From 73056aeb2b8e67145ee4bf28cd99a6cbb4224231 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sun, 21 Mar 2021 08:30:52 +0900
Subject: complex.c: define `Complex#==` in C.

This change also fixes the error caused by `rational.c` that calls
`mrb_complex_eq()`, which had been undefined.
---
 mrbgems/mruby-complex/mrblib/complex.rb |  8 --------
 mrbgems/mruby-complex/src/complex.c     | 35 +++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/mrbgems/mruby-complex/mrblib/complex.rb b/mrbgems/mruby-complex/mrblib/complex.rb
index 0b5fc8f73..1484ff394 100644
--- a/mrbgems/mruby-complex/mrblib/complex.rb
+++ b/mrbgems/mruby-complex/mrblib/complex.rb
@@ -52,14 +52,6 @@ class Complex < Numeric
   end
   alias_method :quo, :/
 
-  def ==(rhs)
-    if rhs.is_a? Complex
-      real == rhs.real && imaginary == rhs.imaginary
-    elsif rhs.is_a? Numeric
-      imaginary == 0 && real == rhs
-    end
-  end
-
   def abs
     Math.hypot imaginary, real
   end
diff --git a/mrbgems/mruby-complex/src/complex.c b/mrbgems/mruby-complex/src/complex.c
index 8960c0573..67ab9c33d 100644
--- a/mrbgems/mruby-complex/src/complex.c
+++ b/mrbgems/mruby-complex/src/complex.c
@@ -137,6 +137,40 @@ complex_to_c(mrb_state *mrb, mrb_value self)
   return self;
 }
 
+mrb_bool
+mrb_complex_eq(mrb_state *mrb, mrb_value x, mrb_value y)
+{
+  struct mrb_complex *p1 = complex_ptr(mrb, x);
+
+  switch (mrb_type(y)) {
+  case MRB_TT_COMPLEX:
+    {
+      struct mrb_complex *p2 = complex_ptr(mrb, y);
+
+      if (p1->real == p2->real && p1->imaginary == p2->imaginary) {
+        return TRUE;
+      }
+      return FALSE;
+    }
+  case MRB_TT_INTEGER:
+    if (p1->imaginary != 0) return FALSE;
+    return p1->real == mrb_integer(y);
+  case MRB_TT_FLOAT:
+    if (p1->imaginary != 0) return FALSE;
+    return p1->real == mrb_float(y);
+
+  default:
+    return mrb_equal(mrb, y, x);
+  }
+}
+
+static mrb_value
+complex_eq(mrb_state *mrb, mrb_value x)
+{
+  mrb_value y = mrb_get_arg1(mrb);
+  return mrb_bool_value(mrb_complex_eq(mrb, x, y));
+}
+
 /* Arithmetic on (significand, exponent) pairs avoids premature overflow in
    complex division */
 struct float_pair {
@@ -289,6 +323,7 @@ void mrb_mruby_complex_gem_init(mrb_state *mrb)
   mrb_define_method(mrb, comp, "to_i", complex_to_i, MRB_ARGS_NONE());
   mrb_define_method(mrb, comp, "to_c", complex_to_c, MRB_ARGS_NONE());
   mrb_define_method(mrb, comp, "__div__", complex_div, MRB_ARGS_REQ(1));
+  mrb_define_method(mrb, comp, "==", complex_eq, MRB_ARGS_REQ(1));
 #ifndef MRB_USE_RATIONAL
   mrb_define_method(mrb, mrb->integer_class, "/", int_div, MRB_ARGS_REQ(1)); /* overrride */
   mrb_define_method(mrb, mrb->integer_class, "quo", int_quo, MRB_ARGS_REQ(1)); /* overrride */
-- 
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