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std::is_pod

From cppreference.com
< cpp‎ | types
 
 
Metaprogramming library
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Type properties
(C++11)
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is_pod
(C++11)(deprecated in C++20)
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Compile-time rational arithmetic
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Defined in header <type_traits>
template< class T >
struct is_pod;
(since C++11)
(deprecated in C++20)

If T is a POD type ("plain old data type"), provides the member constant value equal to 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.

The behavior of a program that adds specializations for is_pod or is_pod_v (since C++17) is undefined.

Contents

[edit] Template parameters

T - a type to check

[edit] Helper variable template

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

Inherited from std::integral_constant

Member constants

value
[static]
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)
operator()
(C++14)
returns value
(public member function)

Member types

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

[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

checks if a type is a standard-layout type
(class template) [edit]
checks if a type is trivial
(class template) [edit]