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---
features:
- desc: "UB? In My Lexer? (Remove undefined behavior from lexing)"
paper: P2621
support:
- GCC
- Clang 3.3
- Xcode 16
- desc: "Making non-encodable string literals ill-formed"
paper: P1854
support:
- GCC 14
- Clang 14
- Xcode 16
- desc: "[Unevaluated strings](https://en.cppreference.com/w/cpp/language/string_literal.html#Unevaluated_strings)"
paper: P2361
support:
- GCC 14
- Clang 17 (partial)
- Clang 18
- Xcode 16
hints:
- target: Clang 17
msg: "Attributes arguments don't yet parse as unevaluated string literals."
- desc: "Add @, $, and ` to the [basic character set](https://en.cppreference.com/w/cpp/language/charset.html#Basic_character_set)"
paper: P2558
support:
- GCC 15
- Clang
- Xcode 15
- desc: "`constexpr` cast from `void*`: towards `constexpr` type-erasure"
paper: P2738
support:
- GCC 14
- Clang 17
- Xcode 16.3
ftm:
- name: __cpp_constexpr
value: 202306L
- desc: "On the ignorability of standard attributes"
paper: P2552
support:
- GCC 15
- Clang
- Xcode 16.3
- desc: "Static storage for braced initializers"
paper: P2752
support: [GCC 14]
- desc: "User-generated `static_assert` messages"
paper: P2741
content: static-assert-message.md
summary: "`static_assert` can now use user-generated strings, not just string literals."
support:
- GCC 14
- Clang 17
- Xcode 16.3
ftm:
- name: __cpp_static_assert
value: 202306L
- desc: "A nice placeholder with no name (using `_` as a variable name)"
paper: P2169
summary: "The underscore `_` can now be used as a placeholder variable name that doesn't actually bind a name."
support:
- GCC 14
- Clang 18
- Xcode 16.3
ftm:
- name: __cpp_placeholder_variables
value: 202306L
content: placeholder-variable.md
- desc: "Testing for success or failure of `<charconv>` functions"
lib: true
paper: P2497
support: [GCC 14, Clang 18]
ftm:
- name: __cpp_lib_to_chars
value: 202306L
- desc: "Hashing support for `chrono` value classes"
paper: P2592
lib: true
support: [GCC 16, Clang 22]
ftm:
- name: __cpp_lib_chrono
value: 202306L
- desc: "Arithmetic overloads of `std::to_string()` and `std::to_wstring()` use `std::format()`"
paper: P2587
lib: true
support: [GCC 14]
ftm:
- name: __cpp_lib_to_string
value: 202306L
- desc: "`constexpr` stable sorting"
paper: P2562
lib: true
support: [GCC 15, Clang 21]
ftm:
- name: __cpp_lib_constexpr_algorithms
value: 202306L
- desc: "Read-copy update (RCU) (`<rcu>`)"
paper: P2545
summary: "RCU provides efficient concurrent reads with minimal synchronization."
lib: true
ftm:
- name: __cpp_lib_rcu
value: 202306L
- desc: "Hazard pointers (`<hazard_pointer>`)"
paper: P2530
summary: "Hazard pointers enable safe memory reclamation in lock-free data structures."
