From 2fee22f30dae1d2998f293d0b0ec2b368ceb34d6 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 11 Feb 2014 16:40:41 +0000
Subject: [DOC]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44913 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 bignum.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'bignum.c')

diff --git a/bignum.c b/bignum.c
index daaff252b6..3f1bb38341 100644
--- a/bignum.c
+++ b/bignum.c
@@ -6999,6 +6999,13 @@ rb_big_size(VALUE big)
  *     (2**10000).bit_length     #=> 10001
  *     (2**10000+1).bit_length   #=> 10001
  *
+ *  This method can be used to detect overflow in Array#pack as follows.
+ *
+ *     if n.bit_length < 32
+ *       [n].pack("l") # no overflow
+ *     else
+ *       raise "overflow"
+ *     end
  */
 
 static VALUE
-- 
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