adding 'using std::flush' to backward/iostream.h

[Gabriel Dos Reis]

Phil Edwards <pedwards@disaster.jaj.com> writes:

| On Mon, Feb 26, 2001 at 05:26:40AM +0100, Gabriel Dos Reis wrote:
| > | through the backward headers.  Should they be added to iostream.h or
| > | iomanip.h?  My inclination is the latter.
| > 
| > Agreed.
| 
| Opinions on this patch, for both mainline and branch?

It looks good for me.

Maybe, a comment in the header would be appropriate.

Thanks,

-- Gaby
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