features_cpp17.yaml

---
features:
  - desc: "New Rules for `auto` deduction from braced-init-list"
    paper: N3922
    support:
      - GCC 5
      - Clang 3.8
      - MSVC 14.0
      - Xcode
      - R++

  - desc: "Allow `typename` in a template template parameter"
    paper: N4051
    support:
      - GCC 5
      - Clang 3.5
      - MSVC 14.0
      - Xcode
      - R++

  - desc: "Removing trigraphs??!"
    paper: N4086
    support:
      - GCC 5
      - Clang 3.5
      - MSVC 10.0
      - Xcode
      - R++

  - desc: "Nested `namespace` definition"
    paper: N4230
    summary: "Define nested namespaces with single declaration."
    support:
      - GCC 6
      - Clang 3.6
      - MSVC 14.0
      - Xcode
      - R++
    content: nested-namespaces.md

  - desc: "Extending `static_assert`, v2"
    paper: N3928
    support:
      - GCC 6
      - Clang 2.5
      - MSVC 14.10
      - Xcode
      - R++
    ftm:
      - name: __cpp_static_assert
        value: 201411L
        desc: "`static_assert()` with no message (single argument)"

  - desc: "Attributes for namespaces and enumerators"
    paper: N4266
    support:
      - tool: GCC 4.9
        status: partial
        note: "Only attributes for namespaces are supported."
      - GCC 6
      - Clang 3.6
      - MSVC 14.0
      - Xcode
      - R++
    ftm:
      - name: __cpp_enumerator_attributes
        value: 201411L
        desc: Attributes for enumerators are supported
      - name: __cpp_namespace_attributes
        value: 201411L
        desc: Attributes for namespaces are supported

  - desc: "Adding `u8` character literals"
    paper: N4267
    support:
      - GCC 6
      - Clang 3.6
      - MSVC 14.0
      - Xcode
      - R++
    ftm:
      - name: __cpp_nontype_template_args
        value: 201411L
        desc: Allow constant evaluation for all constant template arguments

  - desc: "Allow constant evaluation for all non-type template arguments"
    paper: N4268
    support:
      - GCC 6
      - Clang 3.6
      - MSVC 14.12
      - Xcode

  - desc: "Unary folds and empty parameter packs"
    paper: P0036
    support:
      - GCC 6
      - Clang 3.9
      - MSVC 14.12
      - Xcode

  - desc: "Remove deprecated use of the `register` keyword"
    paper: P0001
    support:
      - GCC 7
      - Clang 3.8
      - MSVC 14.11
      - Xcode
      - R++

  - desc: "Remove deprecated `operator++(bool)`"
    paper: P0002
    support:
      - GCC 7
      - Clang 3.8
      - MSVC 14.11
      - Xcode
      - R++

  - desc: "Make exception specifications be part of the type system"
    paper: P0012
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.12
      - Xcode
      - R++
    ftm:
      - name: __cpp_noexcept_function_type
        value: 201510L

  - desc: "`__has_include`"
    paper: P0061
    summary: "Check if a header file exists."
    support:
      - GCC 5
      - Clang
      - MSVC 14.11
      - Xcode
      - R++

  - desc: "Rewording inheriting constructors"
    paper: P0136
    support:
      - GCC 7
      - Clang 3.9
      - tool: MSVC 14.14
        note: "Not supported in C++14 mode."
      - Xcode
      - tool: R++
        status: unsupported
    ftm:
      - name: __cpp_inheriting_constructors
        value: 201511L

  - desc: "Extension to aggregate initialization"
    paper: P0017
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.14
      - Xcode
      - R++
    ftm:
      - name: __cpp_aggregate_bases
        value: 201603L

  - desc: "Folding expressions"
    paper: N4295
    summary: "Reduce parameter packs with operators."
    content: fold-expressions.md
    support:
      - GCC 6
      - Clang 3.6
      - MSVC 14.12
      - Xcode
      - R++
    ftm:
      - name: __cpp_fold_expressions
        value: 201603L

  - desc: "Lambda capture of `*this` by value as `[=, *this]`"
    paper: P0018
    summary: "Capture the current object by value with `[*this]`."
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.11
      - Xcode
      - R++

