std::is_scalar

From cppreference.com

Defined in header `<type_traits>`

template< class T > struct is_scalar;		(since C++11)

If T is a scalar type (that is, arithmetic type, enumeration type, pointer, pointer to member, or std::nullptr_t, including any cv-qualified variants), provides the member constant value equal true. For any other type, value is false.

Inherited from std::integral_constant

Member constants


value [static]	true if `T` is a scalar type , false otherwise (public static member constant)

Member functions


operator bool	converts the object to bool, returns `value` (public member function)

Member types


Type	Definition

`value_type`	`bool`

`type`	std::integral_constant<bool, value>

[edit] Notes

Each individual memory location in the C++ memory model, including the hidden memory locations used by language features (e.g virtual table pointer), has scalar type (or is a sequence of adjacent bit-fields of non-zero length). Sequencing of side-effects in expression evaluation, interthread synchronization, and dependency ordering are all defined in terms of individual scalar objects.

[edit] Possible implementation

template< class T >
struct is_scalar : std::integral_constant<bool,
                     std::is_arithmetic<T>::value     ||
                     std::is_enum<T>::value           ||
                     std::is_pointer<T>::value        ||
                     std::is_member_pointer<T>::value ||
                     std::is_same<std::nullptr_t, typename std::remove_cv<T>::type>::value> {};

[edit] Example

run this code

#include <iostream>
#include <type_traits>
 
int main() {
    class cls {};
    std::cout << (std::is_scalar<int>::value
                     ? "T is scalar"
                     : "T is not a scalar") << '\n';
    std::cout << (std::is_scalar<cls>::value
                     ? "T is scalar"
                     : "T is not a scalar") << '\n';
}

Output:

T is scalar
T is not a scalar

[edit] See also


is_arithmetic (C++11)	checks if a type is arithmetic type (class template)

is_enum (C++11)	checks if a type is an enumeration type (class template)

is_pointer (C++11)	checks if a type is a pointer type (class template)

is_member_pointer (C++11)	checks if a type is a pointer to a non-static member function or object (class template)

Language
Standard library headers
Concepts
Utilities library
Strings library
Containers library
Algorithms library
Iterators library
Numerics library
Input/output library
Localizations library
Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)