# CMAKE_CXX_KNOWN_FEATURES

List of C++ features known to this version of CMake.

The features listed in this global property may be known to be available to the C++ compiler. If the feature is available with the C++ compiler, it will be listed in the `CMAKE_CXX_COMPILE_FEATURES` variable.

The features listed here may be used with the `target_compile_features()` command. See the `cmake-compile-features(7)` manual for information on compile features and a list of supported compilers.

The features known to this version of CMake are:

`cxx_std_98`

  Compiler mode is at least C++ 98.

`cxx_std_11`

  Compiler mode is at least C++ 11.

`cxx_std_14`

  Compiler mode is at least C++ 14.

`cxx_std_17`

  Compiler mode is at least C++ 17.

`cxx_std_20`

  Compiler mode is at least C++ 20.

`cxx_aggregate_default_initializers`

  Aggregate default initializers, as defined in N3605.

`cxx_alias_templates`

  Template aliases, as defined in N2258.

`cxx_alignas`

  Alignment control `alignas`, as defined in N2341.

`cxx_alignof`

  Alignment control `alignof`, as defined in N2341.

`cxx_attributes`

  Generic attributes, as defined in N2761.

`cxx_attribute_deprecated`

  `[[deprecated]]` attribute, as defined in N3760.

`cxx_auto_type`

  Automatic type deduction, as defined in N1984.

`cxx_binary_literals`

  Binary literals, as defined in N3472.

`cxx_constexpr`

  Constant expressions, as defined in N2235.

`cxx_contextual_conversions`

  Contextual conversions, as defined in N3323.

`cxx_decltype_incomplete_return_types`

  Decltype on incomplete return types, as defined in N3276.

`cxx_decltype`

  Decltype, as defined in N2343.

`cxx_decltype_auto`

  `decltype(auto)` semantics, as defined in N3638.

`cxx_default_function_template_args`

  Default template arguments for function templates, as defined in DR226

`cxx_defaulted_functions`

  Defaulted functions, as defined in N2346.

`cxx_defaulted_move_initializers`

  Defaulted move initializers, as defined in N3053.

`cxx_delegating_constructors`

  Delegating constructors, as defined in N1986.

`cxx_deleted_functions`

  Deleted functions, as defined in N2346.

`cxx_digit_separators`

  Digit separators, as defined in N3781.

`cxx_enum_forward_declarations`

  Enum forward declarations, as defined in N2764.

`cxx_explicit_conversions`

  Explicit conversion operators, as defined in N2437.

`cxx_extended_friend_declarations`

  Extended friend declarations, as defined in N1791.

`cxx_extern_templates`

  Extern templates, as defined in N1987.

`cxx_final`

  Override control `final` keyword, as defined in N2928, N3206 and N3272.

`cxx_func_identifier`

  Predefined `__func__` identifier, as defined in N2340.

`cxx_generalized_initializers`

  Initializer lists, as defined in N2672.

`cxx_generic_lambdas`

  Generic lambdas, as defined in N3649.

`cxx_inheriting_constructors`

  Inheriting constructors, as defined in N2540.

`cxx_inline_namespaces`

  Inline namespaces, as defined in N2535.

`cxx_lambdas`

  Lambda functions, as defined in N2927.

`cxx_lambda_init_captures`

  Initialized lambda captures, as defined in N3648.

`cxx_local_type_template_args`

  Local and unnamed types as template arguments, as defined in N2657.

`cxx_long_long_type`

  `long long` type, as defined in N1811.

`cxx_noexcept`

  Exception specifications, as defined in N3050.

`cxx_nonstatic_member_init`

  Non-static data member initialization, as defined in N2756.

`cxx_nullptr`

  Null pointer, as defined in N2431.

`cxx_override`

  Override control `override` keyword, as defined in N2928, N3206 and N3272.

`cxx_range_for`

  Range-based for, as defined in N2930.

`cxx_raw_string_literals`

  Raw string literals, as defined in N2442.

`cxx_reference_qualified_functions`

  Reference qualified functions, as defined in N2439.

`cxx_relaxed_constexpr`

  Relaxed constexpr, as defined in N3652.

`cxx_return_type_deduction`

  Return type deduction on normal functions, as defined in N3386.

`cxx_right_angle_brackets`

  Right angle bracket parsing, as defined in N1757.

`cxx_rvalue_references`

  R-value references, as defined in N2118.

`cxx_sizeof_member`

  Size of non-static data members, as defined in N2253.

`cxx_static_assert`

  Static assert, as defined in N1720.

`cxx_strong_enums`

  Strongly typed enums, as defined in N2347.

`cxx_thread_local`

  Thread-local variables, as defined in N2659.

`cxx_trailing_return_types`

  Automatic function return type, as defined in N2541.

`cxx_unicode_literals`

  Unicode string literals, as defined in N2442.

`cxx_uniform_initialization`

  Uniform initialization, as defined in N2640.

`cxx_unrestricted_unions`

  Unrestricted unions, as defined in N2544.

`cxx_user_literals`

  User-defined literals, as defined in N2765.

`cxx_variable_templates`

  Variable templates, as defined in N3651.

`cxx_variadic_macros`

  Variadic macros, as defined in N1653.

`cxx_variadic_templates`

  Variadic templates, as defined in N2242.

`cxx_template_template_parameters`

  Template template parameters, as defined in `ISO/IEC 14882:1998`.