is_pod Class

Tests if type is POD.


template <class T>
struct is_pod;


The type to query.


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.


// 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


Header: <type_traits>

Namespace: std

See also