Release 1.45.0

[SVN r66646]
Merges changes from Trunk: refer to history.qbk for the details.
2025-11-04 02:11:45 +01:00 · 2010-11-19 15:17:53 +00:00 · 2010-10-01 11:11:16 +00:00 · 2010-09-17 12:12:03 +00:00 · 2010-09-16 15:40:47 +00:00 · 2010-08-11 18:15:46 +00:00
27 changed files with 1346 additions and 102 deletions
--- a/base_from_member_test.cpp
+++ b/base_from_member_test.cpp
@@ -281,7 +281,7 @@ object_id_compare::operator ()
        }
        else
        {
-            return a.second->before( *b.second );
+            return a.second->before( *b.second ) != 0;
        }
    }
 }
--- a/binary_test.cpp
+++ b/binary_test.cpp
@@ -11,6 +11,10 @@
 #include <algorithm>
 #include <cstddef>

+#ifdef BOOST_MSVC
+#pragma warning(disable:4996) // warning C4996: 'std::equal': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators'
+#endif
+
 /*
 Note: This file tests every single valid bit-grouping on its own, and some
      random combinations of bit-groupings.
--- a/call_traits_test.cpp
+++ b/call_traits_test.cpp
@@ -21,6 +21,10 @@
 #include <libs/type_traits/test/test.hpp>
 #include <libs/type_traits/test/check_type.hpp>

+#ifdef BOOST_MSVC
+#pragma warning(disable:4181) // : warning C4181: qualifier applied to reference type; ignored
+#endif
+
 // a way prevent warnings for unused variables
 template<class T> inline void unused_variable(const T&) {}

@@ -52,7 +56,8 @@ struct contained
   const_reference const_get()const { return v_; }
   // pass value:
   void call(param_type){}
-
+private:
+   contained& operator=(const contained&);
 };

 #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
@@ -77,6 +82,8 @@ struct contained<T[N]>
   reference get() { return v_; }
   const_reference const_get()const { return v_; }
   void call(param_type){}
+private:
+   contained& operator=(const contained&);
 };
 #endif

@@ -197,7 +204,7 @@ struct comparible_UDT
   bool operator == (const comparible_UDT& v){ return v.i_ == i_; }
 };

