From cppreference.com
Specifies that the type is POD (Plain Old Data) type. This means the type is compatible with the types used in the C programming language, that is, can be exchanged with C libraries directly, in its binary form.
Note: the standard doesn't define a named requirement with this name. This is a type category defined by the core language. It is included here as a named requirement only for consistency.
This type requirement is deprecated in the C++ standard. All of its uses have been replaced by the more refined type requirements, such as
,
, or
.
(since C++20)Requirements
The following types are collectively called POD types:
arrays of such types
cv-qualified versions of these types
See also