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Showing content from https://cplusplus.com/is_void below:

class template

<type_traits>

std::is_void

template <class T> struct is_void;

Is void

Trait class that identifies whether T is void.

It inherits from integral_constant as being either true_type or false_type: It is true_type when T is void or a cv-qualified void type, and false_type in any other case.

Template parameters

T: A type.

Member types Inherited from integral_constant:

Member constants Inherited from integral_constant:
member constant definition value either true or false
Member functions Inherited from integral_constant:

operator bool: Returns value (public member function)

Example

// is_void example
#include <iostream>
#include <type_traits>

int main() {
  std::cout << std::boolalpha;
  std::cout << "is_void:" << std::endl;
  std::cout << "int: " << std::is_void<int>::value << std::endl;
  std::cout << "void: " << std::is_void<void>::value << std::endl;
  return 0;
}

Output:

is_void:
int: false
void: true