  - desc: "Construction rules for `enum class` values"
    paper: P0138
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.11
      - Xcode
      - R++

  - desc: "`constexpr` lambdas"
    paper: P0170
    summary: "Lambdas can be used in constant expressions."
    support:
      - GCC 7
      - Clang 5
      - MSVC 14.11
      - Xcode
      - R++
    ftm:
      - name: __cpp_constexpr
        value: 201603L

  - desc: "Generalizing the range-based `for` loop"
    paper: P0184
    support:
      - GCC 6
      - Clang 3.9
      - MSVC 14.10
      - Xcode
      - R++
    ftm:
      - name: __cpp_range_based_for
        value: 201603L

  - desc: "Attribute `[[fallthrough]]`"
    paper: P0188
    summary: "Indicate intentional switch case fallthrough."
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.10
      - Xcode
      - R++

  - desc: "Attribute `[[nodiscard]]`"
    paper: P0189
    summary: "Warn when return value is discarded."
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.11
      - Xcode
      - R++

  - desc: "Attribute `[[maybe_unused]]`"
    paper: P0212
    summary: "Suppress warnings for unused entities."
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.11
      - Xcode
      - R++

  - desc: "Hexadecimal floating literals"
    paper: P0245
    support:
      - GCC 3
      - Clang
      - MSVC 14.11
      - Xcode
      - R++
    ftm:
      - name: __cpp_hex_float
        value: 201603L

  - desc: "Using attribute namespaces without repetition"
    paper: P0028
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.11
      - Xcode
      - R++

  - desc: "Dynamic memory allocation for over-aligned data"
    paper: P0035
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.12
      - Xcode 10
      - R++
    ftm:
      - name: __cpp_aligned_new
        value: 201606L

  - desc: "Declaring non-type template parameters with `auto`"
    paper: P0127
    summary: "Use `auto` to deduce non-type template parameter types."
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.14
      - Xcode
      - R++
    ftm:
      - name: __cpp_nontype_template_parameter_auto
        value: 201606L

  - desc: "Guaranteed copy elision"
    paper: P0135
    summary: "Certain copies must be elided, not just allowed."
    content: guaranteed-copy-elision.md
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.13
      - Xcode
      - R++
    ftm:
      - name: __cpp_guaranteed_copy_elision
        value: 201606L

  - desc: "Replacement of class objects containing reference members"
    paper: P0137
    support:
      - GCC 7
      - Clang 6
      - MSVC 14.14
      - Xcode
      - R++

  - desc: "Refining expression evaluation order for idiomatic C++"
    paper: P0145
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.14
      - Xcode
      - R++

  - desc: "Proposed wording for structured bindings"
    paper: P0217
    summary: "Decompose objects into named variables."
    content: structured-bindings.md
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.11
      - Xcode
      - R++
    ftm:
      - name: __cpp_structured_bindings
        value: 201606L

  - desc: "Standard and non-standard attributes (ignoring unknown attributes)"
    paper: P0283
    support:
      - GCC
      - Clang 3.9
      - MSVC 14.0
      - Xcode
      - R++

  - desc: "`constexpr if` statements"
    paper: P0292
    summary: "Compile-time conditional compilation within functions."
    content: if-constexpr.md
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.11
      - Xcode
      - R++
    ftm:
      - name: __cpp_if_constexpr
        value: 201606L

  - desc: "Init-statements for `if` and `switch`"
    paper: P0305
    summary: "Initialize variables within if/switch statements."
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.11
      - Xcode
      - R++

  - desc: "`inline` variables"
    paper: P0386
    summary: "Variables can be `inline`, allowing definition in headers."
    content: inline-variables.md
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.12
      - Xcode
      - R++
    ftm:
      - name: __cpp_inline_variables
        value: 201606L

  - desc: "Removing deprecated exception specifications from C++17"
    paper: P0003
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.12
      - Xcode
      - R++

  - desc: "Pack expansions in `using`-declarations"
    paper: P0195
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.14
      - Xcode
      - R++
    ftm:
      - name: __cpp_variadic_using
        value: 201611L

  - desc: "Matching of `template` template-arguments excludes compatible templates"
    paper: P0522
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.12
      - Xcode
      - tool: R++
        status: unsupported
        issue: RSCPP-25151
    ftm:
      - name: __cpp_template_template_args
        value: 201611L

