[PATCH] Define std::uniform_random_bit_generator concept for C++20

[Jonathan Wakely]

On 24/10/19 10:34 +0100, Jonathan Wakely wrote:
>	* include/bits/random.h (uniform_random_bit_generator): Define for
>	C++20.
>	* testsuite/26_numerics/random/concept.cc: New test.
>	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error line.
>
>This is the last piece of P0898R3, "C++20 concepts library",

... so this updates the docs.

Tested powerpc64le-linux, committed to trunk.


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