[input.output] Invalid use of injected-class-name of dependent base

[jwakely]

[ifstream.cons] says "initializing the base class with basic_istream(&sb)" but as that's a dependent base we need to spell its name out in full: basic_istream<char, traits>(&sb).

This occurs in paragraphs 1 and 2, and [ofstream.cons] 1 & 2, and [fstream.cons] 1 & 2.

[jwakely]

Or we could just say "initializing the base class with &sb"

[jensmaurer]

Now that we have class template deduction, basic_istream(&sb) might actually work, deducing the charT and traits template parameters from the parameter.

[jensmaurer]

[istringstream.cons] p1+2 and friends has the same issue, btw.

[jensmaurer]

I would actually opt towards spelling out the name of the base class in full. I find that a bit more readable than just "initializing with &sb".