Proof-of-Concept Implementation of D0205

[Moritz Klammler]

I have implemented my proposal D0205 to allow seeding random number
engines directly with `std::random_device` as in

    std::random_device device {};
    std::mt19937 engine {device};  // note: device passed by-reference
    std::cout << "Here is a very random number: " << engine() << "\n";

for libstdc++.  The paper will be officially submitted to ISO tomorrow
and hopefully be discussed in Jacksonville and ideally accepted for
C++17.  Attached is my patch against libstdc++ SVN revision 233225 and a
quick note how to use it.  You can find the current version of any of
these as well as the final D0205R1 of the paper on my website, too.

    http://klammler.eu/data/computer-science/iso-c++/p0205/

I would be very grateful for a review of my patch.  This is my first
experience with writing standard library code.  By the way, I don't
know how to make the ABI compatibility check pass again, even though
I've read the [ABI Policy and
Guidelines](https://gcc.gnu.org/onlinedocs/libstdc++/manual/abi.html).

I didn't include a copyright notice in the files because I didn't want
to say that something is by the FSF without being asked to do so.  I
will be happy to fix this once asked for.

Do you have any interest in incorporating this patch into libstdc++?  Is
there a process for merging experimental features that are not
officially standard yet?

Thank you for considering.
-- 
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Public Key:   http://openpgp.klammler.eu
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