P2655R3 |  |  | 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 `view`s `explicit` | P2711R1 |  | 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 | 18 | 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*

## C++20 features

### C++20 core language features

C++20 feature | Paper(s) | GCC | Clang | MSVC | Apple Clang | EDG eccp | Intel C++ | Nvidia HPC C++ (ex PGI)* | Nvidia nvcc | Cray |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Allow Lambda capture [=, this] | P0409R2 | 8 | 6 | 19.22* | 10.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
`__VA_OPT__` | P0306R4 P1042R1 | 8 (partial)* 10 (partial)* 12 | 9 | 19.25* | 11.0.3* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Designated initializers (FTM)* | P0329R4 | 4.7 (partial)* 8 | 3.0 (partial)* 10 | 19.21* | 12.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
template-parameter-list for generic lambdas (FTM)* | P0428R2 | 8 | 9 | 19.22* | 11.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Default member initializers for bit-fields | P0683R1 | 8 | 6 | 19.25* | 10.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Initializer list constructors in class template argument deduction | P0702R1 | 8 | 6 | 19.14* | Yes | 5.0 | 2021.1 | 20.7 | 12.0 | 11.0
const&-qualified pointers to members | P0704R1 | 8 | 6 | 19.0 (2015)* | 10.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Concepts (FTM)* | P0734R0 | 5* 10 | 10 | 19.23* (partial)* 19.30* | 12.0.0* (partial) | 6.1 | 2023.1* | 20.11 | 12.0 | 11.0
Lambdas in unevaluated contexts | P0315R4 | 9 | 13 (partial)* 14 (partial)* 17 | 19.28 (16.8)* | 13.1.6* (partial) | 6.2 | 2023.1 (partial) 2024.0 | 20.7 | 12.0 |
Three-way comparison operator (FTM)* | P0515R3 | 10 | 8 (partial) 10 | 19.20* | 12.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
DR11: Simplifying implicit lambda capture | P0588R1 | 8 |  | 19.24* |  | 5.1 | 2021.1 | 20.7 | 12.0 |
init-statements for range-based for | P0614R1 | 9 | 8 | 19.25* | 11.0.0* | 6.0 | 2021.7 | 20.11 | 12.0 | 11.0
Default constructible and assignable stateless lambdas | P0624R2 | 9 | 8 | 19.22* | 10.0.1* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Type mismatch of defaulted special member functions | P0641R2 | 9 (partial)* | 8 | 19.0 (2015)* (partial)* | 10.0.1* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Access checking on specializations | P0692R1 | Yes | 8 (partial) 14 | 19.26* | 14.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 |
ADL and function templates that are not visible | P0846R0 | 9 | 9 | 19.21* | 11.0.3* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
DR11: Specify when constexpr function definitions are needed for constant evaluation (FTM)* | P0859R0 | 5.2 (partial)* 9 | 8 | 19.27* (partial)* 19.31** | 11.0.0* | (partial) |  |  | 12.0 | 11.0
Attributes `[[likely]]` and `[[unlikely]]` | P0479R5 | 9 | 12 | 19.26* | 13.0.0* | 5.1 | 2021.7 | 20.7 | 12.0 |
Make `typename` more optional | P0634R3 | 9 | 16 | 19.29 (16.10)* | 16.0.0* | 5.1 | 2023.1 | 20.7 | 12.0 |
`Pack-expansions` in lambda init-captures (FTM)* | P0780R2 | 9 | 9 | 19.22* | 11.0.3* | 6.1 | 2021.7 | 20.11 | 12.0 | 11.0
