all kinds of symbols are exposed to users of rayx-core

[ichinii]

since many things are defined in header files, users inevitably import symbols, that are not meant to be visible from the outside.

this is a common problem in c++.

other libraries often put 'private' symbols into an extra namespace (e.g. detail)

namespace detail {
void someFunctionThatIsPrivateToRayxCore();
}

void somePublicFunction() {
  detail::someFunctionThatIsPrivateToRayxCore(); // still accessible
}

this method does not inhibit access to 'private' functions. it rather informs the user, that symbols inside namespace detail are not meant to be part of the API

NOTE: this method could help DOXYGEN to separate the API that we expose