lib: true
ftm:
- name: __cpp_lib_hazard_pointer
value: 202306L
- desc: "ADL-proof `std::projected`"
paper: P2538
lib: true
support:
- GCC 14
- Clang 18
- MSVC 14.38
- Xcode 16
- desc: "Interfacing `std::stringstream` with `std::string_view`"
paper: P2495
lib: true
support:
- GCC 16
- Clang 19
- Xcode 16.3
ftm:
- name: __cpp_lib_sstream_from_string_view
value: 202306L
- desc: "Formatting pointers"
paper: P2510
content: formatting-pointers.md
lib: true
support:
- GCC 14
- Clang 17
- MSVC 14.40
ftm:
- name: __cpp_lib_format
value: 202304L
- desc: "Freestanding Feature-Test Macros and Implementation-Defined Extensions"
paper: P2198
lib: true
support: [MSVC 14.38]
ftm:
- name: __cpp_lib_freestanding_feature_test_macros
value: 202306L
- name: __cpp_lib_freestanding_functional
value: 202306L
- name: __cpp_lib_freestanding_iterator
value: 202306L
- name: __cpp_lib_freestanding_memory
value: 202306L
- name: __cpp_lib_freestanding_operator_new
value: 202306L
- name: __cpp_lib_freestanding_ranges
value: 202306L
- name: __cpp_lib_freestanding_ratio
value: 202306L
- name: __cpp_lib_freestanding_tuple
value: 202306L
- name: __cpp_lib_freestanding_utility
value: 202306L
- desc: "Freestanding `std::char_traits`, `std::errc` and facilities in: `<charconv>`, `<cstdlib>`, `<cstring>`, `<cwchar>`"
paper: P2338
lib: true
support: [MSVC 14.38]
ftm:
- name: __cpp_lib_freestanding_char_traits
value: 202306L
- name: __cpp_lib_freestanding_charconv
value: 202306L
- name: __cpp_lib_freestanding_cstdlib
value: 202306L
- name: __cpp_lib_freestanding_cstring
value: 202306L
- name: __cpp_lib_freestanding_cwchar
value: 202306L
- name: __cpp_lib_freestanding_errc
value: 202306L
- desc: "Freestanding language: Optional `::operator new`"
paper: P2013
lib: true
support: [MSVC 14.38]
- desc: "Atomic minimum/maximum"
paper: P0493
lib: true
support: [GCC 16]
ftm:
- name: __cpp_lib_atomic_min_max
value: 202403L
- desc: "Extending associative containers with the remaining heterogeneous overloads"
paper: P2363
lib: true
support: [GCC 16]
ftm:
- name: __cpp_lib_associative_heterogeneous_insertion
value: 202306L
keywords:
[
"insert",
"insert_or_assign",
"bucket",
"map",
"set",
"unordered",
"emplace",
"multiset",
"multimap",
]
- desc: "Enabling the use of `std::weak_ptr` as keys in unordered associative containers"
paper: P1901
lib: true
support: [GCC 16]
ftm:
- name: __cpp_lib_smart_ptr_owner_equality
value: 202306L
- desc: "`std::text_encoding`: text encodings identification"
paper: [P1885, P2862]
lib: true
support: [GCC 14]
ftm:
- name: __cpp_lib_text_encoding
value: 202306L
- desc: "`std::function_ref`: type-erased callable reference"
paper: P0792
summary: "A lightweight, non-owning reference to a callable."
lib: true
support: [GCC 16]
ftm:
- name: __cpp_lib_function_ref
value: 202306L
- desc: "Type-checking format args"
paper: P2757
lib: true
support: [GCC 15]
ftm:
- name: __cpp_lib_format
value: 202305L
- desc: "Member `visit` (`std::variant::visit()`)"
paper: P2637
summary: "`std::variant` now has a member `.visit()` function."
lib: true
support:
- GCC 15
- Clang 19
- Xcode 16.3
ftm:
- name: __cpp_lib_variant
value: 202306L
- name: __cpp_lib_format
value: 202306L
- desc: "Checking if a union alternative is active (`std::is_within_lifetime()`)"
paper: P2641
lib: true
ftm:
- name: __cpp_lib_is_within_lifetime
value: 202306L
support: [Clang 22]
- desc: "Native handles and file streams"
paper: P1759
lib: true
support:
- GCC 14
- Clang 18
- Xcode 16
ftm:
- name: __cpp_lib_fstream_native_handle
value: 202306L
- desc: "Interfacing `std::bitset` with `std::string_view`"
paper: P2697
lib: true
support:
- Clang 18
- Xcode 16
- GCC 16
ftm:
- name: __cpp_lib_bitset
value: 202306L
- desc: "More constexpr for `<cmath>` and `<complex>`"
paper: P1383
summary: "More mathematical functions are now `constexpr`, such as `std::sqrt`."
