Defined in header <type_traits> | ||
---|---|---|
template< class T > struct is_pod; | (since C++11) (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
.
T | - | a type to check |
template< class T > inline constexpr bool is_pod_v = is_pod<T>::value; | (since C++17) (deprecated in C++20) |
value
[static] | true if T is a POD type , false otherwise (public static member constant) |
operator bool | converts the object to bool , returns value (public member function) |
operator()
(C++14) | returns value (public member function) |
Type | Definition |
---|---|
value_type | bool |
type | std::integral_constant<bool, value> |
Objects of POD types are fully compatible with the C programming language.
#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
(C++11) | checks if a type is a standard-layout type (class template) |
(C++11) | checks if a type is trivial (class template) |
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