The headers in this directory are meant to support the new C++ bindings (https://fxbug.dev/42138399). The headers would be exposed to users via the same include pattern as those from the high-level C++ bindings at //sdk/lib/fidl/cpp, i.e. #include <lib/fidl/cpp/foobar.h>. The intention is that as the unified C++ bindings becomes the prevalent C++ bindings API, we won‘t have to make another LSC to move the header locations. Therefore, a bit of extra attention is needed to ensure the headers and definitions in this library don’t collide with those in //sdk/lib/fidl/cpp.
Different from //sdk/lib/fidl/cpp, this library has an explicit “include” folder that hosts the headers. This is desirable because we avoid exposing the entire “//src” tree available for inclusion otherwise. Given enough time, we should migrate libraries in //sdk to use a dedicated “include” folder too.