-int main(int argc, char *argv[ ])
+int main()
 {
   call_traits_checker<comparible_UDT> c1;
   comparible_UDT u;
--- a/doc/Jamfile.v2
+++ b/doc/Jamfile.v2
@@ -0,0 +1,68 @@
+
+# Copyright John Maddock 2005. Use, modification, and distribution are
+# subject to the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+project : requirements
+        # Path for links to Boost:
+        <xsl:param>boost.root=../../../..
+        
+        # Some general style settings:
+        <xsl:param>table.footnote.number.format=1
+        <xsl:param>footnote.number.format=1
+
+        # HTML options first:
+        # Use graphics not text for navigation:
+        <xsl:param>navig.graphics=1
+       # PDF Options:
+        # TOC Generation: this is needed for FOP-0.9 and later:
+        <xsl:param>fop1.extensions=0
+        <xsl:param>xep.extensions=1
+        # TOC generation: this is needed for FOP 0.2, but must not be set to zero for FOP-0.9!
+        <xsl:param>fop.extensions=0
+        # No indent on body text:
+        <xsl:param>body.start.indent=0pt
+        # Margin size:
+        <xsl:param>page.margin.inner=0.5in
+        # Margin size:
+        <xsl:param>page.margin.outer=0.5in
+        # Paper type = A4
+        <xsl:param>paper.type=A4
+        # Yes, we want graphics for admonishments:
+        <xsl:param>admon.graphics=1
+        # Set this one for PDF generation *only*:
+        # default pnd graphics are awful in PDF form,
+        # better use SVG's instead:
+        <format>pdf:<xsl:param>admon.graphics.extension=".svg"
+        <format>pdf:<xsl:param>admon.graphics.path=$(boost-images)/
+        <format>pdf:<xsl:param>boost.url.prefix=http://www.boost.org/doc/libs/release/libs/utility/doc/html
+;
+
+using quickbook ;
+
+path-constant boost-images : ../../../doc/src/images ;
+
+xml declval : declval.qbk ;
+boostbook standalone
+    :
+        declval
+    :
+        # File name of HTML output:
+        <xsl:param>root.filename=declval
+        # How far down we chunk nested sections, basically all of them:
+        <xsl:param>chunk.section.depth=0
+        # Don't put the first section on the same page as the TOC:
+        <xsl:param>chunk.first.sections=0
+        # How far down sections get TOC's
+        <xsl:param>toc.section.depth=1
+        # Max depth in each TOC:
+        <xsl:param>toc.max.depth=1
+        # How far down we go with TOC's
+        <xsl:param>generate.section.toc.level=1
+        
+     ;
+
+
+
+
+
--- a/doc/declval.qbk
+++ b/doc/declval.qbk
@@ -0,0 +1,104 @@
+[/
+ / Copyright (c) 2008 Howard Hinnant
+ / Copyright (c) 2008 Beman Dawes
+ / Copyright (c) 2009-20010 Vicente J. Botet Escriba
+ /
+ / Distributed under the Boost Software License, Version 1.0. (See accompanying
+ / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+ /]
+
+[article Declval
+    [quickbook 1.5]
+    [authors [Hinnant, Howard]]
+    [authors [Dawes, Beman]]
+    [authors [Botet Escriba, Vicente J.]]
+    [copyright 2008 Howard Hinnant]
+    [copyright 2008 Beman Dawes]
+    [copyright 2009-2010 Vicente J. Botet Escriba]
+    [license
+        Distributed under the Boost Software License, Version 1.0.
+        (See accompanying file LICENSE_1_0.txt or copy at
+        [@http://www.boost.org/LICENSE_1_0.txt])
+    ]
+]
+
+[/===============]
+[section Overview]
+[/===============]
+
+The motivation for `declval` was introduced in [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2958.html#Value N2958: 
+Moving Swap Forward]. Here follows a rewording of this chapter.
+
+With the provision of decltype, late-specified return types, and default template-arguments for function templates a 
+new generation of SFINAE patterns will emerge to at least partially compensate the lack of concepts on the C++0x timescale. 
+Using this technique, it is sometimes necessary to obtain an object of a known type in a non-using context, e.g. given the declaration 
+
+  template<class T>
+  T&& declval(); // not used
+  
+as part of the function template declaration 
+
+  template<class To, class From>
+  decltype(static_cast<To>(declval<From>())) convert(From&&);
+  
+or as part of a class template definition 
+
+  template<class> class result_of;
+
+  template<class Fn, class... ArgTypes>
+  struct result_of<Fn(ArgTypes...)> 
+  {
+    typedef decltype(declval<Fn>()(declval<ArgTypes>()...)) type;
+  };
+  
+The role of the function template declval() is a transformation of a type T into a value without using or evaluating this function. 
+The name is supposed to direct the reader's attention to the fact that the expression `declval<T>()` is an lvalue if and only if 
+T is an lvalue-reference, otherwise an rvalue. To extend the domain of this function we can do a bit better by changing its declaration to 
+
+  template<class T>
+  typename std::add_rvalue_reference<T>::type declval(); // not used
+  
+which ensures that we can also use cv void as template parameter. The careful reader might have noticed that `declval()` 
+already exists under the name create() as part of the definition of the semantics of the type trait is_convertible in the C==0x standard. 
+
+The provision of a new library component that allows the production of values in unevaluated expressions is considered as 
+important to realize constrained templates in C++0x where concepts are not available. 
+This extremely light-weight function is expected to be part of the daily tool-box of the C++0x programmer. 
+
+[endsect]
+
+
+[/=================]
+[section:reference Reference ]
+[/=================]
+
+`#include <boost/utility/declval.hpp>`
+
+    namespace boost {
+
+        template <typename T>
+        typename add_rvalue_reference<T>::type declval(); //noexcept; // as unevaluated operand
+
+    }  // namespace boost
+
+
+The library provides the function template declval to simplify the definition of expressions which occur as unevaluated operands.
+
+        template <typename T>
+        typename add_rvalue_reference<T>::type declval();
+
+[*Remarks:] If this function is used, the program is ill-formed.
+
+[*Remarks:] The template parameter T of declval may be an incomplete type.
+
+[*Example:]
+
+    template <class To, class From>
+    decltype(static_cast<To>(declval<From>())) convert(From&&);
+
+Declares a function template convert which only participats in overloading if the type From can be explicitly converted to type To. 
+
+[endsect]
+
+
+
--- a/doc/html/declval.html
+++ b/doc/html/declval.html
@@ -0,0 +1,163 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
+<title>Declval</title>
+<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.74.0">
+<link rel="home" href="declval.html" title="Declval">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr>
