From c1059e99d3f74fdd5d9a9792544a9ebc8a10edf7 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@ruby-lang.org>
Date: Fri, 29 Nov 2019 17:11:11 +0900
Subject: [PATCH] Support existence usecase for the custom exception classes

---
 lib/matrix.rb | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/lib/matrix.rb b/lib/matrix.rb
index 8c31643eab..b4d1be33bb 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -16,8 +16,14 @@ require_relative "matrix/version"
 
 module ExceptionForMatrix # :nodoc:
   class ErrDimensionMismatch < StandardError
-    def initialize
-      super("\#{self.name} dimension mismatch")
+    def initialize(val = nil)
+      if val.nil?
+        super
+      elsif val.is_a?(String)
+        super(val)
+      else
+        super("#{val.class.name} dimension mismatch")
+      end
     end
   end
 
@@ -29,7 +35,11 @@ module ExceptionForMatrix # :nodoc:
 
   class ErrOperationNotDefined < StandardError
     def initialize(vals)
-      super("Operation(#{vals[0]}) can\\'t be defined: #{vals[1]} op #{vals[2]}")
+      if vals.is_a?(Array)
+        super("Operation(#{vals[0]}) can\\'t be defined: #{vals[1]} op #{vals[2]}")
+      else
+        super(vals)
+      end
     end
   end