Why is std::is_pod deprecated in C++20?
c++, standard-layout, trivially-copyable, type-traits
Solution
POD is being replaced with two categories that give more nuances. The c++ standard meeting in november 2017 had this to say about it:
Deprecating the notion of “plain old data” (POD). It has been replaced with two more nuanced categories of types, “trivial” and “standard-layout”. “POD” is equivalent to “trivial and standard layout”, but for many code patterns, a narrower restriction to just “trivial” or just “standard layout” is appropriate; to encourage such precision, the notion of “POD” was therefore deprecated. The library trait is_pod has also been deprecated correspondingly.
For simple data types use the `is_standard_layout` function, for trivial data types (such as simple structs) use the `is_trivial` function.
Problem
`std::is_pod` has been deprecated in C++20. What's the reason for this choice? What should I use in place of `std::is_pod` to know if a type is actually a POD?