akr	2013-09-01 10:00:15 +0900 (Sun, 01 Sep 2013)

  New Revision: 42751

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=42751

  Log:
    [DOC]

  Modified files:
    trunk/bignum.c
Index: bignum.c
===================================================================
--- bignum.c	(revision 42750)
+++ bignum.c	(revision 42751)
@@ -6545,6 +6545,8 @@ rb_big_size(VALUE big) https://github.com/ruby/ruby/blob/trunk/bignum.c#L6545
  *  (The bit position of the bit 2**n is n+1.)
  *  If there is no such bit (zero or minus one), zero is returned.
  *
+ *  I.e. This method returns ceil(log2(int < 0 ? -int : int+1)).
+ *
  *     (-2**10000-1).bit_length  #=> 10001
  *     (-2**10000).bit_length    #=> 10000
  *     (-2**10000+1).bit_length  #=> 10000
@@ -6615,6 +6617,8 @@ rb_big_bit_length(VALUE big) https://github.com/ruby/ruby/blob/trunk/bignum.c#L6617
  *  (The bit position of the bit 2**n is n+1.)
  *  If there is no such bit (zero or minus one), zero is returned.
  *
+ *  I.e. This method returns ceil(log2(int < 0 ? -int : int+1)).
+ *
  *     (-2**12-1).bit_length     #=> 13
  *     (-2**12).bit_length       #=> 12
  *     (-2**12+1).bit_length     #=> 12

--
ML: ruby-changes@q...
Info: http://www.atdot.net/~ko1/quickml/