Forward declarations of oneTBB types over different versions

[xamidi]

I defined some forward declarations in FwdTbb.h, but they keep changing for newer versions of oneTBB (as revealed by several uses of TBB_INTERFACE_VERSION ), e.g. due to renaming of namespaces. For example, in some header file, I can declare

static tbb_concurrent_vector<std::string>& myMethod();

without including <tbb/concurrent_vector.h>, but do that only in the corresponding source file, where I can then define:

tbb::concurrent_vector<string>& MyClass::myMethod() { [...] }

I wonder whether changes of types (or their internal location) between release versions are summarized somewhere, or whether forward declaring oneTBB's structures are somehow discouraged. Maybe I missed documentation or better ways of doing things?