std::is_pod

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

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

a type to check

Helper variable template

template< class T >
constexpr bool is_pod_v = is_pod<T>::value;

(since C++17)

Inherited from std::integral_constant

Member constants

value

[static]

true if T is a POD type , 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>`

Notes

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

Example

#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

is_standard_layout (C++11)	checks if a type is standard-layout type (class template)
is_trivial (C++11)	checks if a type is trivial (class template)
std::experimental::is_pod_v (library fundamentals TS)	variable template alias of `std::is_pod::value` (variable template)