From f80de9f4107a01ab3a917eddf15eaaf4a1c998a2 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 18 Sep 2012 10:28:51 +0200
Subject: Add building blocks for multi-index containers

---
 cutl/container/map-iterator.hxx | 69 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 cutl/container/map-iterator.hxx

(limited to 'cutl/container/map-iterator.hxx')

diff --git a/cutl/container/map-iterator.hxx b/cutl/container/map-iterator.hxx
new file mode 100644
index 0000000..3e84a4f
--- /dev/null
+++ b/cutl/container/map-iterator.hxx
@@ -0,0 +1,69 @@
+// file      : cutl/container/map-iterator.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef CUTL_CONTAINER_MAP_ITERATOR_HXX
+#define CUTL_CONTAINER_MAP_ITERATOR_HXX
+
+namespace cutl
+{
+  namespace container
+  {
+    // Map iterator adapter that can be used to implement multi-index
+    // containers, as discussed in the following post:
+    //
+    // http://www.codesynthesis.com/~boris/blog/2012/09/11/emulating-boost-multi-index-with-std-containers/
+    //
+    template <typename M>
+    struct map_iterator: M::iterator
+    {
+      typedef typename M::iterator base_iterator;
+      typedef typename M::value_type::second_type value_type;
+      typedef value_type* pointer;
+      typedef value_type& reference;
+
+      map_iterator () {}
+      map_iterator (base_iterator i): base_iterator (i) {}
+
+      reference
+      operator* () const
+      {
+        return base_iterator::operator* ().second;
+      }
+
+      pointer
+      operator-> () const
+      {
+        return &base_iterator::operator-> ()->second;
+      }
+    };
+
+    template <typename M>
+    struct map_const_iterator: M::const_iterator
+    {
+      typedef typename M::iterator base_iterator;
+      typedef typename M::const_iterator base_const_iterator;
+      typedef const typename M::value_type::second_type value_type;
+      typedef value_type* pointer;
+      typedef value_type& reference;
+
+      map_const_iterator () {}
+      map_const_iterator (base_iterator i): base_const_iterator (i) {}
+      map_const_iterator (base_const_iterator i): base_const_iterator (i) {}
+
+      reference
+      operator* () const
+      {
+        return base_const_iterator::operator* ().second;
+      }
+
+      pointer
+      operator-> () const
+      {
+        return &base_const_iterator::operator-> ()->second;
+      }
+    };
+  }
+}
+
+#endif // CUTL_CONTAINER_MAP_ITERATOR_HXX
-- 
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