Type support (basic types, RTTI, type traits)
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Basic types
Fundamental types defined by the language
Additional basic types and macros
<cstddef> . | |
| sizeof . (typedef) | |
| (typedef) | |
(C++11) |
nullptr (typedef) |
| (macro constant) | |
(C++11) |
POD type with alignment requirement as great as any other scalar type (typedef) |
| byte offset from the beginning of a standard-layout type to specified member (function macro) | |
<cstdbool> . | |
__bool_true_false_are_defined (C++11) |
C compatibility macro constant, expands to integer constant 1 (macro constant) |
<cstdalign> . | |
__alignas_is_defined (C++11) |
C compatibility macro constant, expands to integer constant 1 (macro constant) |
Fixed width integer types (since C++11)
numeric_limits
<limits> . | |
| . (class template) | |
C numeric limits interface
Runtime type identification
| contains some type's information, generated by the implementation. This is the class, returned by the typeid operator (class) | |
(C++11) |
wrapper around a type_info object, that can be used as index in associative and unordered associative containers (class) |
| typeid . (class) | |
| dynamic_cast . , . (class) |
Type traits (since C++11)
Type traits defines an compile-time template-based interface to query or modify the properties of types.
Type properties
<type_traits> . | |
Primary type categories | |
(C++11) |
void (class template) |
(C++11) |
(class template) |
(C++11) |
(class template) |
(C++11) |
(class template) |
(C++11) |
(class template) |
(C++11) |
(class template) |
(C++11) |
(class template) |
(C++11) |
(class template) |
(C++11) |
(class template) |
(C++11) |
(class template) |
(C++11) |
(class template) |
(C++11) |
(class template) |
(C++11) |
(class template) |
Composite type categories | |
(C++11) |
(class template) |
(C++11) |
checks if a type is arithmetic type (class template) |
(C++11) |
checks if a type is scalar type (class template) |
(C++11) |
checks if a type is object type (class template) |
(C++11) |
checks if a type is compound type (class template) |
(C++11) |
checks if a type is either lvalue reference or rvalue reference (class template) |
(C++11) |
checks if a type is a pointer to a non-static member function or object (class template) |
Type properties | |
(C++11) |
checks if a type is const-qualified (class template) |
(C++11) |
checks if a type is volatile-qualified (class template) |
(C++11) |
checks if a type is trivial (class template) |
(C++11) |
checks if a type is trivially copyable (class template) |
(C++11) |
checks if a type is standard-layout type (class template) |
(C++11) |
checks if a type is plain-old data (POD) type (class template) |
(C++11) |
checks if a type is literal type (class template) |
(C++11) |
checks if a type is class (but not union) type and has no data (class template) |
(C++11) |
checks if a type is polymorphic class type (class template) |
(C++11) |
checks if a type is abstract class type (class template) |
(C++11) |
checks if a type is signed arithmetic type (class template) |
(C++11) |
checks if a type is unsigned arithmetic type (class template) |
Supported operations | |
(C++11) (C++11) (C++11) |
checks if a type has a constructor for specific arguments (class template) |
| checks if a type has a default constructor (class template) | |
(C++11) (C++11) (C++11) |
checks if a type has a copy constructor (class template) |
(C++11) (C++11) (C++11) |
checks if a type has a move constructor (class template) |
(C++11) (C++11) (C++11) |
checks if a type has a assignment operator for a specific argument (class template) |
(C++11) (C++11) (C++11) |
checks if a type has a copy assignment operator (class template) |
(C++11) (C++11) (C++11) |
checks if a type has a move assignment operator (class template) |
(C++11) (C++11) (C++11) |
checks if a type has a non-deleted destructor (class template) |
(C++11) |
checks if a type has a virtual destructor (class template) |
Property queries | |
(C++11) |
obtains the type's alignment requirements (class template) |
(C++11) |
obtains the number of dimensions of an array type (class template) |
(C++11) |
obtains the size of an array type along a specified dimension (class template) |
Type relationships | |
(C++11) |
checks if two types are the same (class template) |
(C++11) |
checks if a type is derived from the other type (class template) |
(C++11) |
checks if a type can be converted to the other type (class template) |
Type modifications
Type modification templates create new type definitions by applying modifications on a template parameter. The resulting type can then be accessed through type member typedef.
<type_traits> . | |
Const-volatility specifiers | |
(C++11) (C++11) (C++11) |
removes const or/and volatile specifiers from the given type (class template) |
(C++11) (C++11) (C++11) |
adds const or/and volatile specifiers to the given type (class template) |
References | |
(C++11) |
removes reference from the given type (class template) |
(C++11) (C++11) |
adds lvalue or rvalue reference to the given type (class template) |
Pointers | |
(C++11) |
removes pointer from the given type (class template) |
(C++11) |
adds pointer to the given type (class template) |
Sign modifiers | |
(C++11) |
makes the given integral type signed (class template) |
(C++11) |
makes the given integral type unsigned (class template) |
Arrays | |
(C++11) |
removes one extent from the given array type (class template) |
(C++11) |
removes all extents from the given array type (class template) |
Miscellaneous transformations
<type_traits> . | |
(C++11) |
defines the type suitable for use as uninitialized storage for types of given size (class template) |
(C++11) |
defines the type suitable for use as uninitialized storage for all given types (class template) |
(C++11) |
applies type transformations as when passing a function argument by value (class template) |
(C++11) |
hides a function overload or template specialization based on compile-time boolean (class template) |
(C++11) |
chooses one type or another based on compile-type boolean (class template) |
(C++11) |
deduces the result type of a mixed-mode arithmetic expression (class template) |
(C++11) |
obtains the underlying integer type for a given enumeration type (class template) |
(C++11) |
deduces the return type of a function call expression (class template) |
Helper classes
<type_traits> . | |
(C++11) |
compile-time constant of specified type with specified value (class template) |
Two specializations of std::integral_constant for the type bool are provided:
<type_traits> . | |
| Type | Definition |
true_type
|
std::integral_constant<bool, true>
|
false_type
|
std::integral_constant<bool, false>
|