On 12/17/18 8:18 PM, Neia Neutuladh wrote:
On Mon, 17 Dec 2018 22:20:54 +0000, harfel wrote:
I am looking for a way to serialize/deserialize the state of the
std.random.Random number generator, ideally using orange
(https://github.com/jacob-carlborg/orange) or another serialization
library. From looking at the module source code, I understand how to
seed a random number generator with the state of another, but I do find
a way to access the RNG's state, since it is hidden away in a private
attribute. What is the recommended solution for this? Thanks in advance!
The .tupleof field allows you to access private members. This behavior
might eventually change, but probably not without a long deprecation
period.
If the struct stores everything by value:
cast(ubyte[])&rng[0..1];
If you have typeinfo available, you can check if the thing has pointers
with `(typeof(rng).flags & 1) == 0`. There's probably an equivalent in
std.traits that works at compile time.
std.traits.hasIndirections
https://dlang.org/phobos/std_traits.html#hasIndirections
In terms of storing the state, I find generally just using the same seed
is best, but I can see use cases for storing the state for usage
elsewhere. I don't see a better way than using a ubyte[] cast.
-Steve