content: more-constexpr-cmath.md
lib: true
support: [GCC 4.6 (partial)]
ftm:
- name: __cpp_lib_constexpr_cmath
value: 202306L
- name: __cpp_lib_constexpr_complex
value: 202306L
- desc: "Adding the new 2022 SI prefixes (`std::quecto`, `std::ronto`, `std::ronna`, `std::quetta`)"
paper: P2734
lib: true
support: [GCC 14, Clang 17 (partial)]
ftm:
- name: __cpp_lib_ratio
value: 202306L
hints:
- target: Clang 17
msg: "Only the feature-testing macro has been added (`__cpp_lib_ratio`)."
- desc: "`std::copyable_function`"
paper: P2548
summary: "A `std::function` variant that guarantees copyability and const-correctness."
content: copyable-function.md
lib: true
ftm:
- name: __cpp_lib_copyable_function
value: 202306L
support: [GCC 16]
- desc: "Bind front and back to NTTP callables (`std::bind_front()`, `std::bind_back()`, `std::not_fn`)"
paper: P2714
lib: true
support: [GCC 16, Clang 20 (partial)]
ftm:
- name: __cpp_lib_bind_front
value: 202306L
desc: "`std::bind_front()` is available"
- name: __cpp_lib_bind_back
value: 202306L
desc: "`std::bind_back()` is available"
- name: __cpp_lib_not_fn
value: 202306L
desc: "`std::not_fn` is available"
- desc: "`std::submdspan()`"
paper: [P2630, P3355]
summary: "Extract sub-views from multidimensional spans."
content: submdspan.md
lib: true
support: [GCC 16]
ftm:
- name: __cpp_lib_submdspan
value: 202306L
- desc: "Template parameter initialization"
paper: P2308
content: template-parameter-init.md
support:
- GCC 9
- Clang 18
- Xcode 16.3
- desc: "[Pack indexing](https://en.cppreference.com/w/cpp/language/pack_indexing.html)"
paper: P2662
summary: "Pack indexing provides direct access to elements in a parameter pack using `...[N]` syntax."
content: pack-indexing.md
support:
- GCC 15
- Clang 19
- Xcode 16.3
ftm:
- name: __cpp_pack_indexing
value: 202311L
- desc: "Remove deprecated arithmetic conversion on enumerations"
paper: P2864
support:
- GCC 14
- Clang 18
- Xcode 16.3
- desc: "Saturation arithmetic"
paper: P0543
summary: "Arithmetic operations that clamp to min/max instead of overflowing."
content: saturation-arithmetic.md
lib: true
support:
- GCC 14
- Clang 18
- Xcode 16
ftm:
- name: __cpp_lib_saturation_arithmetic
value: 202311L
keywords: ["math"]
- desc: "Freestanding library: Partial Classes"
paper: P2407
lib: true
support: [GCC 14, MSVC 14.42]
ftm:
- name: __cpp_lib_freestanding_algorithm
value: 202311L
- name: __cpp_lib_freestanding_array
value: 202311L
- name: __cpp_lib_freestanding_optional
value: 202311L
- name: __cpp_lib_freestanding_string_view
value: 202311L
- name: __cpp_lib_freestanding_variant
value: 202311L
- desc: "Debugging support (`<debugging>`)"
paper: [P2546, P2810]
summary: "The `<debugging>` header provides portable debugging utilities."
lib: true
support: [GCC 16 (hint)]
hints:
- target: GCC 16
msg: "Requires linking with `-lstdc++exp`."
