Issue

std::is_pod is used in three header files. it is deprecated in c++20, which will generated warnings when we upgrade to use later versions of the standard

Steps to reproduce

change
set(CMAKE_CXX_STANDARD 17)
to
set(CMAKE_CXX_STANDARD 20)
in CMakeLists.txt. Rebuild and watch the warnings

Specifications

I'm using g++ 13.2.0 on debian linux