The purpose of the token is to permit different sources of randomness. Seeing
as how you don't allow anything other than `nacl_secure_random_init`, perhaps
you should just make the default token be the empty string in the `<random>`
header.
Checking for an invalid token would just be a simple `!__token.empty()`.
================
Comment at: src/random.cpp:79
@@ +78,3 @@
+ else if (bytes_written != n)
+ __throw_runtime_error("random_device failed obtaining enough bytes");
+ return r;
----------------
This read a little funny to me, maybe:
> random_device failed to obtain enough bytes
http://reviews.llvm.org/D6442
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