  - desc: "Template argument deduction for class templates ([CTAD](https://cppreference.com/cpp/language/class_template_argument_deduction))"
    paper: P0091
    summary: "Deduce template arguments from constructor arguments."
    content: ctad.md
    support:
      - GCC 7
      - Clang 5
      - MSVC 14.14
      - Xcode
      - R++
    ftm:
      - name: __cpp_deduction_guides
        value: 201703L

  - desc: "`std::void_t`"
    paper: N3911
    lib: true
    support:
      - GCC 6
      - Clang 3.6
      - MSVC 14.0
      - Xcode
    ftm:
      - name: __cpp_lib_void_t
        value: 201411L

  - desc: "`std::uncaught_exceptions()`"
    paper: N4259
    lib: true
    support:
      - GCC 6
      - Clang 3.6
      - MSVC 14.0
      - Xcode
    ftm:
      - name: __cpp_lib_uncaught_exceptions
        value: 201411L

  - desc: "`std::size()`, `std::empty()` and `std::data()`"
    paper: N4280
    lib: true
    support:
      - GCC 6
      - Clang 3.6
      - MSVC 14.0
      - Xcode
    ftm:
      - name: __cpp_lib_nonmember_container_access
        value: 201411L

  - desc: "Cleaning-up `noexcept` in the library"
    paper: N4258
    lib: true
    support:
      - GCC 6
      - Clang 3.7
      - MSVC 14.0
      - Xcode 26.4
    ftm:
      - name: __cpp_lib_allocator_traits_is_always_equal
        value: 201411L

  - desc: "`std::invoke()`"
    paper: N4169
    lib: true
    support:
      - GCC 6
      - Clang 3.7
      - MSVC 14.0
      - Xcode
    ftm:
      - name: __cpp_lib_invoke
        value: 201411L

  - desc: "`try_emplace()` and `insert_or_assign()` for `std::map` and `std::unordered_map`"
    paper: N4279
    lib: true
    support:
      - GCC 6
      - Clang 3.7
      - MSVC 14.0
      - Xcode
    ftm:
      - name: __cpp_lib_map_try_emplace
        value: 201411L
        desc: "`std::map::try_emplace()` and `std::map::insert_or_assign()`"
      - name: __cpp_lib_unordered_map_try_emplace
        value: 201411L
        desc: "`std::unordered_map::try_emplace()` and `std::unordered_map::insert_or_assign()`"

  - desc: "Improving `std::pair` and `std::tuple`"
    paper: N4387
    lib: true
    support:
      - GCC 6
      - Clang 4
      - MSVC 14.0
      - Xcode

  - desc: "`std::bool_constant`"
    paper: N4389
    lib: true
    support:
      - GCC 6
      - Clang 4
      - MSVC 14.0
      - Xcode
    ftm:
      - name: __cpp_lib_bool_constant
        value: 201505L

  - desc: "`std::shared_mutex`"
    paper: N4508
    lib: true
    support:
      - GCC 6
      - Clang 3.7
      - MSVC 14.0
      - Xcode
    ftm:
      - name: __cpp_lib_shared_mutex
        value: 201505L

  - desc: "Minimal incomplete type support for `std::forward_list`, `std::list` and `std::vector`"
    paper: N4510
    lib: true
    support:
      - GCC 3
      - Clang 3.6
      - MSVC 12.0
      - Xcode
    ftm:
      - name: __cpp_lib_incomplete_container_elements
        value: 201505L

  - desc: "Adopt type traits variable templates from library fundamentals TS for C++17"
    paper: P0006
    lib: true
    support:
      - GCC 7
      - Clang 3.8
      - MSVC 14.0
      - Xcode
    ftm:
      - name: __cpp_lib_type_trait_variable_templates
        value: 201510L

  - desc: "Logical operator type traits"
    paper: P0013
    lib: true
    support:
      - GCC 6
      - Clang 3.8
      - MSVC 14.0
      - Xcode
    ftm:
      - name: __cpp_lib_logical_traits
        value: 201510L

  - desc: "Constant View: A proposal for a `std::as_const()` helper function template"
    paper: P0007
    lib: true
    support:
      - GCC 7
      - Clang 3.8
      - MSVC 14.0
      - Xcode

