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

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.

Example:

std::string myString("hello");
if (myString.empty()) {
    // do something
}

If I want to know exactly what .empty() does, I would like to Option-Click on the function and get the documentation overlay with information from e.g. http://en.cppreference.com/w/cpp/string/basic_string/empty, exactly as it does for objc and Swift.

How is this possible?

Current output just looks like this:

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.

This is for your custom class. You can add your comment like this - in the header I do this

 /**
     * Method name: name
     * Description: returns name
     * Parameters: none
     */

here is a sample I did -

#ifndef test_hpp
#define test_hpp

#include <iostream>
#include <string>

class myclass{
private:
    std::string name_;

public:

    myclass(std::string);
    /**
     * Method name: name
     * Description: returns name
     * Parameters: none
     */
    std::string name();
};

#endif /* test_hpp */