[ruby-core:98354] [Ruby master Feature#16827] C API for writing custom random number generator that can be used as Random objects

Issue #16827 has been updated by Eregon (Benoit Daloze).


IMHO it's not nice to replace a nice Ruby-level API by a C API one.
Is there a benchmark of how much is it slower with `rb_funcallv_public`?

Also, will it still work when passing a custom object understanding `rand`?
If so, there are two ways to dispatch, doesn't seem nice either API-wise.

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Feature #16827: C API for writing custom random number generator that can be used as Random objects
https://bugs.ruby-lang.org/issues/16827#change-85622

* Author: mrkn (Kenta Murata)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
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I want to write custom random number generators (RNGs) that can be used as an alternative to a Random object.
Now custom RNGs with `#rand` method can be used for that purpose, but there is the method call overhead in the current implementation because `#rand` method is called through `rb_funcallv_public`.
I want C API for writing RNGs because all of the random number generator algorithms I want to write are originally written in C.

Nobu already created [a pull-request](https://github.com/ruby/ruby/pull/3024) for such purpose.



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