There's a good chance that we'll see the emergence of a high quality reusable open source C++ language service component for editors over the next three years or so. Google in particular seems to be putting a lot effort into Clang, LLDB, Kythe and other developer tools. Facebook is also working on a web-based IDE and presumably has interest in good C++ support. Modules in C++17 (which Microsoft intends to adopt quickly) will probably make things easier.