ftm:
- name: __cpp_lib_debugging
value: 202311L
keywords: ["debugger", "breakpoint"]
content: debugging.md
- desc: "Runtime format strings (`std::format()`)"
paper: P2905
content: make-format-args-lvalue.md
lib: true
support:
- GCC 14
- Clang 18
- MSVC 14.40
- Xcode 16
ftm:
- name: __cpp_lib_format
value: 202311L
- desc: "Runtime format strings II (`std::format()`)"
paper: P2918
content: runtime-format.md
lib: true
support:
- GCC 14
- Clang 18
- Xcode 16
ftm:
- name: __cpp_lib_format
value: 202311L
- desc: "Fix formatting of code units as integers (_Dude, where's my char?_)"
paper: P2909
lib: true
support:
- GCC 13.3
- Clang 18
- MSVC 14.40
- Xcode 16
ftm:
- name: __cpp_lib_format_uchar
value: 202311L
- desc: "A new specification for `std::generate_canonical()`"
paper: P0952
lib: true
support: [GCC 16, MSVC 14.42]
- desc: "`std::span` over an initializer list"
paper: P2447
content: span-initializer-list.md
lib: true
support:
- GCC 15
- Clang 18
- Xcode 16
ftm:
- name: __cpp_lib_span_initializer_list
value: 202311L
- desc: "`std::span::at()`"
paper: P2821
content: span-at.md
lib: true
support:
- GCC 14
- Clang 18
- Xcode 16
ftm:
- name: __cpp_lib_span
value: 202311L
- desc: "Remove deprecated `std::allocator` typedef from C++26 (`std::allocator::is_always_equal()`)"
paper: P2868
lib: true
support:
- GCC 15
- Clang 18
- Xcode 16
- desc: "Remove `std::basic_string::reserve()` from C++26"
paper: P2870
summary: "The overload of `std::basic_string::reserve()` with no parameters is removed. It used to be a poor substitute for `std::basic_string::shrink_to_fit()`."
lib: true
support: [Clang 18, Xcode 16]
- desc: "Remove deprecated Unicode conversion facets from C++26 (`<codecvt>`)"
paper: P2871
lib: true
support: [Clang 18, Xcode 16]
- desc: "Add tuple protocol to complex"
paper: P2819
content: complex-tuple-protocol.md
lib: true
support:
- GCC 15
- Clang 19
- Xcode 16.3
ftm:
- name: __cpp_lib_tuple_like
value: 202311L
- desc: "Freestanding: Remove `strtok()`"
paper: P2937
lib: true
support: [GCC 14, MSVC 14.40]
ftm:
- name: __cpp_lib_freestanding_cstring
value: 202311L
- desc: "Freestanding library: `std::inout`, `std::expected`, `std::span`"
paper: P2833
lib: true
support: [GCC 14, MSVC 14.42]
ftm:
- name: __cpp_lib_freestanding_expected
value: 202311L
- name: __cpp_lib_freestanding_mdspan
value: 202311L
- name: __cpp_lib_out_ptr
value: 202311L
- name: __cpp_lib_span
value: 202311L
desc: 'Related: <a href="https://wg21.link/P2821">P2821</a>'
- desc: "`std::basic_const_iterator` should follow its underlying type's convertibility"
paper: [P2836, P2950]
lib: true
support: [GCC 14, MSVC 14.40]
ftm:
- name: __cpp_lib_ranges_as_const
value: 202311L
- desc: "Make `assert()` macro user friendly for C and C++"
paper: P2264
content: assert-variadic.md
lib: true
- desc: "A free function linear algebra interface based on the BLAS (`<linalg>`)"
paper: [P1673, P3050, P3222]
lib: true
ftm:
- name: __cpp_lib_linalg
value: 202311L
keywords: ["math"]
- desc: "Disallow binding a returned [glvalue](https://en.cppreference.com/w/cpp/language/value_category.html#glvalue) to a temporary"
paper: P2748
content: disallow-return-temporary-glvalue.md
support:
- GCC 14
- Clang 19
- Xcode 16.3
