Issue #15066 has been updated by nobu (Nobuyoshi Nakada).


Sorry for laziness. 
What about https://github.com/nobu/ruby/pull/new/feature/15066-Complex-API ?


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Feature #15066: Documentation and providing better API for accessing Complex numbers functions in C extensions
https://bugs.ruby-lang.org/issues/15066#change-74748

* Author: v0dro (Sameer Deshmukh)
* Status: Feedback
* Priority: Normal
* Assignee: 
* Target version: 
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Currently there is absolutely no documentation for working with Complex numbers at the level of the C API.

Apart from two macros defined [[here](https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L1079)] for setting the real and imag
values of Complex numbers there is no 'official' way of working with Complex numbers at the level of the C API.

I propose two things:
* Fully document existing Complex number routines.
* Provide a robust and efficient API for dealing with complex numbers from C extensions.



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