From 791b91420f06a7a023cfb456b056a33695c0d033 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Tue, 3 Mar 2015 00:14:16 +1100
Subject: [PATCH] extent: add indexing operator

---
 extent.cpp | 45 ++++++++++++++++++++++++++++++++++++++++++---
 extent.hpp |  5 +++++
 2 files changed, 47 insertions(+), 3 deletions(-)

diff --git a/extent.cpp b/extent.cpp
index 37ae21ba..810ab828 100644
--- a/extent.cpp
+++ b/extent.cpp
@@ -90,11 +90,11 @@ util::extent<T>::area (void) const
 ///////////////////////////////////////////////////////////////////////////////
 template <typename T>
 util::extent<T>
-util::extent<T>::expanded (util::vector<2,T> size) const
+util::extent<T>::expanded (util::vector<2,T> mag) const
 {
     return {
-        w + size.x,
-        h + size.y
+        w + mag.x,
+        h + mag.y
     };
 }
 
@@ -126,6 +126,45 @@ util::extent<T>::empty (void) const
 }
 
 
+///////////////////////////////////////////////////////////////////////////////
+template <typename T>
+T&
+util::extent<T>::operator[] (size_t idx)
+{
+    switch (idx) {
+    case 0: return w;
+    case 1: return h;
+
+    default:
+        unreachable ();
+    }
+}
+
+
+//-----------------------------------------------------------------------------
+template <typename T>
+const T&
+util::extent<T>::operator[] (size_t idx) const
+{
+    switch (idx) {
+    case 0: return w;
+    case 1: return h;
+
+    default:
+        unreachable ();
+    }
+}
+
+
+//-----------------------------------------------------------------------------
+template <typename T>
+size_t
+util::extent<T>::size (void) const
+{
+    return 2u;
+}
+
+
 ///////////////////////////////////////////////////////////////////////////////
 template <typename T>
 bool
diff --git a/extent.hpp b/extent.hpp
index bc6fe503..244ebd2b 100644
--- a/extent.hpp
+++ b/extent.hpp
@@ -50,6 +50,11 @@ namespace util {
 
         bool empty (void) const;
 
+        T& operator[] (size_t idx);
+        const T& operator[] (size_t idx) const;
+
+        size_t size (void) const;
+
         bool operator ==(const extent& rhs) const;
         bool operator !=(const extent& rhs) const
             { return !(*this == rhs); }