Compiler support for C++20
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< cpp | compiler support
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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.
[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* | (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 |