Attribute `[[no_unique_address]]` | P0840R2 | 9 | 9 | 19.28 (16.9)** | 11.0.3* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Conditionally trivial special member functions (FTM)* | P0848R3 | 10 | 16 | 19.28 (16.8)* |  | 6.1 | 2021.7 | 20.11 | 12.0 |
DR17: Relaxing the structured bindings customization point finding rules | P0961R1 | 8 | 8 | 19.21* | 10.0.1* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
DR11: Relaxing the range-for loop customization point finding rules | P0962R1 | 8 | 8 | 19.25* | 11.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
DR17: Allow structured bindings to accessible members | P0969R0 | 8 | 8 | 19.21* | 10.0.1* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Destroying `operator delete` (FTM)* | P0722R3 | 9 | 6 | 19.27* | 10.0.0* | 6.1 | 2023.1 | 20.11 | 12.0 | 11.0
Class types in Non-type template parameters | P0732R2 | 9 | 12 (partial) | 19.26*(partial)* 19.28 (16.9)* | 13.0.0* (partial) | 6.2 | 2023.1 (partial) | 21.3 | 12.0 |
Deprecate implicit capture of this via `[=]` | P0806R2 | 9 | 7 | 19.22* | 10.0.1* | 5.1 |  | 20.7 | 12.0 | 11.0
`explicit(bool)` (FTM)* | P0892R2 | 9 | 9 | 19.24* | 11.0.3* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Integrating feature-test macros | P0941R2 | 5 | 3.4 | 19.15* (partial) 19.20* | Yes | 5.0 | 2021.1 | 20.7 | 12.0 | 11.0
Prohibit aggregates with user-declared constructors | P1008R1 | 9 | 8 | 19.20* | 10.0.1* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
constexpr virtual function (FTM)* | P1064R0 | 9 | 9 | 19.28 (16.9)* | 11.0.3* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Consistency improvements for comparisons | P1120R0 | 10 | 8 (partial) 10 | 19.22* | 12.0.0* | 5.1 | 2023.1 | 20.7 | 12.0 | 11.0
`char8_t` (FTM)* | P0482R6 | 9 | 7* | 19.22* | 10.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
`std::is_constant_evaluated()` (FTM)* | P0595R2 | 9 | 9 | 19.25* | 11.0.3* | 5.1 | 19.1 | 21.1 | 12.0 | 11.0
constexpr try-catch blocks | P1002R1 | 9 | 8 | 19.25* | 10.0.1* | 5.1 | 2023.1 | 20.7 | 12.0 | 11.0
Immediate functions (consteval) (FTM)* | P1073R3 | 10 (partial)* 11 | 11 (partial) 14 (partial)* 17 | 19.28 (16.8)* (partial)* 19.29 (16.10)* | 11.0.3* (partial) 15.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 |
Nested inline namespaces | P1094R2 | 9 | 8 | 19.27* | 10.0.1* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Yet another approach for constrained declarations | P1141R2 | 10 | 10 | 19.26* (partial) 19.28 (16.9)* | 12.0.5* | 6.1 | 2023.1 | 20.11 | 12.0 | 11.0
Signed integers are two's complement | P1236R1 | 9 | 9 | Yes | 11.0.3* | N/A | 2023.1* | yes* | 12.0 | 11.0
`dynamic_cast` and polymorphic `typeid` in constant expressions | P1327R1 | 10 | 9 | 19.29 (16.10)* | 11.0.3* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Changing the active member of a union inside constexpr (FTM)* | P1330R0 | 9 | 9 | 19.10* | 11.0.3* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Coroutines (FTM)* (FTM)* | P0912R5 LWG3393 | 10 | 8 (partial) 17 (partial)* | 19.0 (2015)* (partial) 19.10** 19.28 (16.8)* | 10.0.1* (partial) | 5.1 | 2021.1 | 23.3* | 12.0 (host code only) |
Parenthesized initialization of aggregates (FTM)* | P0960R3 | 10 | 16 | 19.28 (16.8)* | 16.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 |
