std::is_pod

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Type properties
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is_pod
(C++11)(deprecated in C++20)
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Defined in header <type_traits>
template< class T >
struct is_pod;
(since C++11)
(deprecated in C++20)

std::is_pod is an UnaryTypeTrait.

If T is a POD type ("plain old data type"), the base characteristic is std::true_type. For any other type, the base characteristic is std::false_type.

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

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

Template parameters

T - a type to check

Helper variable template

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

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>

Example

#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
class type with unknown bound
the behavior is
undefined in this case

See also

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