From 466e623dd626ca09fdb681a81bec1c565ac5ef30 Mon Sep 17 00:00:00 2001
From: Vinnie Falco <vinnie.falco@gmail.com>
Date: Fri, 18 Oct 2013 15:56:55 -0700
Subject: [PATCH] Add BaseFromMember

---
 .../Builds/VisualStudio2012/beast.vcxproj     |  1 +
 .../VisualStudio2012/beast.vcxproj.filters    |  3 +
 src/beast/beast/Utility.h                     |  1 +
 src/beast/beast/utility/BaseFromMember.h      | 71 +++++++++++++++++++
 4 files changed, 76 insertions(+)
 create mode 100644 src/beast/beast/utility/BaseFromMember.h

diff --git a/src/beast/Builds/VisualStudio2012/beast.vcxproj b/src/beast/Builds/VisualStudio2012/beast.vcxproj
index 934a28286..455746b30 100644
--- a/src/beast/Builds/VisualStudio2012/beast.vcxproj
+++ b/src/beast/Builds/VisualStudio2012/beast.vcxproj
@@ -180,6 +180,7 @@
     <ClInclude Include="..\..\beast\type_traits\RemoveSigned.h" />
     <ClInclude Include="..\..\beast\Uncopyable.h" />
     <ClInclude Include="..\..\beast\Utility.h" />
+    <ClInclude Include="..\..\beast\utility\BaseFromMember.h" />
     <ClInclude Include="..\..\beast\utility\Debug.h" />
     <ClInclude Include="..\..\beast\utility\EnableIf.h" />
     <ClInclude Include="..\..\beast\utility\Error.h" />
diff --git a/src/beast/Builds/VisualStudio2012/beast.vcxproj.filters b/src/beast/Builds/VisualStudio2012/beast.vcxproj.filters
index 171a1a51f..077df7635 100644
--- a/src/beast/Builds/VisualStudio2012/beast.vcxproj.filters
+++ b/src/beast/Builds/VisualStudio2012/beast.vcxproj.filters
@@ -1251,6 +1251,9 @@
     <ClInclude Include="..\..\beast\threads\ScopedWrapperContext.h">
       <Filter>beast\threads</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\beast\utility\BaseFromMember.h">
+      <Filter>beast\utility</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\..\modules\beast_core\containers\AbstractFifo.cpp">
diff --git a/src/beast/beast/Utility.h b/src/beast/beast/Utility.h
index 952d0c225..b7cd0854c 100644
--- a/src/beast/beast/Utility.h
+++ b/src/beast/beast/Utility.h
@@ -20,6 +20,7 @@
 #ifndef BEAST_UTILITY_H_INCLUDED
 #define BEAST_UTILITY_H_INCLUDED
 
+#include "utility/BaseFromMember.h"
 #include "utility/Debug.h"
 #include "utility/EnableIf.h"
 #include "utility/Error.h"
diff --git a/src/beast/beast/utility/BaseFromMember.h b/src/beast/beast/utility/BaseFromMember.h
new file mode 100644
index 000000000..e2103b649
--- /dev/null
+++ b/src/beast/beast/utility/BaseFromMember.h
@@ -0,0 +1,71 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012, 2013 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef BEAST_UTILITY_BASEFROMMEMBER_H_INCLUDED
+#define BEAST_UTILITY_BASEFROMMEMBER_H_INCLUDED
+
+namespace beast {
+
+template <typename T, int UniqueID = 0>
+class BaseFromMember
+{
+private:
+    T m_t;
+
+public:
+    BaseFromMember ()
+        : m_t (T())
+    {
+    }
+
+    template <class P1>
+    explicit BaseFromMember (P1 const& p1)
+        : m_t (p1)
+        { }
+
+    template <class P1, class P2>
+    BaseFromMember (P1 const& p1, P2 const& p2)
+        : m_t (p1, p2)
+        { }
+
+    template <class P1, class P2, class P3>
+    BaseFromMember (P1 const& p1, P2 const& p2, P3 const& p3)
+        : m_t (p1, p2, p3)
+        { }
+
+    template <class P1, class P2, class P3, class P4>
+    BaseFromMember (P1 const& p1, P2 const& p2, P3 const& p3, P4 const& p4)
+        : m_t (p1, p2, p3, p4)
+        { }
+
+    template <class P1, class P2, class P3, class P4, class P5>
+    BaseFromMember (P1 const& p1, P2 const& p2, P3 const& p3, P4 const& p4, P5 const& p5)
+        : m_t (p1, p2, p3, p4, p5)
+        { }
+
+    T& member()
+        { return m_t; }
+
+    T const& member() const
+        { return m_t; }
+};
+
+}
+
+#endif