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C++ compiler support - cppreference.com
The following tables present compiler support for new C++ features. These include accepted revisions to the standard, as well as various technical specifications:
* - 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.
Note that this list may change, as the draft C++26/2c standard evolves.
C++26 feature Paper(s) 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 16 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 typeâs 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::expected equality operators (FTM)* P3379R0 15 std::aligned_accessor: an std::mdspan accessor expressing pointer over-alignment (FTM)* P2897R7 21 std::is_sufficiently_aligned: checks a pointerâs 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* constexpr std::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)* (FTM)* (FTM)* (FTM)*
P3372R3 constexpr std::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)* (FTM)* (FTM)* (FTM)* (FTM)* (FTM)* (FTM)* P3471R4 15 (partial)* 19.44* (partial)* Freestanding library: <algorithm>, <numeric>, <random>, (<execution>, <memory>)
(FTM)* (FTM)* (FTM)* (FTM)* (FTM)* P2976R1 DR20: Converting contiguous iterators to pointers P3349R0 15
C++26 feature
Paper(s)
C++23 feature Paper(s) 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 âC headersâ 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)* 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)* 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 21 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 15 (partial)*
15.2 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 18 (partial)*
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 views 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)
C++20 feature Paper(s) 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 19.20* 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 19.20* 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 Constant 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 19.28 (16.9)* 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 constant 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)
C++20 feature Paper(s) 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_stringbufâs 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 (16.9)* 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)
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