std::is_void

Defined in header `<type_traits>`
template< class T > struct is_void;		(since C++11)

std::is_void is a UnaryTypeTrait.

Checks whether T is a void type. Provides the member constant value that is equal to true, if T is the type void, const void, volatile void, or const volatile void. Otherwise, value is equal to false.

If the program adds specializations for std::is_void or std::is_void_v, the behavior is undefined.

Template parameters

T

-

a type to check

Helper variable template

template< class T > constexpr bool is_void_v = is_void<T>::value;		(since C++17)

Inherited from std::integral_constant

Member constants

value

[static]

true if T is the type void (possibly cv-qualified), false otherwise
(public static member constant)

Member functions

operator bool	converts the object to bool, returns value (public member function)
operator() (C++14)	returns value (public member function)

Member types

Type	Definition
`value_type`	bool
`type`	std::integral_constant<bool, value>

Possible implementation

template<class T>
struct is_void : std::is_same<void, typename std::remove_cv<T>::type> {};

Example

Run this code

#include <type_traits>
 
void foo();
 
static_assert
(
    std::is_void_v<void> == true and
    std::is_void_v<const void> == true and
    std::is_void_v<volatile void> == true and
    std::is_void_v<void*> == false and
    std::is_void_v<int> == false and
    std::is_void_v<decltype(foo)> == false and
    std::is_void_v<std::is_void<void>> == false
);
 
int main() {}

is_array (C++11)	checks if a type is an array type (class template)
is_pointer (C++11)	checks if a type is a pointer type (class template)
is_enum (C++11)	checks if a type is an enumeration type (class template)
is_union (C++11)	checks if a type is a union type (class template)
is_class (C++11)	checks if a type is a non-union class type (class template)
is_function (C++11)	checks if a type is a function type (class template)
is_object (C++11)	checks if a type is an object type (class template)

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