  - desc: "Rounding functions for `chrono::duration` and `chrono::time_point`"
    paper: P0092
    lib: true
    support:
      - GCC 7
      - Clang 3.8
      - MSVC 14.0
      - Xcode
    ftm:
      - name: __cpp_lib_chrono
        value: 201510L

  - desc: "Making `std::owner_less` more flexible (`std::owner_less<void>`)"
    paper: P0074
    lib: true
    support:
      - GCC 7
      - Clang 3.8
      - MSVC 14.0
      - Xcode
    ftm:
      - name: __cpp_lib_transparent_operators
        value: 201510L

  - desc: "`std::not_fn`"
    paper: [P0005, P0358]
    lib: true
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.12
      - Xcode
    ftm:
      - name: __cpp_lib_not_fn
        value: 201603L

  - desc: "The parallelism TS should be standardized (parallel algorithms)"
    paper: P0024
    content: parallel-algorithms.md
    lib: true
    support:
      - GCC 9
      - Clang 17 (partial)
      - MSVC 14.14
    ftm:
      - name: __cpp_lib_execution
        value: 201603L
      - name: __cpp_lib_parallel_algorithm
        value: 201603L

  - desc: "`std::clamp()`"
    paper: P0025
    lib: true
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.0
      - Xcode 10
    ftm:
      - name: __cpp_lib_clamp
        value: 201603L

  - desc: "(`nothrow`-)swappable traits"
    paper: P0185
    lib: true
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.0
      - Xcode 10
    ftm:
      - name: __cpp_lib_is_swappable
        value: 201603L

  - desc: "Polymorphic memory resources"
    paper: P0220
    lib: true
    support:
      - GCC 9
      - Clang 16
      - MSVC 14.13
      - Xcode 15
    ftm:
      - name: __cpp_lib_memory_resource
        value: 201603L

  - desc: "[Searchers](https://cppreference.com/cpp/functional#Searchers), `std::apply()` and `std::sample()`"
    paper: P0220
    lib: true
    support:
      - GCC 7
      - Clang 16
      - MSVC 14.13
      - Xcode
    ftm:
      - name: __cpp_lib_apply
        value: 201603L
        desc: "std::apply()"
      - name: __cpp_lib_boyer_moore_searcher
        value: 201603L
        desc: "Searchers"
      - name: __cpp_lib_sample
        value: 201603L
        desc: "std::sample()"

  - desc: "[Mathematical special functions](https://cppreference.com/cpp/numeric/special_math)"
    paper: P0226
    lib: true
    support: [GCC 7, MSVC 14.14]
    ftm:
      - name: __cpp_lib_math_special_functions
        value: 201603L

  - desc: "`constexpr` `std::addressof()`"
    paper: LWG2296
    lib: true
    support:
      - GCC 7
      - Clang
      - MSVC 14.0
      - tool: Xcode 15
        note: "Supported, but the feature-testing macro (`__cpp_lib_addressof_constexpr`) is not set."
    ftm:
      - name: __cpp_lib_addressof_constexpr
        value: 201603L

  - desc: "`constexpr` for `std::reverse_iterator`, `std::move_iterator`, `std::array` and range access"
    paper: P0031
    lib: true
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.11
      - Xcode
    ftm:
      - name: __cpp_lib_array_constexpr
        value: 201603L

  - desc: "`constexpr` `std::atomic::is_always_lock_free()`"
    paper: P0152
    lib: true
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.11
      - Xcode
    ftm:
      - name: __cpp_lib_atomic_is_always_lock_free
        value: 201603L

  - desc: "`std::enable_shared_from_this::weak_from_this()`"
    paper: P0033
    lib: true
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.12
      - Xcode
    ftm:
      - name: __cpp_lib_enable_shared_from_this
        value: 201603L

  - desc: "3-argument overload of `std::hypot()`"
    paper: P0030
    lib: true
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.14
      - Xcode
    ftm:
      - name: __cpp_lib_hypot
        value: 201603L

  - desc: "`std::byte`"
    paper: P0298
    summary: "A type for raw memory representation."
    lib: true
    support:
      - GCC 7
      - Clang 5
      - MSVC 14.11
      - Xcode
    ftm:
      - name: __cpp_lib_byte
        value: 201603L

