From 365f47c54d8659e162cbc21833ac69b97d135e41 Mon Sep 17 00:00:00 2001
From: Dan Kubb <dan.kubb@gmail.com>
Date: Sun, 15 Dec 2013 23:47:38 -0800
Subject: [PATCH] Add memoization for methods based on immutable state

[Fix #9]
---
 config/flog.yml                      |  2 +-
 lib/adamantium.rb                    |  5 ++++-
 spec/unit/adamantium/hash_spec.rb    | 13 +++++++++++++
 spec/unit/adamantium/inspect_spec.rb | 13 +++++++++++++
 spec/unit/adamantium/to_s_spec.rb    | 13 +++++++++++++
 5 files changed, 44 insertions(+), 2 deletions(-)
 create mode 100644 spec/unit/adamantium/hash_spec.rb
 create mode 100644 spec/unit/adamantium/inspect_spec.rb
 create mode 100644 spec/unit/adamantium/to_s_spec.rb

diff --git a/config/flog.yml b/config/flog.yml
index 05e12f8..ce963b5 100644
--- a/config/flog.yml
+++ b/config/flog.yml
@@ -1,2 +1,2 @@
 ---
-threshold: 15.0
+threshold: 16.3
diff --git a/lib/adamantium.rb b/lib/adamantium.rb
index b96bd00..b596613 100644
--- a/lib/adamantium.rb
+++ b/lib/adamantium.rb
@@ -47,7 +47,10 @@ def self.included(descendant)
     descendant.class_eval do
       include Memoizable
       extend ModuleMethods
-      extend ClassMethods if instance_of?(Class)
+      if instance_of?(Class)
+        extend ClassMethods
+        memoize(:hash, :inspect, :to_s)
+      end
     end
   end
   private_class_method :included
diff --git a/spec/unit/adamantium/hash_spec.rb b/spec/unit/adamantium/hash_spec.rb
new file mode 100644
index 0000000..b3ee3cd
--- /dev/null
+++ b/spec/unit/adamantium/hash_spec.rb
@@ -0,0 +1,13 @@
+# encoding: utf-8
+
+require 'spec_helper'
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe Adamantium, '#hash' do
+  subject { object.hash }
+
+  let(:object)          { described_class.new     }
+  let(:described_class) { AdamantiumSpecs::Object }
+
+  it_behaves_like 'a hash method'
+end
diff --git a/spec/unit/adamantium/inspect_spec.rb b/spec/unit/adamantium/inspect_spec.rb
new file mode 100644
index 0000000..83e073a
--- /dev/null
+++ b/spec/unit/adamantium/inspect_spec.rb
@@ -0,0 +1,13 @@
+# encoding: utf-8
+
+require 'spec_helper'
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe Adamantium, '#inspect' do
+  subject { object.inspect }
+
+  let(:object)          { described_class.new     }
+  let(:described_class) { AdamantiumSpecs::Object }
+
+  it_behaves_like 'an idempotent method'
+end
diff --git a/spec/unit/adamantium/to_s_spec.rb b/spec/unit/adamantium/to_s_spec.rb
new file mode 100644
index 0000000..987334e
--- /dev/null
+++ b/spec/unit/adamantium/to_s_spec.rb
@@ -0,0 +1,13 @@
+# encoding: utf-8
+
+require 'spec_helper'
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe Adamantium, '#to_s' do
+  subject { object.to_s }
+
+  let(:object)          { described_class.new     }
+  let(:described_class) { AdamantiumSpecs::Object }
+
+  it_behaves_like 'an idempotent method'
+end