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/key.hxx          | 71 +++++++++++++++++++++++++++++++++++++++++
 cutl/container/map-iterator.hxx | 69 +++++++++++++++++++++++++++++++++++++++
 cutl/container/multi-index.hxx  | 15 +++++++++
 3 files changed, 155 insertions(+)
 create mode 100644 cutl/container/key.hxx
 create mode 100644 cutl/container/map-iterator.hxx
 create mode 100644 cutl/container/multi-index.hxx

(limited to 'cutl/container')

diff --git a/cutl/container/key.hxx b/cutl/container/key.hxx
new file mode 100644
index 0000000..6afef96
--- /dev/null
+++ b/cutl/container/key.hxx
@@ -0,0 +1,71 @@
+// file      : cutl/container/key.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : MIT; see accompkeying LICENSE file
+
+#ifndef CUTL_CONTAINER_KEY_HXX
+#define CUTL_CONTAINER_KEY_HXX
+
+namespace cutl
+{
+  namespace container
+  {
+    // A modifiable map key wrapper 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 <class T1, class T2 = void, class T3 = void>
+    struct key;
+
+    template <class T1>
+    struct key<T1, void, void>
+    {
+      mutable const T1* p1;
+
+      key (): p1 (0) {}
+      key (const T1& r1): p1 (&r1) {}
+      void assign (const T1& r1) const {p1 = &r1;}
+
+      bool operator< (const key& x) const {return *p1 < *x.p1;}
+    };
+
+    template <class T1, class T2>
+    struct key<T1, T2, void>
+    {
+      mutable const T1* p1;
+      mutable const T2* p2;
+
+      key (): p1 (0), p2 (0) {}
+      key (const T1& r1, const T2& r2): p1 (&r1), p2 (&r2) {}
+      void assign (const T1& r1, const T2& r2) const {p1 = &r1; p2 = &r2;}
+
+      bool operator< (const key& x) const
+      {
+        return *p1 < *x.p1 || (!(*x.p1 < *p1) && *p2 < *x.p2);
+      }
+    };
+
+    template <class T1, class T2, class T3>
+    struct key
+    {
+      mutable const T1* p1;
+      mutable const T2* p2;
+      mutable const T3* p3;
+
+      key (): p1 (0), p2 (0), p3 (0) {}
+      key (const T1& r1, const T2& r2, const T3& r3)
+          : p1 (&r1), p2 (&r2) , p3 (&r3) {}
+      void assign (const T1& r1, const T2& r2, const T3& r3) const
+      {p1 = &r1; p2 = &r2; p3 = &r3;}
+
+      bool operator< (const key& x) const
+      {
+        return (*p1 < *x.p1 ||
+                (!(*x.p1 < *p1) && (*p2 < *x.p2 ||
+                                    (!(*x.p2 < *p2) && *p3 < *x.p3))));
+      }
+    };
+  }
+}
+
+#endif // CUTL_CONTAINER_KEY_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
diff --git a/cutl/container/multi-index.hxx b/cutl/container/multi-index.hxx
new file mode 100644
index 0000000..d9a713b
--- /dev/null
+++ b/cutl/container/multi-index.hxx
@@ -0,0 +1,15 @@
+// file      : cutl/container/multi-index.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef CUTL_CONTAINER_MULTI_INDEX_HXX
+#define CUTL_CONTAINER_MULTI_INDEX_HXX
+
+// Multi-index containers support. See the following post for details:
+//
+// http://www.codesynthesis.com/~boris/blog/2012/09/11/emulating-boost-multi-index-with-std-containers/
+//
+#include <cutl/container/key.hxx>
+#include <cutl/container/map-iterator.hxx>
+
+#endif // CUTL_CONTAINER_MULTI_INDEX_HXX
-- 
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