  - desc: "`std::string_view`"
    paper: [N3921, P0220, P0254, P0403]
    summary: "Non-owning reference to a character sequence."
    content: string-view.md
    lib: true
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.11
      - Xcode 10
    ftm:
      - name: __cpp_lib_string_view
        value: 201606L

  - desc: "`std::any`"
    paper: [P0220, P0032]
    content: any.md
    lib: true
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.10
      - Xcode 10
    ftm:
      - name: __cpp_lib_any
        value: 201606L

  - desc: "`std::optional`"
    paper: P0220
    summary: "A wrapper that may or may not hold a value."
    content: optional.md
    lib: true
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.10
      - Xcode 10
    ftm:
      - name: __cpp_lib_optional
        value: 201606L

  - desc: "C++17 should refer to C11 instead of C99"
    paper: P0063
    lib: true
    support:
      - GCC 9
      - Clang 7
      - MSVC 14.0 (partial)
      - MSVC 14.28
      - Xcode 10

  - desc: "Splicing maps and sets (`std::map::extract()`, `std::map::merge()` etc)"
    paper: P0083
    lib: true
    support:
      - GCC 7
      - Clang 8
      - MSVC 14.12
      - Xcode 10
    ftm:
      - name: __cpp_lib_node_extract
        value: 201606L

  - desc: "`emplace()` return type in containers (instead of `void`)"
    paper: P0084
    lib: true
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.11
      - Xcode

  - desc: "`std::variant`"
    paper: P0088
    summary: "Type-safe discriminated union."
    content: variant.md
    lib: true
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.10
      - Xcode 10
    ftm:
      - name: __cpp_lib_variant
        value: 201606L

  - desc: "`std::make_from_tuple()`"
    paper: P0209
    lib: true
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.10
      - Xcode
    ftm:
      - name: __cpp_lib_make_from_tuple
        value: 201606L

  - desc: "`std::has_unique_object_representations`"
    paper: P0258
    lib: true
    support:
      - GCC 7
      - Clang 6
      - MSVC 14.11
      - Xcode
    ftm:
      - name: __cpp_lib_has_unique_object_representations
        value: 201606L

  - desc: "`std::gcd()` and `std::lcm()`"
    paper: P0295
    lib: true
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.11
      - Xcode
    ftm:
      - name: __cpp_lib_gcd_lcm
        value: 201606L

  - desc: "Replacement of class objects containing reference members (`std::launder()`)"
    paper: P0137
    lib: true
    support:
      - GCC 7
      - Clang 6
      - MSVC 14.14
      - Xcode
    ftm:
      - name: __cpp_lib_launder
        value: 201606L

  - desc: "[Extending memory management tools](https://cppreference.com/cpp/memory#Uninitialized_storage)"
    paper: P0040
    lib: true
    support:
      - GCC 7
      - tool: Clang 4
        status: partial
        note: "The parallel versions (`std::execution::par`) are not implemented yet. ([Issue](https://github.com/llvm/llvm-project/issues/103640))"
      - MSVC 14.11
      - tool: Xcode 15
        status: partial
        note: "The parallel versions (`std::execution::par`) are not implemented yet. ([Issue](https://github.com/llvm/llvm-project/issues/103640))"
    ftm:
      - name: __cpp_lib_raw_memory_algorithms
        value: 201606L

  - desc: "`std::shared_ptr::weak_type`"
    paper: P0163
    lib: true
    support:
      - GCC 7
      - Clang 3.9
      - MSVC 14.10
      - Xcode
    ftm:
      - name: __cpp_lib_shared_ptr_weak_type
        value: 201606L

