Tests if type is POD.

template <class T>
struct is_pod;

T
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

<type_traits>