* lib/pp.rb: use [""].pack("p").size to detect the pointer size.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27477 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Sat Apr 24 23:40:50 2010  Tanaka Akira  <akr@fsij.org>
+
+	* lib/pp.rb: use [""].pack("p").size to detect the pointer size.
+
 Sat Apr 24 21:07:27 2010  Tanaka Akira  <akr@fsij.org>
 
 	* test/psych/test_psych.rb: don't leave temporary files.

lib/pp.rb

@@ -164,13 +164,7 @@ class PP < PrettyPrint
       group(1, '#<' + obj.class.name, '>', &block)
     end
 
-    if 0x100000000.class == Bignum
-      # 32bit
-      PointerMask = 0xffffffff
-    else
-      # 64bit
-      PointerMask = 0xffffffffffffffff
-    end
+    PointerMask = (1 << ([""].pack("p").size * 8)) - 1
 
     case Object.new.inspect
     when /\A\#<Object:0x([0-9a-f]+)>\z/