How can I show C++ code documentation in Xcode 9.3?

Question

I´m developing software based on C++ in Xcode and want to have (at least) the same convenience for code documentation as if I was developing for Swift or objc.

Exam

Answer 1

You cannot. According to Apple's Xcode release notes, as of Xcode 8.3

3rd party docset support is now deprecated and will no longer be supported in a future release of Xcode. (30584489)

There are alternate doc browsers, like Dash which allow you to install your own documentation. But this does not give you what you're hoping for.

I have verified that adding a C++.docset into ~/Library/Developer/Shared/Documentation does not work. (likely a directory left over from an earlier Xcode) In fact, removing this directory entirely does not affect Xcode 9.x from correctly displaying the default documentation.