From: "phluid61 (Matthew Kerwin)" <matthew@...>
Date: 2013-06-24T08:52:26+09:00
Subject: [ruby-core:55616] [ruby-trunk - Feature #8430] Rational number literal


Issue #8430 has been updated by phluid61 (Matthew Kerwin).


headius (Charles Nutter) wrote:
> Not sure if the debate still rages, but something that keeps the numerator and denominator together in a single "literal" seems better to me. Why not add another % literal?
> 
> %R{1,2}
> 
> There's no other literals that are produced via a magic infix operator, and it seems confusing to me.

+1 this seems to introduce the least potential for confusion and backwards-incompatibility.  Question: at what place(s) would a negative sign be allowed? %R{-1,2}, %R{1,-2}, etc.?

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Feature #8430: Rational number literal
https://bugs.ruby-lang.org/issues/8430#change-40105

Author: mrkn (Kenta Murata)
Status: Open
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: current: 2.1.0


I would like to propose a new literal syntax for rational numbers.
The implementation is available in my github repository:
https://github.com/mrkn/ruby/commit/8ca0c9a53593e55d67f509fc403df616e2276e3a

This patch implements a notation that consists of an integer, "//", and another integer, in a row.
The first integer is the numerator, and the second is the denominator.
Whitespaces are permitted between them.

For example:
    1 // 2 == Rational(1, 2)
    1 // 1 == Rational(1, 1)
    0 // 1 == Rational(0, 1)

"0 // 0" occurs syntax error.

I think this new syntax isn't conflict with an empty regexp
because this implementation doesn't treat // as a binary operator.



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