[PATCH] P0935R0 Eradicating unnecessarily explicit default constructors

[Jonathan Wakely]

On 12/06/18 20:10 +0100, Jonathan Wakely wrote:
>Explicit default constructors are problematic, so this change removes
>them from <random> and <ext/random>, as per P0935R0.
>
>	* include/bits/random.h (linear_congruential_engine)
>	(mersenne_twister_engine, subtract_with_carry_engine, random_device)

I forgot to remove the default argument in the no-/dev/urandom version
of std::random_device. Fixed like so.

(Incidentally, it makes me very sad that our std::random_device is
5000 bytes even when it only needs to store a pointer, because we have
a union with mt19937 in it).


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