From: ruby-core@...
Date: 2015-06-06T03:06:44+00:00
Subject: [ruby-core:69477] [Ruby trunk - Bug #11228] Classes Cannot be used	in case Statements

Issue #11228 has been updated by Marc-Andre Lafortune.


PS: The definition of `Class#===` allows you to write

   case "A String instance"
   when String
      puts "flaw_demo: This is, where the control flow should be."
   when Regexp
      puts "flaw_demo: Hi Regexp!"
   else
      puts "flaw_demo: The control flow should not reach this line."
   end # case

   # => flaw_demo: This is, where the control flow should be.


----------------------------------------
Bug #11228: Classes Cannot be used in case Statements
https://bugs.ruby-lang.org/issues/11228#change-52778

* Author: Martin Vahi
* Status: Rejected
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
~~~
#!/usr/bin/env ruby

def flaw_demo
   cl_selector="A String instance".class
   case cl_selector
   when String
      puts "flaw_demo: This is, where the control flow should be."
   when Regexp
      puts "flaw_demo: Hi Regexp!"
   else
      puts "flaw_demo: The control flow should not reach this line."
   end # case
end ; flaw_demo()

CONST_1=42
CONST_2=99

def works_ok
   i_selector=42
   case i_selector
   when CONST_1
      puts " works_ok: This is, where the control flow should be."
   when CONST_2
      puts " works_ok: Hi CONST_2!"
   else
      puts " works_ok: The control flow should not reach this line."
   end # case
end ; works_ok()

# Console output:
#     flaw_demo: The control flow should not reach this line.
#      works_ok: This is, where the control flow should be.

~~~

---Files--------------------------------
test_case.rb (798 Bytes)


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