NAME¶

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 POD type ("plain old data type"), provides the member constant value equal
to 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.

The behavior of a program that adds specializations for is_pod
or is_pod_v
(since C++17) is undefined.

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
[static] (public static member constant)

Member functions¶

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

Member types¶

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

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

See also¶

is_standard_layout checks if a type is a standard-layout type
(C++11) (class template)
is_trivial checks if a type is trivial
(C++11) (class template)