+<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td>
+<td align="center"><a href="../../../../index.html">Home</a></td>
+<td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td>
+<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
+<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
+<td align="center"><a href="../../../../more/index.htm">More</a></td>
+</tr></table>
+<hr>
+<div class="spirit-nav"></div>
+<div class="article" lang="en">
+<div class="titlepage">
+<div>
+<div><h2 class="title">
+<a name="declval"></a>Declval</h2></div>
+<div><div class="authorgroup">
+<div class="author"><h3 class="author">
+<span class="firstname">Howard</span> <span class="surname">Hinnant</span>
+</h3></div>
+<div class="author"><h3 class="author">
+<span class="firstname">Beman</span> <span class="surname">Dawes</span>
+</h3></div>
+<div class="author"><h3 class="author">
+<span class="firstname">Vicente J.</span> <span class="surname">Botet Escriba</span>
+</h3></div>
+</div></div>
+<div><p class="copyright">Copyright &#169; 2008 Howard Hinnant</p></div>
+<div><p class="copyright">Copyright &#169; 2008 Beman Dawes</p></div>
+<div><p class="copyright">Copyright &#169; 2009 -2010 Vicente J. Botet Escriba</p></div>
+<div><div class="legalnotice">
+<a name="id879409"></a><p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div></div>
+</div>
+<hr>
+</div>
+<div class="toc">
+<p><b>Table of Contents</b></p>
+<dl>
+<dt><span class="section"><a href="declval.html#declval.overview">Overview</a></span></dt>
+<dt><span class="section"><a href="declval.html#declval.reference"> Reference </a></span></dt>
+</dl>
+</div>
+<div class="section" lang="en">
+<div class="titlepage"><div><div><h2 class="title" style="clear: both">
+<a name="declval.overview"></a><a class="link" href="declval.html#declval.overview" title="Overview">Overview</a>
+</h2></div></div></div>
+<p>
+      The motivation for <code class="computeroutput"><span class="identifier">declval</span></code>
+      was introduced in <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2958.html#Value" target="_top">N2958:
+      Moving Swap Forward</a>. Here follows a rewording of this chapter.
+    </p>
+<p>
+      With the provision of decltype, late-specified return types, and default template-arguments
+      for function templates a new generation of SFINAE patterns will emerge to at
+      least partially compensate the lack of concepts on the C++0x timescale. Using
+      this technique, it is sometimes necessary to obtain an object of a known type
+      in a non-using context, e.g. given the declaration
+    </p>
+<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
+<span class="identifier">T</span><span class="special">&amp;&amp;</span> <span class="identifier">declval</span><span class="special">();</span> <span class="comment">// not used
+</span></pre>
+<p>
+      as part of the function template declaration
+    </p>
+<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">To</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">From</span><span class="special">&gt;</span>
+<span class="identifier">decltype</span><span class="special">(</span><span class="keyword">static_cast</span><span class="special">&lt;</span><span class="identifier">To</span><span class="special">&gt;(</span><span class="identifier">declval</span><span class="special">&lt;</span><span class="identifier">From</span><span class="special">&gt;()))</span> <span class="identifier">convert</span><span class="special">(</span><span class="identifier">From</span><span class="special">&amp;&amp;);</span>
+</pre>
+<p>
+      or as part of a class template definition
+    </p>
+<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span><span class="special">&gt;</span> <span class="keyword">class</span> <span class="identifier">result_of</span><span class="special">;</span>
+
+<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Fn</span><span class="special">,</span> <span class="keyword">class</span><span class="special">...</span> <span class="identifier">ArgTypes</span><span class="special">&gt;</span>
+<span class="keyword">struct</span> <span class="identifier">result_of</span><span class="special">&lt;</span><span class="identifier">Fn</span><span class="special">(</span><span class="identifier">ArgTypes</span><span class="special">...)&gt;</span> 
+<span class="special">{</span>
+  <span class="keyword">typedef</span> <span class="identifier">decltype</span><span class="special">(</span><span class="identifier">declval</span><span class="special">&lt;</span><span class="identifier">Fn</span><span class="special">&gt;()(</span><span class="identifier">declval</span><span class="special">&lt;</span><span class="identifier">ArgTypes</span><span class="special">&gt;()...))</span> <span class="identifier">type</span><span class="special">;</span>
+<span class="special">};</span>
+</pre>
+<p>
+      The role of the function template declval() is a transformation of a type T
+      into a value without using or evaluating this function. The name is supposed
+      to direct the reader's attention to the fact that the expression <code class="computeroutput"><span class="identifier">declval</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;()</span></code> is
+      an lvalue if and only if T is an lvalue-reference, otherwise an rvalue. To
+      extend the domain of this function we can do a bit better by changing its declaration
+      to
+    </p>
+<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
+<span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">add_rvalue_reference</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">declval</span><span class="special">();</span> <span class="comment">// not used
+</span></pre>
+<p>
+      which ensures that we can also use cv void as template parameter. The careful
+      reader might have noticed that <code class="computeroutput"><span class="identifier">declval</span><span class="special">()</span></code> already exists under the name create() as
+      part of the definition of the semantics of the type trait is_convertible in
+      the C==0x standard.
+    </p>
+<p>
+      The provision of a new library component that allows the production of values
+      in unevaluated expressions is considered as important to realize constrained
+      templates in C++0x where concepts are not available. This extremely light-weight
+      function is expected to be part of the daily tool-box of the C++0x programmer.
+    </p>
+</div>
+<div class="section" lang="en">
+<div class="titlepage"><div><div><h2 class="title" style="clear: both">
+<a name="declval.reference"></a><a class="link" href="declval.html#declval.reference" title="Reference"> Reference </a>