- desc: "Clarifying rules for brace elision in [aggregate initialization](https://en.cppreference.com/w/cpp/language/aggregate_initialization.html)"
paper: P3106
support:
- GCC
- Clang 17
- Xcode 16.3
- desc: "Attributes for [structured bindings](https://en.cppreference.com/w/cpp/language/structured_binding.html)"
paper: P0609
support:
- GCC 15
- Clang 19
- Xcode 16.3
ftm:
- name: __cpp_structured_bindings
value: 202403L
- desc: "Module declarations shouldn't be macros"
paper: P3034
support: [GCC 15, Clang 23]
- desc: "Trivial infinite loops are not undefined behavior"
paper: P2809
support:
- GCC 14
- Clang 19
- Xcode 16.3
content: trivial-infinite-loops.md
keywords: ["safety"]
- desc: "Erroneous behavior for uninitialized reads (and `[[indeterminate]]` attribute)"
paper: P2795
support: [GCC 16]
keywords: ["safety"]
- desc: '= delete("should have a reason");'
paper: P2573
summary: "Deleted functions can now include a message explaining why they're deleted."
content: delete-reason.md
support:
- GCC 15
- Clang 19
- Xcode 16.3
ftm:
- name: __cpp_deleted_function
value: 202403L
- desc: "Variadic friends"
paper: P2893
summary: "Class templates can now declare all types in a parameter pack as friends."
support: [GCC 15, Clang 20]
ftm:
- name: __cpp_variadic_friend
value: 202403L
- desc: "Undeprecate `std::polymorphic_allocator::destroy()` for C++26"
paper: P2875
lib: true
support: [GCC 14.3, Clang 15, MSVC 14.41]
- desc: "Remove deprecated strstreams from C++26"
paper: P2867
lib: true
support: [Clang 19]
keywords: ["safety"]
- desc: "Remove deprecated `std::shared_ptr` atomic access APIs from C++26"
paper: P2869
lib: true
- desc: "Remove `std::wstring_convert` from C++26"
paper: P2872
lib: true
support: [Clang 19]
- desc: "Permit an efficient implementation of `std::print()`"
paper: [P3107, P3235]
lib: true
support: [GCC 16, MSVC 14.43]
ftm:
- name: __cpp_lib_print
value: 202403L
keywords: ["format"]
- desc: "Printing blank lines with `std::println()`"
paper: P3142
lib: true
content: println-blank-lines.md
support:
- GCC 14
- Clang 19
- MSVC 14.41
- Xcode 16.3
ftm:
- name: __cpp_lib_print
value: 202403L
keywords: ["format"]
- desc: "Formatting of `filesystem::path` (`std::formatter<filesystem::path>`)"
paper: P2845
lib: true
support: [GCC 16]
ftm:
- name: __cpp_lib_format_path
value: 202403L
- desc: "`views::concat()`"
paper: P2542
lib: true
support: [GCC 15]
ftm:
- name: __cpp_lib_ranges_concat
value: 202403L
- desc: "Concatenation of `std::string` and `std::string_view`"
paper: P2591
lib: true
support:
- GCC 15
- Clang 19
- Xcode 16.3
ftm:
- name: __cpp_lib_string_view
value: 202403L
- desc: "Enabling list-initialization for algorithms"
paper: [P2248, P3217]
lib: true
support: [GCC 15]
ftm:
- name: __cpp_lib_algorithm_default_value_type
value: 202403L
- desc: "Vector API for random number generation (`ranges::generate_random()`)"
paper: P1068
lib: true
ftm:
- name: __cpp_lib_ranges_generate_random
value: 202403L
- desc: "Comparisons for `std::reference_wrapper` (and constraints for comparisons of `std::pair`, `std::tuple`, `std::optional`, and `std::variant`)"
paper: P2944
lib: true
support:
- GCC 14
- Clang 19 (partial)
- Clang 22 (hint)
hints:
- target: Clang 19
msg: "Constrained equality is not implemented."
