From f8c73201f46b0b8611c72e9e699aca924529676c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eloy=20Dur=C3=A1n?= <eloy.de.enige@gmail.com>
Date: Tue, 15 Apr 2014 12:13:16 +0200
Subject: [PATCH] [Platform] Make instances usable as Hash keys.

Fixes #109.
---
 CHANGELOG.md                   |  4 ++++
 lib/cocoapods-core/platform.rb | 12 ++++++++++++
 spec/platform_spec.rb          | 12 ++++++++++++
 3 files changed, 28 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b939f47ff..54044243b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@
 
 ##### Enhancements
 
+* Make Platform instances usable as Hash keys.
+  [Eloy Durán](https://github.com/alloy)
+  [#109](https://github.com/CocoaPods/Core/pull/109)
+
 * Accept new sources for Pods when they are just redirects of the old one.  
   [Boris Bügling](https://github.com/neonichu)
   [#101](https://github.com/CocoaPods/Core/issues/101)
diff --git a/lib/cocoapods-core/platform.rb b/lib/cocoapods-core/platform.rb
index 9e2e62dcd..df814263e 100644
--- a/lib/cocoapods-core/platform.rb
+++ b/lib/cocoapods-core/platform.rb
@@ -86,6 +86,18 @@ def ==(other)
       end
     end
 
+    # (see #==)
+    alias_method :eql?, :==
+
+    # Hashes the instance by the platform name and deployment target.
+    #
+    # This adds support to make instances usable as Hash keys.
+    #
+    # @!visibility private
+    def hash
+      name.hash ^ deployment_target.hash
+    end
+
     # Checks whether a platform supports another one.
     #
     # In the context of operating system SDKs, a platform supports another
diff --git a/spec/platform_spec.rb b/spec/platform_spec.rb
index b16773d28..c32b2dde9 100644
--- a/spec/platform_spec.rb
+++ b/spec/platform_spec.rb
@@ -83,6 +83,18 @@ module Pod
         Platform.new(:ios, '5.0').requires_legacy_ios_archs?.should.be.false
       end
 
+      it 'is usable as hash keys' do
+        ios   = Platform.new(:ios)
+        osx   = Platform.new(:osx)
+        ios6  = Platform.new(:ios, '6.0')
+        ios61 = Platform.new(:ios, '6.1')
+        hash  = { ios => ios, osx => osx, ios6 => ios6, ios61 => ios61 }
+        hash[Platform.new(:ios)].should.be.eql ios
+        hash[Platform.new(:osx)].should.be.eql osx
+        hash[Platform.new(:ios, '6.0')].should.be.eql ios6
+        hash[Platform.new(:ios, '6.1')].should.be.eql ios61
+      end
+
     end
 
     describe 'Supporting other platforms' do