+</h2></div></div></div>
+<p>
+      <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">utility</span><span class="special">/</span><span class="identifier">declval</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
+    </p>
+<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
+
+    <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
+    <span class="keyword">typename</span> <span class="identifier">add_rvalue_reference</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">declval</span><span class="special">();</span> <span class="comment">//noexcept; // as unevaluated operand
+</span>
+<span class="special">}</span>  <span class="comment">// namespace boost
+</span></pre>
+<p>
+      The library provides the function template declval to simplify the definition
+      of expressions which occur as unevaluated operands.
+    </p>
+<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
+<span class="keyword">typename</span> <span class="identifier">add_rvalue_reference</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">declval</span><span class="special">();</span>
+</pre>
+<p>
+      <span class="bold"><strong>Remarks:</strong></span> If this function is used, the program
+      is ill-formed.
+    </p>
+<p>
+      <span class="bold"><strong>Remarks:</strong></span> The template parameter T of declval
+      may be an incomplete type.
+    </p>
+<p>
+      <span class="bold"><strong>Example:</strong></span>
+    </p>
+<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">To</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">From</span><span class="special">&gt;</span>
+<span class="identifier">decltype</span><span class="special">(</span><span class="keyword">static_cast</span><span class="special">&lt;</span><span class="identifier">To</span><span class="special">&gt;(</span><span class="identifier">declval</span><span class="special">&lt;</span><span class="identifier">From</span><span class="special">&gt;()))</span> <span class="identifier">convert</span><span class="special">(</span><span class="identifier">From</span><span class="special">&amp;&amp;);</span>
+</pre>
+<p>
+      Declares a function template convert which only participats in overloading
+      if the type From can be explicitly converted to type To.
+    </p>
+</div>
+</div>
+<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
+<td align="left"><p><small>Last revised: September 16, 2010 at 16:19:10 GMT</small></p></td>
+<td align="right"><div class="copyright-footer"></div></td>
+</tr></table>
+<hr>
+<div class="spirit-nav"></div>
+</body>
+</html>
--- a/include/boost/utility/compare_pointees.hpp
+++ b/include/boost/utility/compare_pointees.hpp
@@ -4,7 +4,7 @@
 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
 //
-// See http://www.boost.org/lib/optional for documentation.
+// See http://www.boost.org/libs/optional for documentation.
 //
 // You are welcome to contact the author at:
 //  fernando_cacciola@hotmail.com
--- a/include/boost/utility/declval.hpp
+++ b/include/boost/utility/declval.hpp
@@ -0,0 +1,44 @@
+//  common_type.hpp  ---------------------------------------------------------//
+
+//  Copyright 2010 Vicente J. Botet Escriba
+
+//  Distributed under the Boost Software License, Version 1.0.
+//  See http://www.boost.org/LICENSE_1_0.txt
+
+#ifndef BOOST_TYPE_TRAITS_EXT_DECLVAL__HPP
+#define BOOST_TYPE_TRAITS_EXT_DECLVAL__HPP
+
+#include <boost/config.hpp>
+
+//----------------------------------------------------------------------------//
+
+#include <boost/type_traits/add_rvalue_reference.hpp>
+
+//----------------------------------------------------------------------------//
+//                                                                            //
+//                           C++03 implementation of                          //
+//                          Written by Vicente J. Botet Escriba               //
+//~ 20.3.4 Function template declval [declval]
+//~ 1 The library provides the function template declval to simplify the definition of expressions which occur as
+//~ unevaluated operands.
+//~ 2 Remarks: If this function is used, the program is ill-formed.
+//~ 3 Remarks: The template parameter T of declval may be an incomplete type.
+//~ [ Example:
+
+//~ template <class To, class From>
+//~ decltype(static_cast<To>(declval<From>())) convert(From&&);
+
+//~ declares a function template convert which only participats in overloading if the type From can be
+//~ explicitly converted to type To. For another example see class template common_type (20.7.6.6). <20>end
+//~ example ]
+//                                                                            //
+//----------------------------------------------------------------------------//
+
+namespace boost {
+
+    template <typename T>
+    typename add_rvalue_reference<T>::type declval(); //noexcept; // as unevaluated operand
+
+}  // namespace boost
+
+#endif  // BOOST_TYPE_TRAITS_EXT_DECLVAL__HPP
--- a/include/boost/utility/detail/in_place_factory_prefix.hpp
+++ b/include/boost/utility/detail/in_place_factory_prefix.hpp
@@ -5,7 +5,7 @@
 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
 //
-// See http://www.boost.org/lib/optional for documentation.
+// See http://www.boost.org/libs/optional for documentation.
 //
 // You are welcome to contact the author at:
 //  fernando_cacciola@hotmail.com
--- a/include/boost/utility/detail/in_place_factory_suffix.hpp
+++ b/include/boost/utility/detail/in_place_factory_suffix.hpp
@@ -5,7 +5,7 @@
 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
 //
-// See http://www.boost.org/lib/optional for documentation.
+// See http://www.boost.org/libs/optional for documentation.
 //
 // You are welcome to contact the author at:
 //  fernando_cacciola@hotmail.com
--- a/include/boost/utility/detail/result_of_iterate.hpp
+++ b/include/boost/utility/detail/result_of_iterate.hpp
@@ -20,10 +20,69 @@
 #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
 template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
         BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of<F(BOOST_RESULT_OF_ARGS)>
-    : boost::detail::result_of_impl<F, F(BOOST_RESULT_OF_ARGS), (boost::detail::has_result_type<F>::value)> {};
+struct tr1_result_of<F(BOOST_RESULT_OF_ARGS)>
+    : mpl::if_<
+          mpl::or_< is_pointer<F>, is_member_function_pointer<F> >
+        , boost::detail::tr1_result_of_impl<
+            typename remove_cv<F>::type, 
+            typename remove_cv<F>::type(BOOST_RESULT_OF_ARGS), 
+            (boost::detail::has_result_type<F>::value)>
+        , boost::detail::tr1_result_of_impl<
+            F,
+            F(BOOST_RESULT_OF_ARGS), 
+            (boost::detail::has_result_type<F>::value)> >::type { };
 #endif