- target: Clang 22
msg: "The changes to `tuple`'s equality overload from P2165 are not yet implemented."
ftm:
- name: __cpp_lib_constrained_equality
value: 202403L
desc: "Constrained relational operators for `std::pair`, `std::tuple`, `std::optional` and `std::variant`"
- name: __cpp_lib_reference_wrapper
value: 202403L
desc: "Comparisons for `std::reference_wrapper`"
- desc: "Padded `std::mdspan` layouts"
paper: P2642
lib: true
support: [GCC 16]
ftm:
- name: __cpp_lib_submdspan
value: 202403L
- desc: "Better `std::mdspan`'s [CTAD](https://en.cppreference.com/w/cpp/language/class_template_argument_deduction.html)"
paper: P3029
lib: true
support: [GCC 16, Clang 19]
- desc: "`constexpr` placement `new`"
paper: P2747
summary: "Placement `new` can now be used in constant expressions."
support:
- GCC 15
- Clang 20
- Xcode 26
ftm:
- name: __cpp_constexpr
value: 202406L
- name: __cpp_lib_constexpr_new
value: 202406L
- desc: "Deleting a pointer to an incomplete type should be ill-formed"
paper: P3144
support:
- GCC 15
- Clang 19
- Xcode 16.3
- desc: "Ordering of constraints involving fold expressions"
paper: P2963
support: [Clang 19, Xcode 16.3]
ftm:
- name: __cpp_fold_expressions
value: 202406L
- desc: "Structured binding declaration as a condition"
paper: P0963
summary: "Structured bindings can now be used directly in `if` and `while` conditions."
support:
- GCC 15
- Clang 6 (partial)
- Clang 21
hints:
- target: Clang 6
msg: "Supported as an extension, not fully conforming to standardized version."
ftm:
- name: __cpp_structured_bindings
value: 202406L
keywords: ["decompose"]
- desc: "Removing the common reference requirement from the indirectly invocable concepts"
paper: P2997
lib: true
support:
- GCC 15
- Clang 19
- MSVC 14.42
- desc: "dextents index type parameter (`std::dims`)"
paper: P2389
lib: true
support: [GCC 16, Clang 19]
ftm:
- name: __cpp_lib_mdspan
value: 202406L
- desc: "Give `std::optional` range support"
paper: P3168
summary: "`std::optional` is now a range containing zero or one elements."
lib: true
support: [GCC 16, Clang 22]
ftm:
- name: __cpp_lib_optional_range_support
value: 202406L
- desc: "A type trait for detecting virtual base classes (`std::is_virtual_base_of`)"
paper: P2985
lib: true
support:
- GCC 15
- Clang 20
- Xcode 26
ftm:
- name: __cpp_lib_is_virtual_base_of
value: 202406L
- desc: "`std::inplace_vector`: dynamically-resizable vector with fixed capacity (`<inplace_vector>`)"
paper: P0843
summary: "A fixed-capacity vector that stores elements inline without heap allocation."
content: inplace-vector.md
lib: true
support: [GCC 16]
ftm:
- name: __cpp_lib_inplace_vector
value: 202406L
- desc: "Make `std::ignore` a first-class object"
paper: P2968
lib: true
support:
- GCC 15
- Clang 19
- MSVC 14.42
- desc: "Philox as an extension of the C++ RNG engines (`std::philox_engine`)"
paper: P2075
lib: true
ftm:
- name: __cpp_lib_philox_engine
value: 202406L
support: [GCC 16]
keywords: ["random"]
- desc: "`std::execution` (`<execution>`)"
paper: [P2300, P3396]
summary: "A framework for asynchronous and parallel programming based on senders and receivers."
lib: true
ftm:
- name: __cpp_lib_senders
value: 202406L
content: execution.md
- desc: "`constexpr` structured bindings and references to `constexpr` variables"
paper: P2686
support: [GCC 16 (partial), Clang 22 (partial)]
hints:
- target: GCC 16
msg: "No [references to constexpr variables](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117784)."
