is-pod-class.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: is_pod Class	is_pod Class	11/04/2016	type_traits/std::is_pod	is_pod class is_pod	d73ebdee-746b-4082-9fa4-2db71432eb0e

is_pod Class

Tests if type is POD.

Syntax

template <class T>
struct is_pod;

Parameters

T
The type to query.

Remarks

is_pod<T>::value is true if the type T is Plain Old Data (POD). Otherwise it is false.

Arithmetic types, enumeration types, pointer types, and pointer to member types are POD.

A cv-qualified version of a POD type is itself a POD type.

An array of POD is itself POD.

A struct or union, all of whose non-static data members are POD, is itself POD if it has:

• No user-declared constructors.

• No private or protected non-static data members.

• No base classes.

• No virtual functions.

• No non-static data members of reference type.

• No user-defined copy assignment operator.

• No user-defined destructor.

Therefore, you can recursively build POD structs and arrays that contain POD structs and arrays.

Example

// std__type_traits__is_pod.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>

struct trivial {
    int val;
};

struct throws {
    throws() {}  // User-declared ctor, so not POD

    int val;
};

int main() {
    std::cout << "is_pod<trivial> == " << std::boolalpha
        << std::is_pod<trivial>::value << std::endl;
    std::cout << "is_pod<int> == " << std::boolalpha
        << std::is_pod<int>::value << std::endl;
    std::cout << "is_pod<throws> == " << std::boolalpha
        << std::is_pod<throws>::value << std::endl;

    return (0);
}

is_pod<trivial> == true
is_pod<int> == true
is_pod<throws> == false

Requirements

Header: <type_traits>

Namespace: std

See also

<type_traits>