std::is_pod

From Cppreference

Jump to: navigation, search

Defined in header `<type_traits>`

template< class T > struct is_pod;		(C++11 feature)

If T is a POD ("plain old data") type (that is, both trivial type and a standard-layout type), provides the member constant value equal true. For any other type, value is false.

Inherited from std::integral_constant

Member constants


`value`	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)

Member types


Type	Definition

`value_type`	`bool`

`type`	std::integral_constant<bool, value>

[edit] Notes

Objects of POD types are fully compatible with the C programming language.

[edit] Example

#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    int m1;
private:
    int m2;
};
 
struct C {
    virtual void foo();
};
 
int main()
{
    std::cout << std::boolalpha;
    std::cout << std::is_pod<A>::value << '\n';
    std::cout << std::is_pod<B>::value << '\n';
    std::cout << std::is_pod<C>::value << '\n';
}

Output:

true
false
false

[edit] See also

is_standard_layout (C++11)

checks if a type is standard-layout type
(class template)

is_trivial (C++11)

checks if a type is trivial
(class template)