- target: Clang 22
msg: "References to `constexpr` and decomposition of tuple-like types are not supported (only arrays and aggregates are)."
- desc: "Allowing exception throwing in constant-evaluation (`constexpr` exceptions)"
paper: P3068
summary: "Exceptions can now be thrown and caught during constant evaluation."
content: constexpr-exceptions.md
support: [GCC 16]
ftm:
- name: __cpp_constexpr_exceptions
value: 202411L
- desc: "Deprecate the notion of trivial types (`std::is_trivial` and `std::is_trivial_v`)"
paper: P3247
lib: true
support: [GCC 15, Clang 21]
- desc: "Remove deprecated array comparisons from C++26"
paper: P2865
support:
- GCC 15
- Clang 20
- Xcode 16
keywords: ["safety"]
- desc: "[Structured bindings](https://en.cppreference.com/w/cpp/language/structured_binding.html) can introduce a pack"
paper: P1061
summary: "Structured bindings can now capture remaining elements into a parameter pack."
support: [GCC 16, Clang 21]
ftm:
- name: __cpp_structured_bindings
value: 202411L
- desc: "The Oxford variadic comma"
paper: P3176
support: [GCC 15, Clang 20]
summary: "Variadic ellipsis parameters (`...`) without a separating comma are deprecated, such as `int...`."
content: oxford-variadic-comma.md
- desc: "Retiring niebloids"
paper: P3136
lib: true
support:
- GCC
- Clang 14
- MSVC 14.39
- Xcode 14.3
- desc: "`views::cache_latest()` (`views::cache_latest_view`)"
paper: P3138
summary: "Cache the most recent element for repeated access."
lib: true
support: [GCC 15]
ftm:
- name: __cpp_lib_ranges_cache_latest
value: 202411L
- desc: "Constrain `std::expected` equality operators"
paper: P3379
lib: true
support: [GCC 15, Clang 21]
ftm:
- name: __cpp_lib_constrained_equality
value: 202411L
- desc: "`std::aligned_accessor`: An `std::mdspan` accessor expressing pointer over-alignment (and `std::is_sufficiently_aligned()`)"
paper: P2897
lib: true
support: [GCC 16, Clang 21]
ftm:
- name: __cpp_lib_aligned_accessor
value: 202411L
- desc: "Expose `std::atomic_ref`'s object address (`std::atomic_ref::address()`)"
paper: P2835
lib: true
support: [Clang 22]
ftm:
- name: __cpp_lib_atomic_ref
value: 202411L
- desc: "cv-qualified types in `std::atomic` and `std::atomic_ref`"
paper: P3323
lib: true
support: [GCC 16, MSVC 14.44]
- desc: 'Wording for "`constexpr` for specialized memory algorithms"'
paper: P3508
lib: true
support: [GCC 15]
ftm:
- name: __cpp_lib_raw_memory_algorithms
value: 202411L
- desc: "`constexpr` for `std::uninitialized_default_construct()`"
paper: P3369
lib: true
support: [GCC 15]
ftm:
- name: __cpp_lib_raw_memory_algorithms
value: 202411L
- desc: "Add new library headers from C23 (`<stdbit.h>` and `<stdckdint.h>`)"
paper: P3370
lib: true
support: [GCC 15]
- desc: "`constexpr` `std::atomic` and `std::atomic_ref`"
paper: P3309
lib: true
ftm:
- name: __cpp_lib_constexpr_atomic
value: 202411L
- desc: "`std::simd` (`<simd>`)"
paper: [P1928, P3430, P3287]
summary: "Portable SIMD (Single Instruction, Multiple Data) vector types."
content: simd.md