Modern C++ Language Features Compliance Status

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Below are the lists of Modern C++ features that are supported by the RAD Studio C++ compilers.

C++2c Features

Note: C++2c is expected to be C++26.

Note: BCC64X is currently a Preview. The below status is aspirational but untested and is not a guarantee of the final support. BCC64X uses C++17 as its default language level, and the initial release is not planned to support higher language levels. To compile to C++2c, run bcc64x with -std=c++2c.

Feature	C++2c Proposal Document	BCC32C/X	BCC64	BCC64X
Remove undefined behavior from lexing	P2621R2
Making non-encodable string literals ill-formed	P1854R4
Unevaluated strings	P2361R6
Add @, $, and ` to the basic character set	P2558R2
constexpr cast from void*	P2738R1
On the ignorability of standard attributes	P2552R3
Static storage for braced initializers	P2752R3
User-generated static_assert messages	P2741R3
Placeholder variables with no name	P2169R4

C++23 Features

Note: C+23 is partially supported by the Clang version that BCC64X is based on and the C+ RTL and STL (libc+) that it uses. We expect that any language feature supported by both the Clang and the libc+ in versions 15 and earlier, work correctly. But it is not supported, even at the unsupported level that a Preview implies. However, the Preview of the BCC64X compiler currently aims at C+17 as its language standard. You can use -std=c++23 to change the target language compliance.

C++20 Features

Note: C+20 is partially supported by the Clang version that BCC64X is based on and the C+ RTL and STL (libc+) that it uses. We expect that any language feature supported by both the Clang and the libc+ in versions 15 and earlier, work correctly. But it is not supported, even at the unsupported level that a Preview implies. However, the Preview of the BCC64X compiler currently aims at C+17 as its language standard. You can use -std=c++20 to change the target language compliance.

C++17 Features

Note: BCC64X is currently a Preview. The status below is aspirational but not guaranteed for the final release.

Feature	C++17 Proposal Document	BCC32C/X	BCC64	BCC64X
New auto rules for direct-list-initialization	N3922
static_assert with no message	N3928
typename in a template template parameter	N4051
Removing trigraphs	N4086
Nested namespace definition	N4230
Attributes for namespaces and enumerators	N4266
u8 character literals	N4267
Allow constant evaluation for all non-type template arguments	N4268
Fold Expressions	N4295
Remove Deprecated Use of the register Keyword	P0001R1
Remove Deprecated operator++(bool)	P0002R1
Removing Deprecated Exception Specifications from C++17	P0003R5
Make exception specifications part of the type system	P0012R1
Aggregate initialization of classes with base classes	P0017R1
Lambda capture of *this	P0018R3
Using attribute namespaces without repetition	P0028R4
Dynamic memory allocation for over-aligned data	P0035R4
Unary fold expressions and empty parameter packs	P0036R0
__has_include in preprocessor conditionals	P0061R1
Template argument deduction for class templates	P0091R3
Non-type template parameters with auto type	P0127R2
Guaranteed copy elision	P0135R1
New specification for inheriting constructors (DR1941 et al)	P0136R1
Replacement of class objects containing reference members	P0137R1
Direct-list-initialization of enumerations	P0138R2
Stricter expression evaluation order	P0145R3
constexpr lambda expressions	P0170R1
Differing begin and end types in range-based for	P0184R0
[[fallthrough]] attribute	P0188R1
[[nodiscard]] attribute	P0189R1
Pack expansions in using-declarations	P0195R2
[[maybe_unused]] attribute	P0212R1
Structured Bindings	P0217R3
Hexadecimal floating-point literals	P0245R1
Ignore unknown attributes	P0283R2
constexpr if statements	P0292R2
init-statements for if and switch	P0305R1
Inline variables	P0386R2
DR: Matching of template template-arguments excludes compatible templates	P0522R0
std::uncaught_exceptions()	N4259
Improving std::pair and std::tuple	N4387
std::any	P0220R1
std::variant	P0088R3
std::optional	P0220R1
std::shared_mutex (untimed)	N4508
std::string_view	N3921
Standardization of Parallelism TS	P0024R2
Elementary string conversions	P0067R5
Mathematical special functions	P0226R1
Splicing Maps and Sets	P0083R3
Hardware interference size	P0154R1
std::filesystem	P0218R1
std::byte	P0298R3