DR11: Array size deduction in `new`-expressions | P1009R2 | 11 | 9 | 19.27* | 11.0.3* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Modules (FTM)* | P1103R3 | 11 (partial) | 8 (partial) | 19.0 (2015)* (partial) 19.10** 19.28 (16.8)* | 10.0.1* (partial) |  | 2023.1 (partial) |  |  |
Stronger Unicode requirements | P1041R4 P1139R2 | 10 | Yes | 19.0 (2015)** 19.26** | Yes | N/A | 2023.1* | Yes | 12.0 | 11.0
`<=> != ==` | P1185R2 | 10 | 10 | 19.22* | 12.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
DR11: Explicitly defaulted functions with different exception specifications | P1286R2 | 10 | 9 | 19.28 (16.8)* | 11.0.3* | 5.1 | 2021.1 | 20.7 | 12.0 | 11.0
Lambda capture and storage class specifiers of structured bindings | P1091R3 P1381R1 | 10 | 8 (partial) 16 | 19.11** 19.24** | 16.0.0* | 5.1 | 2021.1 | 20.7 | 12.0 |
Permit conversions to arrays of unknown bound | P0388R4 | 10 | 14 | 19.27* | 14.0.0* | 6.0 | 2021.5 | 20.11 | 12.0 |
constexpr container operations (FTM)* | P0784R7 | 10 | 10 | 19.28 (16.9)* | 12.0.0* | 6.0 | 2021.5 | 20.11 | 12.0 | 11.0
Deprecating some uses of `volatile` | P1152R4 | 10 | 10 | 19.27* | 12.0.0* | 6.0 | 2021.5 | 20.11 | 12.0 | 11.0
`constinit` (FTM)* | P1143R2 | 10 | 10 | 19.29 (16.10)* | 12.0.0* | 6.1 | 2021.7 | 20.11 | 12.0 | 11.0
Deprecate comma operator in subscripts | P1161R3 | 10 | 9 | 19.25* | 11.0.3* | 6.0 | 2021.7 | 20.11 | 12.0 | 11.0
`[[nodiscard]]` with message | P1301R4 | 10 | 9 | 19.25* | 11.0.3* | 6.0 | 2021.5 | 20.11 | 12.0 | 11.0
Trivial default initialization in constexpr functions | P1331R2 | 10 | 10 | 19.27* | 12.0.0* | 6.1 | 2021.7 | 20.11 | 12.0 | 11.0
Unevaluated asm-declaration in constexpr functions | P1668R1 | 10 | 10 | 19.28 (16.9)* | 12.0.0* | 6.1 | 2021.7 | 20.11 | 12.0 | 11.0
`using enum` (FTM)* | P1099R5 | 11 | 13 | 19.24* | 13.1.6* | 6.3 | 2023.1 | 22.5 | 12.0 |
Synthesizing Three-way comparison for specified comparison category | P1186R3 | 11 | 10 | 19.24* | 12.0.0* | 6.0 | 2021.5 | 20.11 | 12.0 | 11.0
DR17: `[[nodiscard]]` for constructors | P1771R1 | 10 | 9 | 19.24* | 11.0.3* | 6.0 | 2021.5 | 20.11 | 12.0 | 11.0
class template argument deduction for alias templates (FTM)* | P1814R0 | 10 | 19 | 19.27* |  | 6.5 |  | 23.9 | 12.0 |
class template argument deduction for aggregates (FTM)* | P1816R0 P2082R1 | 10* 11* | 17 | 19.27* |  | 6.3 | 2023.1 (partial)* 2024.1 | 23.3 | 12.0 |
DR11: Implicit move for more local objects and rvalue references | P1825R0 | 11* | 13 | 19.24* | 13.1.6* | 6.0 | 2021.5 | 20.11 | 12.0 |
Allow defaulting comparisons by value | P1946R0 | 10 | 10 | 19.25* | 12.0.0* | 6.1 | 2021.7 | 20.11 | 12.0 | 11.0
Remove `std::weak_equality` and `std::strong_equality` | P1959R0 | 10 | 10 | 19.25* | 12.0.0* | 6.1 | 2021.7 | 20.11 | 12.0 | 11.0
Inconsistencies with non-type template parameters (FTM)* | P1907R1 | 10 (partial) 11 | 18 (partial)* | 19.26* | 13.1.6* (partial) | 6.2 | 2023.1 (partial) | 21.3 | 12.0 |
DR98: Pseudo-destructors end object lifetimes | P0593R6 | 11 | 11 | Yes | 12.0.5* | N/A | 2023.1* | Yes | 12.0 | 11.0
DR11: Converting from T* to bool should be considered narrowing | P1957R2 | 10* 11* | 11 | 19.27* | 12.0.5* | 6.1 |  |  | 12.0 | 11.0
C++20 feature | Paper(s) | GCC | Clang | MSVC | Apple Clang | EDG eccp | Intel C++ | Nvidia HPC C++ (ex PGI)* | Nvidia nvcc | Cray

