[Patch] Simplify basic_streambuf::setg() and setp()?

[Paolo Carlini]

Benjamin Kosnik wrote:

>>The point is: I have checked the standard and a couple of
>>other implementations and cannot find support for the final
>>'if' of our current setg() and setp().
>>    
>>
>Then how does pubsetbuf work? If you test this, you'll find test results
>that fail, as we try to keep the v2 implementation-defined behavior here.
>
Well, of course I tested it, and no testresults failed!

Anyway, I agree that the behaviour of pubsetbuf changes, since setbuf 
calls _M_set_indeterminate
and, inside it, there are __testin and __testout.

Again, I don't think that, according to the standard, setp and setg are 
supposed to change the open mode, but if you tell me that this is for 
consistency with v2... Agreed.

Paolo.