+#if !defined(BOOST_NO_DECLTYPE) && defined(BOOST_RESULT_OF_USE_DECLTYPE)
+
+// As of N2588, C++0x result_of only supports function call
+// expressions of the form f(x). This precludes support for member
+// function pointers, which are invoked with expressions of the form
+// o->*f(x). This implementation supports both.
+template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
+         BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
+struct result_of<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))>
+    : mpl::if_<
+          mpl::or_< is_pointer<F>, is_member_function_pointer<F> >
+        , detail::tr1_result_of_impl<
+            typename remove_cv<F>::type, 
+            typename remove_cv<F>::type(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), false
+          >
+        , detail::cpp0x_result_of_impl<
+              F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))
+          >
+      >::type
+{};
+
+namespace detail {
+
+# define BOOST_RESULT_OF_STATIC_MEMBERS(z, n, _) \
+     static T ## n t ## n; \
+  /**/
+
+template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
+         BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
+class cpp0x_result_of_impl<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))>
+{
+  static F f;
+  BOOST_PP_REPEAT(BOOST_PP_ITERATION(), BOOST_RESULT_OF_STATIC_MEMBERS, _)
+public:
+  typedef decltype(f(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),t))) type;
+};
+
+} // namespace detail 
+
+#else // defined(BOOST_NO_DECLTYPE)
+
+#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
+template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
+         BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
+struct result_of<F(BOOST_RESULT_OF_ARGS)>
+    : tr1_result_of<F(BOOST_RESULT_OF_ARGS)> { };
+#endif
+
+#endif // defined(BOOST_NO_DECLTYPE)
+
 #undef BOOST_RESULT_OF_ARGS