### C++20 library features

C++20 feature | Paper(s) | GCC libstdc++ | Clang libc++ | MSVC STL | Apple Clang* |
--- | --- | --- | --- | --- | --- | ---
`std::endian` (FTM)* | P0463R1 | 8 | 7 | 19.22* | 10.0.0*
Extending std::make_shared() to support arrays (FTM)* | P0674R1 | 12 | 15 | 19.27* | 14.0.3*
Floating-point atomic (FTM)* | P0020R6 | 10 | 18 | 19.22* | 16.0.0*
Synchronized buffered (`std::basic_osyncstream`) (FTM)* | P0053R7 | 11 | 18 | 19.29 (16.10)* |
constexpr for `<algorithm>` and `<utility>` (FTM)* | P0202R3 | 10 | 8 (partial) 12 | 19.26* | 10.0.1* (partial) 13.0.0*
More constexpr for `<complex>` (FTM)* | P0415R1 | 9 | 7 (partial) 16 | 19.27* | 10.0.0* (partial) 15.0.0*
Make std::memory_order a scoped enumeration | P0439R0 | 9 | 9 | 19.25* | 11.0.3*
String prefix and suffix checking: `string` `(_view)` `::starts_with` / `ends_with` (FTM)* | P0457R2 | 9 | 6 | 19.21* | 10.0.0*
Library support for `operator<=>` `<compare>` (FTM)* | P0768R1 | 10 | 7 (partial) 12 (partial)* 17 | 19.20* (partial) 19.28 (16.9)* | 13.0.0*
`std::remove_cvref` (FTM)* | P0550R2 | 9 | 6 | 19.20* | 10.0.0*
`[[nodiscard]]` in the standard library | P0600R1 | 9 | 7 (partial) 16 | 19.13* (partial) 19.22* | 10.0.0* (partial) 15.0.0*
Using `std::move` in numeric algorithms | P0616R0 | 9 | 12 | 19.23* | 13.0.0*
Utility to convert a pointer to a raw pointer (FTM)* | P0653R2 | 8 | 6 | 19.22* | Yes
Atomic `std::shared_ptr` and `std::weak_ptr` (FTM)* | P0718R2 | 12 |  | 19.27* |
`std::span` (FTM)* | P0122R7 | 10 | 7 | 19.26* | 10.0.0*
Calendar and Time zone (FTM)* | P0355R7 | 11 (partial)* 13 (partial)* 14 | 7 (partial) 19 (partial)* | 19.29 (16.10)* | 10.0.0* (partial)
`<version>` | P0754R2 | 9 | 7 | 19.22* | 10.0.0*
Comparing unordered containers | P0809R0 | Yes | Yes | 16.0* | Yes
ConstexprIterator requirements (FTM)* (FTM)* | P0858R0 | 9 | 12 | 19.11* | 13.0.0*
std::basic_string::reserve() should not shrink | P0966R1 | 11 | 8 | 19.25* | 10.0.1*
Atomic Compare-And-Exchange with padding bits | P0528R3 | 13 |  | 19.28 (16.8)* |
`std::atomic_ref` (FTM)* | P0019R8 | 10 | 19 | 19.28 (16.8)* |
contains() member function of associative containers, e.g. `std::map::contains()` | P0458R2 | 9 | 13 | 19.21* | 13.1.6*
DR11: Guaranteed copy elision for piecewise construction | P0475R1 | 9 | Yes | 19.29 (16.10)* | Yes
`std::bit_cast()` (FTM)* | P0476R2 | 11 | 14 | 19.27* | 14.0.3*
Integral power-of-2 operations: `std::bit_ceil()`, `std::bit_floor()`, `std::bit_width()`, `std::has_single_bit()` (FTM)* | P0556R3 P1956R1 | 9* 10* | 9* 12* | 19.25** 19.27** 19.28 (16.8)* | 11.0.3** 13.0.0**
Improving the return value of erase-like algorithms (FTM)* | P0646R1 | 9 | 10 | 19.21* | 12.0.0*
