[cfe-dev] [libcxx] random_device for Windows needs more storage

[Yaron Keren]

I'm trying to implement random_device for Windows using the CryptGenRandom
API, as in the attached non-working code.

The trouble is, I need to store a crypto handle sized 64 bits in
random_device whereas it has only an int (likely less than 64 bits) private
member for storage.

Is it OK to modify the private member __f_ type from int to uint64_t?

A uint64_t it can hold both the crypto handle on Windows and file handles
on Linux.

Yaron
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