Std::is_pod (3) Linux Manual Page

std::is_pod – std::is_pod

Synopsis

Defined in header <type_traits>
template< class T > (since C++11)
struct is_pod; (deprecated in C++20)
If T is a PODType ("plain old data type"), that is, both trivial and standard-layout, provides the member constant value equal true. For any other type, value is false.
The behavior is undefined if std::remove_all_extents_t<T> is an incomplete type and not (possibly cv-qualified) void.

Template parameters

T – a type to check

Helper variable template

template< class T > (since C++17)
inline constexpr bool is_pod_v = is_pod<T>::value; (deprecated in C++20)

Inherited from std::integral_constant

Member constants

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

Member functions

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

operator() returns value
(public member function)
(C++14)

Member types

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

Notes

Objects of POD types are fully compatible with the C programming language.

Example

// Run this code

#include <iostream>

#include <type_traits>
struct A {
    int m;
};
struct B {
    int m1;

  private:
    int m2;
};
struct C {
    virtual void foo();
};
int main()

{
    std::cout << std::boolalpha;
    std::cout << std::is_pod<A>::value << '\n';
    std::cout << std::is_pod<B>::value << '\n';
    std::cout << std::is_pod<C>::value << '\n';
}

Output:

  true
  false
  false

std::is_pod (3) Linux Manual Page