  - desc: "Elementary string conversions (`std::to_chars()` and `std::from_chars()`)"
    paper: P0067
    content: to-chars.md
    lib: true
    support:
      - tool: GCC 8
        status: partial
        note: "No support for floating-point types, only integer types."
      - GCC 11
      - tool: Clang 7
        status: partial
        note: "Adds `std::to_chars()` and `std::from_chars()` support for integer types."
      - tool: Clang 14
        status: partial
        note: "Adds only `std::to_chars()` support for `float` and `double`."
      - tool: Clang 20
        status: partial
        note: "Adds `std::from_chars()` support for `float` and `double`. Support is complete except for `long double`.\n\nIn total, the current status is:\n\n| Type             | `to_chars` | `from_chars` |\n|------------------|------------|--------------|\n| integers         | libc++ 7   | libc++ 7     |\n| `float`/`double` | libc++ 14  | libc++ 20    |\n| `long double`    | -          | -            |\n\n---\n\n**Note**: Calling both functions with `long double` falls back to the `double` overload."
      - tool: MSVC 14.14
        status: partial
        note: "No support for floating-point types, only integer types."
      - tool: MSVC 14.15
        status: partial
        note: "Adds `std::from_chars()` support for `float` and `double`."
      - tool: MSVC 14.16
        status: partial
        note: "Adds shortest round-trip decimal overloads of floating-point `std::to_chars()`, e.g. `\"%.8e\"` and `\"%.16e\"`."
      - MSVC 14.24
      - tool: Xcode 10
        status: partial
        note: "No support for floating-point types, only integer types."
      - tool: Xcode 14.3
        status: partial
        note: "Adds support for floating-point types."
    ftm:
      - name: __cpp_lib_to_chars
        value: 201611L

  - desc: "`std::shared_ptr` and `std::weak_ptr` with array support"
    paper: P0414
    lib: true
    support:
      - GCC 7
      - Clang 11
      - MSVC 14.12
      - Xcode 12

  - desc: "`constexpr` for all member functions of `chrono::duration` and `chrono::time_point`"
    paper: P0505
    lib: true
    support:
      - GCC 7
      - Clang 4
      - MSVC 14.11
      - Xcode
    ftm:
      - name: __cpp_lib_chrono
        value: 201611L

  - desc: "`std::shared_ptr<T[]>`"
    paper: P0497
    lib: true
    support:
      - GCC 5
      - Clang 11
      - MSVC 14.12
      - tool: Xcode 15
        note: "Supported, but the feature-testing macro (`__cpp_lib_shared_ptr_arrays`) is not set."
    ftm:
      - name: __cpp_lib_shared_ptr_arrays
        value: 201611L

  - desc: "`constexpr` `std::char_traits`"
    paper: P0426
    lib: true
    support:
      - GCC 8
      - Clang 4
      - MSVC 14.14
      - Xcode
    ftm:
      - name: __cpp_lib_constexpr_string
        value: 201611L

  - desc: "File system library (`std::filesystem` and `<filesystem>`)"
    paper: [P0218, P0219]
    summary: "Standard library for file and directory operations."
    content: filesystem.md
    lib: true
    support:
      - GCC 8
      - Clang 7
      - MSVC 14.14
      - Xcode 11
    ftm:
      - name: __cpp_lib_filesystem
        value: 201703L

  - desc: "[Hardware interference size](https://cppreference.com/cpp/thread/hardware_destructive_interference_size) (reading cache line size)"
    paper: P0154
    lib: true
    support:
      - GCC 12
      - Clang 15 (partial)
      - Clang 19
      - MSVC 14.11
      - tool: Xcode 16.3
        note: "Supported, but the feature-testing macro (`__cpp_lib_hardware_interference_size`) is not set."
    ftm:
      - name: __cpp_lib_hardware_interference_size
        value: 201703L

  - desc: "`std::scoped_lock`"
    paper: P0156
    lib: true
    support:
      - GCC 7
      - Clang 5
      - MSVC 14.11
      - Xcode
    ftm:
      - name: __cpp_lib_scoped_lock
        value: 201703L

  - desc: "`std::is_aggregate`"
    paper: LWG2911
    lib: true
    support:
      - GCC 7
      - Clang 5
      - MSVC 14.15
      - Xcode
    ftm:
      - name: __cpp_lib_is_aggregate
        value: 201703L

  - desc: "`std::is_invocable` and `std::invoke_result`"
    paper: P0604
    lib: true
    support:
      - GCC 7
      - Clang
      - MSVC 14.11
      - Xcode
    ftm:
      - name: __cpp_lib_is_invocable
        value: 201703L

  - desc: "`std::hash<filesystem::path>`"
    paper: LWG3657
    lib: true
    support:
      - GCC 11.4
      - Clang 17
      - MSVC 14.32
      - Xcode 15