 #if BOOST_PP_ITERATION() >= 1 
@@ -32,14 +91,14 @@ namespace detail {

 template<typename R,  typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
         BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of_impl<R (*)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs, false>
+struct tr1_result_of_impl<R (*)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs, false>
 {
  typedef R type;
 };

 template<typename R,  typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
         BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of_impl<R (&)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs, false>
+struct tr1_result_of_impl<R (&)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs, false>
 {
  typedef R type;
 };
@@ -47,7 +106,7 @@ struct result_of_impl<R (&)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs
 #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
 template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
         BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of_impl<R (T0::*)
+struct tr1_result_of_impl<R (T0::*)
                     (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T)),
                 FArgs, false>
 {
@@ -56,7 +115,7 @@ struct result_of_impl<R (T0::*)

 template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
         BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of_impl<R (T0::*)
+struct tr1_result_of_impl<R (T0::*)
                     (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T))
                     const,
                 FArgs, false>
@@ -66,7 +125,7 @@ struct result_of_impl<R (T0::*)

 template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
         BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of_impl<R (T0::*)
+struct tr1_result_of_impl<R (T0::*)
                     (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T))
                     volatile,
                 FArgs, false>
@@ -76,7 +135,7 @@ struct result_of_impl<R (T0::*)

 template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
         BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of_impl<R (T0::*)
+struct tr1_result_of_impl<R (T0::*)
                     (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T))
                     const volatile,
                 FArgs, false>
--- a/include/boost/utility/in_place_factory.hpp
+++ b/include/boost/utility/in_place_factory.hpp
@@ -5,7 +5,7 @@
 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
 //
-// See http://www.boost.org/lib/optional for documentation.
+// See http://www.boost.org/libs/optional for documentation.
 //
 // You are welcome to contact the author at:
 //  fernando_cacciola@hotmail.com
--- a/include/boost/utility/result_of.hpp
+++ b/include/boost/utility/result_of.hpp
@@ -10,13 +10,18 @@
 #define BOOST_RESULT_OF_HPP

