std::advance istreambuf_iterator overload

[François Dumont]

Here is the latest version I plan to commit after validation.

I'd like to keep the change to the money_get/get/[char/wchar_t]/9.cc 
tests. At the moment those tests passes only because there is no 
operation on the is iterator (like a check for eof). If we add any, 
internal _M_buf will be reseted and tests will start to fail.

Tested under Linux x86_64 normal and debug modes.

Ok to commit ?

François


On 16/11/2017 21:06, Tim Song wrote:
> On Mon, Nov 13, 2017 at 3:32 PM, Daniel Krügler
> <daniel.kruegler@gmail.com> wrote:
>> but as Jonathan already said, for std::istreambuf_iterator<T> this can
>> never be true (because of the involved IO operations).
>>
> Except, of course, if you advance by zero. It's not a very useful
> case, for sure...
>

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