* numeric.c (num_imaginary): num#i to return imaginary counterpart

  of the given numeric.

* complex.c (Init_Complex): undef #i for complex numbers.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24561 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 24 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 36f8273da7..8308ccdb6a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Mon Aug 17 07:16:10 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* numeric.c (num_imaginary): num#i to return imaginary counterpart
+	  of the given numeric.
+
+	* complex.c (Init_Complex): undef #i for complex numbers.
+
 Mon Aug 17 00:17:33 2009  Tadayoshi Funaba  <tadf@dotrb.org>
 
 	* lib/complex.rb, lib/rational.rb: added warning messages.
diff --git a/complex.c b/complex.c
index ee281ba819..d32ecfd3ca 100644
--- a/complex.c
+++ b/complex.c
@@ -1906,6 +1906,7 @@ Init_Complex(void)
     rb_undef_method(rb_cComplex, "round");
     rb_undef_method(rb_cComplex, "step");
     rb_undef_method(rb_cComplex, "truncate");
+    rb_undef_method(rb_cComplex, "i");
 
 #if 0 /* NUBY */
     rb_undef_method(rb_cComplex, "//");
diff --git a/numeric.c b/numeric.c
index ecaf9c503b..4ba69fd5d9 100644
--- a/numeric.c
+++ b/numeric.c
@@ -238,6 +238,21 @@ num_uplus(VALUE num)
 
 /*
  *  call-seq:
+ *     num.i  ->  Complex(0,num)
+ *
+ *  Returns the corresponding imaginary number.
+ *  Not available for complex numbers.
+ */
+
+static VALUE
+num_imaginary(VALUE num)
+{
+    return rb_complex_new(INT2FIX(0), num);
+}
+
+
+/*
+ *  call-seq:
  *     -num  ->  numeric
  *
  *  Unary Minus---Returns the receiver's value, negated.
@@ -3154,6 +3169,7 @@ Init_Numeric(void)
     rb_define_method(rb_cNumeric, "initialize_copy", num_init_copy, 1);
     rb_define_method(rb_cNumeric, "coerce", num_coerce, 1);
 
+    rb_define_method(rb_cNumeric, "i", num_imaginary, 0);
     rb_define_method(rb_cNumeric, "+@", num_uplus, 0);
     rb_define_method(rb_cNumeric, "-@", num_uminus, 0);
     rb_define_method(rb_cNumeric, "<=>", num_cmp, 1);