Compiler support for C++20
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< cpp | compiler support
* - 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.
[edit] 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* | 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)* | 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)* | 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** |
10.0.1* (partial) | 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 |
[edit] 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* | ||
| 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* |
