How to express Infinity in C in a ruby extension

Question

I want to do the equivalent of

::Infinity= 1.0/0

in a ruby extension which is written in C.

So far I have come up with

rb_const_set(rb_mKernel, rb_intern("Infinity"), rb_float_new(1.0/0));

which gives me a compiler warning due to division by zero. And

rb_const_set(rb_mKernel, rb_intern("Infinity"), rb_eval_string("1.0/0"));

which is ugly due to the usage of eval.

What is a clean proper solution to this?

Is there something you need that [`Float::INFINITY`](http://RubyDoc.Info/stdlib/core/Float) doesn't provide? — Jörg W Mittag, Oct 28 '11 at 22:31
`Float::INFINITY` was added in Ruby 1.9.2, which has been out for over 14 months now. — Jörg W Mittag, Oct 28 '11 at 22:44

score 1 · Accepted Answer · edited May 23 '17 at 12:11

1

I found the answer in this question.

rb_const_set(rb_mKernel, rb_intern("Infinity"), rb_float_new(INFINITY));

There are no compiler warnings for this.

edited May 23 '17 at 12:11

Community

answered Oct 28 '11 at 22:56

johannes

1 Answers1