std::is_pod (3) - Linux Man Pages

std::is_pod: std::is_pod

NAME

std::is_pod - std::is_pod

Synopsis


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


If T is a PODType ("plain old data type"), that is, both trivial and standard-layout, provides the member constant value equal true. For any other type, value is false.
The behavior is undefined if std::remove_all_extents_t<T> is an incomplete type and not (possibly cv-qualified) void.

Template parameters


T - a type to check


Helper variable template


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


Inherited from std::integral_constant

Member constants


value true if T is a POD type , false otherwise
         (public static member constant)
[static]

Member functions


              converts the object to bool, returns value
operator bool (public member function)


operator() returns value
              (public member function)
(C++14)

Member types


Type Definition
value_type bool
type std::integral_constant<bool, value>

Notes


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

Example


// Run this code


  #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

See also


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


is_trivial checks if a type is trivial
                   (class template)
(C++11)