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)

std::is_pod is a UnaryTypeTrait.

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.

If std::remove_all_extents_t<T> is an incomplete type and not (possibly
cv-qualified) void, the behavior is undefined.

If the program adds specializations for std::is_pod or std::is_pod_v, the behavior
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 <type_traits>

struct A { int m; };
static_assert(std::is_pod_v<A> == true);

class B: public A { int m; };
static_assert(std::is_pod_v<B> == false);

struct C { virtual void foo(); };
static_assert(std::is_pod_v<C> == false);

int main() {}

Defect reports

The following behavior-changing defect reports were applied retroactively to
previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 2015 C++11 T could be an array of incomplete the behavior is
class type with unknown bound undefined in this case

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)
is_scalar checks if a type is a scalar type
(C++11) (class template)

External links¶

Why is std::is_pod deprecated in C++20? — StackOverflow