Type support (basic types, RTTI)

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Diagnostics library

Memory management library

Metaprogramming library (C++11)

General utilities library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library (C++17)

Concurrency support library (C++11)

Execution control library (C++26)

Technical specifications

Symbols index

External libraries

 

Utilities library

Language support Type support (basic types, RTTI) Library feature-test macros (C++20) Program utilities Variadic functions initializer_list (C++11) is_constant_evaluated (C++20) is_within_lifetime (C++26) source_location (C++20) Coroutine support (C++20) Contract support (C++26) Three-way comparison three_way_comparablethree_way_comparable_with (C++20)(C++20) strong_ordering (C++20) weak_ordering (C++20) partial_ordering (C++20) common_comparison_category (C++20) compare_three_way_result (C++20) compare_three_way (C++20) strong_order (C++20) weak_order (C++20) partial_order (C++20) compare_strong_order_fallback (C++20) compare_weak_order_fallback (C++20) compare_partial_order_fallback (C++20)   is_eqis_ltis_lteq (C++20)(C++20)(C++20)   is_neqis_gtis_gteq (C++20)(C++20)(C++20)

General utilities Function objects Bit manipulation (C++20) C-style bit manipulation (C++26) bitset hash (C++11) Relational operators (deprecated in C++20) rel_ops::operator!=rel_ops::operator>    rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than (C++20)(C++20)(C++20)   cmp_not_equalcmp_greatercmp_greater_than (C++20)(C++20)(C++20) in_range (C++20) Swap and type operations swap ranges::swap (C++20) exchange (C++14) declval (C++11) to_underlying (C++23) forward (C++11) forward_like (C++23) move (C++11) move_if_noexcept (C++11) as_const (C++17) Common vocabulary types pair tuple (C++11) optional (C++17) any (C++17) variant (C++17) tuple_size (C++11) tuple_element (C++11) apply (C++17) make_from_tuple (C++17) expected (C++23)

 

Type support

Basic types
Fixed width integer types (C++11)
Fixed width floating-point types (C++23)
ptrdiff_t size_t max_align_t (C++11)     byte (C++17)	nullptr_t (C++11) offsetof NULL
Numeric limits
numeric_limits
C numeric limits interface
Runtime type information
type_info type_index (C++11)	bad_typeid bad_cast

 

See also type system overview and fundamental types defined by the language.

Additional basic types and macros

Defined in header <cstddef>
size_t	unsigned integer type returned by the sizeof operator (typedef)
ptrdiff_t	signed integer type returned when subtracting two pointers (typedef)
nullptr_t (C++11)	the type of the null pointer literal nullptr (typedef)
NULL	implementation-defined null pointer constant (macro constant)
max_align_t (C++11)	trivial type with alignment requirement as great as any other scalar type (typedef)
offsetof	byte offset from the beginning of a standard-layout type to specified member (function macro)
byte (C++17)	the byte type (enum)

Defined in header <cstdbool>(deprecated) (until C++20)
Defined in header <stdbool.h>
__bool_true_false_are_defined (C++11)(deprecated)	C compatibility macro constant, expands to integer literal 1 (macro constant)
Defined in header <cstdalign>(deprecated) (until C++20)
Defined in header <stdalign.h>
__alignas_is_defined (C++11)(deprecated)	C compatibility macro constant, expands to integer literal 1 (macro constant)
__alignof_is_defined (C++11)(deprecated)	C compatibility macro constant, expands to integer literal 1 (macro constant)

Numeric limits

Defined in header <limits>
numeric_limits	provides an interface to query properties of all fundamental numeric types (class template)

Runtime type identification

Defined in header <typeinfo>
type_info	contains some type’s information, the class returned by the typeid operator (class)
bad_typeid	exception that is thrown if an argument in a typeid expression is null (class)
bad_cast	exception that is thrown by an invalid dynamic_cast expression, i.e. a cast of reference type fails (class)
Defined in header <typeindex>
type_index (C++11)	wrapper around a type_info object, that can be used as index in associative and unordered associative containers (class)

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 4036	C++11	__alignof_is_defined was underspecified in the C++ standard	specified and deprecated

See also

Type traits and metaprogramming library

C documentation for Type support library