`std::destroying_delete_t` (FTM)* | P0722R3 | 9 | 9 | 19.27* | 11.0.3*
`std::is_convertible` (FTM)* | P0758R1 | 9 | 9 | 19.23* | 11.0.3*
Add `std::shift_left/right` to `<algorithm>` (FTM)* | P0769R2 | 10 | 12 | 19.21* | 13.0.0*
Constexpr for std::swap() and `swap` related functions | P0879R0 | 10 | 13 | 19.26* | 13.1.6*
`std::type_identity` (FTM)* | P0887R1 | 9 | 8 | 19.21* | 10.0.1*
Concepts library (FTM)* | P0898R3 | 10 | 13 | 19.23* | 13.1.6*
`constexpr` comparison operators for std::array | P1023R0 | 10 | 8 | 19.27* | 10.0.1*
`std::unwrap_ref_decay` and `std::unwrap_reference` (FTM)* | P0318R1 | 9 | 8 | 19.21* | 10.0.1*
`std::bind_front()` (FTM)* | P0356R5 | 9 | 13 | 19.25* | 13.1.6*
std::reference_wrapper for incomplete types | P0357R3 | 9 | 8 | 19.26* | 10.0.1*
Fixing `operator>>(basic_istream&, CharT*)` | P0487R1 | 11 | 8 | 19.23* | 10.0.1*
Library support for `char8_t` (FTM)* | P0482R6 | 9 | 8 (partial) 16 | 19.22* | 10.0.1* (partial) 15.0.0*
Utility functions to implement uses-allocator construction | P0591R4 | 9 | 16 | 19.29 (16.10)* | 15.0.0*
DR17: std::variant and std::optional should propagate copy/move triviality | P0602R4 | 8.3 | 8 | 19.11* | 10.0.1*
DR17: A sane std::variant converting constructor | P0608R3 | 10 | 9 | 19.29 (16.10)** 19.42** | 11.0.3*
std::function's move constructor should be `noexcept` | P0771R1 | 7.2 | 6 | 19.22* | Yes
The One Ranges Proposal (FTM)* | P0896R4 | 10 | 13 (partial) 15* | 19.29 (16.10)* | 14.0.3*
Heterogeneous lookup for unordered associative containers (FTM)* | P0919R3 P1690R1 | 11 | 12 | 19.23* (P0919R3) 19.25* (P1690R1) | 13.0.0*
`<chrono>` `zero()`, `min()`, and `max()` should be `noexcept` | P0972R0 | 9 | 8 | 19.14* | 10.0.1*
constexpr in std::pointer_traits (FTM)* | P1006R1 | 9 | 8 | 19.26* | 10.0.1*
`std::assume_aligned()` (FTM)* | P1007R3 | 9* 11 | 15 | 19.28 (16.9)* | 14.0.3*
Smart pointer creation with default initialization (e.g. `make_unique_for_overwrite`) (FTM)* | P1020R1 P1973R1 | 11* 12* | 16 | 19.28 (16.9)* | 15.0.0*
Misc constexpr bits (FTM)* (FTM)* (FTM)* (FTM)* (FTM)* (FTM)* | P1032R1 | 10 | 13 | 19.28 (16.8)* | 13.1.6*
Remove comparison operators of `std::span` | P1085R2 | 10 | 8 | 19.26* | 10.0.1*
Make stateful allocator propagation more consistent for `operator+(basic_string)` | P1165R1 | 10 | 15 | 19.26* | 14.0.3*
Consistent container erasure, e.g. `std::erase(std::vector)`, or `std::erase_if(std::map)` (FTM)* | P1209R0 P1115R3 | 9* 10* | 8* 11* | 19.25** 19.27** | 10.0.1** 12.0.5**
Standard library header units | P1502R1 | 11 |  | 19.29 (16.10)* |
`polymorphic_allocator<>` as a vocabulary type (FTM)* | P0339R6 | 9 | 16 | 19.28 (16.9)* | 15.0.0*
`std::execution::unseq` (FTM)* | P1001R2 | 9 | 17 | 19.28 (16.8)* |