 #include <boost/config.hpp>
-#include <boost/type_traits/ice.hpp>
-#include <boost/type.hpp>
-#include <boost/preprocessor.hpp>
+#include <boost/preprocessor/iteration/iterate.hpp> 
+#include <boost/preprocessor/punctuation/comma_if.hpp> 
+#include <boost/preprocessor/repetition/enum_params.hpp> 
+#include <boost/preprocessor/repetition/enum_shifted_params.hpp> 
 #include <boost/detail/workaround.hpp>
 #include <boost/mpl/has_xxx.hpp>
 #include <boost/mpl/if.hpp>
 #include <boost/mpl/bool.hpp>
+#include <boost/mpl/or.hpp>
+#include <boost/type_traits/is_pointer.hpp>
+#include <boost/type_traits/is_member_function_pointer.hpp>
+#include <boost/type_traits/remove_cv.hpp>

 #ifndef BOOST_RESULT_OF_NUM_ARGS
 #  define BOOST_RESULT_OF_NUM_ARGS 10
@@ -25,13 +30,15 @@
 namespace boost {

 template<typename F> struct result_of;
+template<typename F> struct tr1_result_of; // a TR1-style implementation of result_of

 #if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
 namespace detail {

 BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type)

-template<typename F, typename FArgs, bool HasResultType> struct result_of_impl;
+template<typename F, typename FArgs, bool HasResultType> struct tr1_result_of_impl;
+template<typename F> struct cpp0x_result_of_impl;

 template<typename F>
 struct result_of_void_impl
@@ -51,8 +58,13 @@ struct result_of_void_impl<R (&)(void)>
  typedef R type;
 };

+// Determine the return type of a function pointer or pointer to member.
 template<typename F, typename FArgs>
-struct result_of_impl<F, FArgs, true>
+struct result_of_pointer
+  : tr1_result_of_impl<typename remove_cv<F>::type, FArgs, false> { };
+
+template<typename F, typename FArgs>
+struct tr1_result_of_impl<F, FArgs, true>
 {
  typedef typename F::result_type type;
 };
@@ -68,7 +80,7 @@ struct result_of_nested_result : F::template result<FArgs>
 {};

 template<typename F, typename FArgs>
-struct result_of_impl<F, FArgs, false>
+struct tr1_result_of_impl<F, FArgs, false>
  : mpl::if_<is_function_with_no_args<FArgs>,
             result_of_void_impl<F>,
             result_of_nested_result<F, FArgs> >::type
--- a/include/boost/utility/typed_in_place_factory.hpp
+++ b/include/boost/utility/typed_in_place_factory.hpp
@@ -5,7 +5,7 @@
 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
 //
-// See http://www.boost.org/lib/optional for documentation.
+// See http://www.boost.org/libs/optional for documentation.
 //
 // You are welcome to contact the author at:
 //  fernando_cacciola@hotmail.com
--- a/include/boost/utility/value_init.hpp
+++ b/include/boost/utility/value_init.hpp
@@ -9,6 +9,8 @@
 // 23 May 2008 (Fixed operator= const issue, added initialized_value) Niels Dekker, Fernando Cacciola
 // 21 Ago 2008 (Added swap) Niels Dekker, Fernando Cacciola
 // 20 Feb 2009 (Fixed logical const-ness issues) Niels Dekker, Fernando Cacciola
+// 03 Apr 2010 (Added initialized<T>, suggested by Jeffrey Hellrung, fixing #3472) Niels Dekker
+// 30 May 2010 (Made memset call conditional, fixing #3869) Niels Dekker
 //
 #ifndef BOOST_UTILITY_VALUE_INIT_21AGO2002_HPP
 #define BOOST_UTILITY_VALUE_INIT_21AGO2002_HPP
@@ -20,6 +22,7 @@
 // contains. More details on these issues are at libs/utility/value_init.htm