C++14 Features

Feature	C++14 Proposal Document	BCC32C/X	BCC64
Tweaked wording for contextual conversions	N3323
Binary literals	N3472
decltype(auto), Return type deduction for normal functions	N3638
Initialized/Generalized lambda captures (init-capture)	N3648
Generic (polymorphic) lambda expressions	N3649
Variable templates	N3651
Extended constexpr	N3652
Member initializers and aggregates (NSDMI)	N3653
Clarifying memory allocation (avoiding/fusing allocations)	N3664
[[deprecated]] attribute	N3760
Sized deallocation	N3768
Single quote as digit separator	N3781
std::result_of and SFINAE	N3462
constexpr for <complex>	N3302
constexpr for <chrono>	N3469
constexpr for <array>	N3470
constexpr for <initializer_list>, <utility> and <tuple>	N3471
Improved std::integral_constant	N3545
User-defined literals for <chrono> and <string>	N3642
Null forward iterators	N3644
std::quoted	N3654
Heterogeneous associative lookup	N3657
std::integer_sequence	N3658
std::shared_timed_mutex	N3659
std::exchange	N3668
fixing constexpr member functions without const	N3669
std::get<T>()	N3670
Dual-Range std::equal, std::is_permutation, std::mismatch	N3671

C++11 Features

Feature	C++11 Proposal Document	BCC32C/X	BCC32	BCC64
Rvalue references	N2118
Rvalue references for *this	N2439
Initialization of class objects by rvalues	N1610
Non-static data member initializers	N2756
Variadic templates	N2242
Extending variadic template template parameters	N2555
Initializer lists	N2672
Static assertions	N1720
auto-typed variables	N1984
Multi-declarator auto	N1737
Removal of auto as a storage-class specifier	N2546
New function declarator syntax	N2541
Lambda expressions	N2927
Declared type of an expression	N2343
Incomplete return types	N3276
Right angle brackets	N1757
Default template arguments for function templates	DR226
Solving the SFINAE problem for expressions	DR339
Alias templates	N2258
Extern templates	N1987
Null pointer constant	N2431
Strongly-typed enums	N2347
Forward declarations for enums	N2764 DR1206
Standardized attribute syntax	N2761
Generalized constant expressions	N2235
Alignment support	N2341
Conditionally-support behavior	N1627
Changing undefined behavior into diagnosable errors	N1727
Delegating constructors	N1986
Inheriting constructors	N2540
Explicit conversion operators	N2437
New character types	N2249
Unicode string literals	N2442
Raw string literals	N2442
Universal character names in literals	N2170
User-defined literals	N2765
Standard Layout Types	N2342
Defaulted functions	N2346
Deleted functions	N2346
Extended friend declarations	N1791
Extending sizeof	N2253 DR850
Inline namespaces	N2535
Unrestricted unions	N2544
Local and unnamed types as template arguments	N2657
Range-based for	N2930
Explicit virtual overrides	N2928 N3206 N3272
Minimal support for garbage collection and reachability-based leak detection	N2670
Allowing move constructors to throw [noexcept]	N3050
Defining move special member functions	N3053
Concurrency
Sequence points	N2239
Atomic operations	N2427
Strong Compare and Exchange	N2748
Bidirectional Fences	N2752
Memory model	N2429
Data-dependency ordering: atomics and memory model	N2664
Propagating exceptions	N2179
Allow atomics use in signal handlers	N2547
Thread-local storage	N2659
Dynamic initialization and destruction with concurrency	N2660
C99 Features in C++11
__func__ predefined identifier	N2340
C99 preprocessor	N1653
long long type	N1811
Extended integral types	N1988

See Also

• Modern C++ Features Supported by RAD Studio Clang-enhanced C++ Compilers
• Workaround for C++11 Attributes (Clang-enhanced C++ Compilers)
• C++11 Features in the Classic Compiler