[RFC] Large file iostreams

[Benjamin Kosnik]

>The standard requires in several places that streamoff must be a
>typedef, so it is defined as
>  typedef class __streamoff streamoff;

Bummer, this.

>streamoff and fpos are in a new header bits/postypes.h; it seems
>more descriptive than fpos.h since streamoff is also a class type.

Yeah. Here are the mods to make it build cleanly and pass the testsuite....

I'm a bit worried about

off_type = pos_type 

no longer working. However,

off_type = off_type(pos_type)

seems conformant, as well as

off_type(pos_type)

Anyway.

-benjamin
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