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Compiler support for C++20 - cppreference.com
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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++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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