`std::lerp()` and `std::midpoint()` (FTM)* | P0811R3 | 9 | 9 | 19.23* (partial) 19.28 (16.8)* | 11.0.3*
Usability enhancements for `std::span` | P1024R3 | 10 | 9* 14 | 19.26* | 11.0.3*
DR17: Make `std::create_directory()` intuitive | P1164R1 | 8.3 | 12 | 19.20* | 13.0.0*
`std::ssize()` and unsigned extent for `std::span` (FTM)* | P1227R2 | 10 | 9 | 19.25* | 11.0.3*
Traits for (un)bounded arrays (FTM)* | P1357R1 | 9 | 9 | 19.25* | 11.0.3*
`std::to_array()` (FTM)* | P0325R4 | 10 | 10 | 19.25* | 12.0.0*
Efficient access to std::basic_stringbuf’s buffer | P0408R7 | 11 | 17 | 19.29 (16.10)* | 15.0.0*
Layout-compatibility and pointer-interconvertibility traits (FTM)* (FTM)* | P0466R5 | 12 |  | 19.29 (16.10)** |
Bit operations: std:: `rotl()`, `rotr()`, `countl_zero()`, `countl_one()`, `countr_zero()`, `countr_one()`, `popcount()` (FTM)* | P0553R4 | 9 | 9 | 19.25** 19.28 (16.8)* | 11.0.3*
Mathematical constants (FTM)* | P0631R8 | 10 | 11 | 19.25* | 12.0.5*
Text formatting (FTM)* | P0645R10 | 13 | 14** 17 | 19.29 (16.10)* | 15.0.0*
`std::stop_token` and `std::jthread` (FTM)* | P0660R10 | 10 | 17 (partial)* 20* | 19.28 (16.9)* |
constexpr std::allocator and related utilities (FTM)* | P0784R7 | 10 | 12 | 19.29 (16.10)* | 13.0.0*
constexpr std::string (FTM)* | P0426R1 P1032R1 P0980R1 | 12 | 15 | 19.29 (16.10)* 19.30** | 14.0.3*
constexpr std::vector (FTM)* | P1004R2 | 12 | 15 | 19.29 (16.10)* 19.30** | 14.0.3*
Input range adaptors | P1035R7 | 10 | 16 | 19.29 (16.10)* | 15.0.0*
constexpr std::invoke() and related utilities | P1065R2 | 10 | 12 | 19.28 (16.8)* | 13.0.0*
Atomic waiting and notifying, `std::counting_semaphore`, `std::latch` and `std::barrier` (FTM)* (FTM)* (FTM)* (FTM)* (FTM)* (FTM)* | P1135R6 | 11 | 11 | 19.28 (16.8)* | 13.1.6*
`std::source_location` (FTM)* | P1208R6 | 11 | 15* (partial) 16 | 19.29 (16.10)* | 15.0.0*
Adding `<=>` to the standard library | P1614R2 | 10 | 14* (partial) 17* (partial) 19 | 19.29 (16.10)* | 13.1.6* (partial)
constexpr default constructor of std::atomic and std::atomic_flag (FTM)* | P0883R2 | 10 | 13 | 19.26* | 13.1.6*
constexpr for numeric algorithms (FTM)* | P1645R1 | 10 | 12 | 19.26* | 13.0.0*
Safe integral comparisons (FTM)* | P0586R2 | 10 | 13 | 19.27* | 13.1.6*
C++20 feature | Paper(s) | GCC libstdc++ | Clang libc++ | MSVC STL | Apple Clang*

## Older standards

- C++17 core language features
- C++17 library features

- C++14 core language features
- C++14 library features

- C++11 core language features
- C++11 library features

### See also

Feature testing (C++20) | A set of preprocessor macros to test the corresponding to C++ language and library features
C documentation for compiler support

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