# Type support (basic types, RTTI)

From cppreference.com
< cpp

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)

### Fixed width integer types (since C++11)

### Fixed width floating-point types (since C++23)

### Numeric limits

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

#### C numeric limits interface

### Runtime type identification

Defined in header `<typeinfo>`
type_info | contains some type's information, generated by the implementation. This is 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)

### See also

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/types&oldid=144120"