template< class T >
struct is_void;
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< class T >
constexpr bool is_void_v = is_void<T>::value;
T is the type void (possibly cv-qualified), false otherwise
#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<const volatile void> == true and
std::is_void_v<std::void_t<>> == 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() {}[edit] See also checks if a type is an array type
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