 #include <boost/aligned_storage.hpp>
+#include <boost/config.hpp> // For BOOST_NO_COMPLETE_VALUE_INITIALIZATION.
 #include <boost/detail/workaround.hpp>
 #include <boost/static_assert.hpp>
 #include <boost/type_traits/cv_traits.hpp>
@@ -28,10 +31,39 @@
 #include <cstring>
 #include <new>

+#ifdef BOOST_MSVC
+#pragma warning(push)
+#if _MSC_VER >= 1310
+// It is safe to ignore the following warning from MSVC 7.1 or higher:
+// "warning C4351: new behavior: elements of array will be default initialized"
+#pragma warning(disable: 4351)
+// It is safe to ignore the following MSVC warning, which may pop up when T is 
+// a const type: "warning C4512: assignment operator could not be generated".
+#pragma warning(disable: 4512)
+#endif
+#endif
+
+#ifdef BOOST_NO_COMPLETE_VALUE_INITIALIZATION
+  // Implementation detail: The macro BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED 
+  // suggests that a workaround should be applied, because of compiler issues 
+  // regarding value-initialization.
+  #define BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED
+#endif
+
+// Implementation detail: The macro BOOST_DETAIL_VALUE_INIT_WORKAROUND
+// switches the value-initialization workaround either on or off.
+#ifndef BOOST_DETAIL_VALUE_INIT_WORKAROUND
+  #ifdef BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED
+  #define BOOST_DETAIL_VALUE_INIT_WORKAROUND 1
+  #else
+  #define BOOST_DETAIL_VALUE_INIT_WORKAROUND 0
+  #endif
+#endif
+
 namespace boost {

 template<class T>
-class value_initialized
+class initialized
 {
  private :
    struct wrapper
@@ -40,6 +72,18 @@ class value_initialized
      typename
 #endif 
      remove_const<T>::type data;
+
+      wrapper()
+      :
+      data()
+      {
+      }
+
+      wrapper(T const & arg)
+      :
+      data(arg)
+      {
+      }
    };

    mutable
@@ -55,30 +99,25 @@ class value_initialized

  public :

-    value_initialized()
+    initialized()
    {
+#if BOOST_DETAIL_VALUE_INIT_WORKAROUND
      std::memset(&x, 0, sizeof(x));
-#ifdef BOOST_MSVC
-#pragma warning(push)
-#if _MSC_VER >= 1310
-// When using MSVC 7.1 or higher, the following placement new expression may trigger warning C4345:
-// "behavior change: an object of POD type constructed with an initializer of the form ()
-// will be default-initialized".  It is safe to ignore this warning when using value_initialized.
-#pragma warning(disable: 4345)
-#endif
 #endif
      new (wrapper_address()) wrapper();
-#ifdef BOOST_MSVC
-#pragma warning(pop)
-#endif
    }

-    value_initialized(value_initialized const & arg)
+    initialized(initialized const & arg)
    {
      new (wrapper_address()) wrapper( static_cast<wrapper const &>(*(arg.wrapper_address())));
    }

-    value_initialized & operator=(value_initialized const & arg)
+    explicit initialized(T const & arg)
+    {
+      new (wrapper_address()) wrapper(arg);
+    }
+
+    initialized & operator=(initialized const & arg)
    {
      // Assignment is only allowed when T is non-const.
      BOOST_STATIC_ASSERT( ! is_const<T>::value );
@@ -86,7 +125,7 @@ class value_initialized
      return *this;
    }

-    ~value_initialized()
+    ~initialized()
    {
      wrapper_address()->wrapper::~wrapper();
    }
@@ -101,17 +140,81 @@ class value_initialized
      return wrapper_address()->data;
    }

-    void swap(value_initialized & arg)
+    void swap(initialized & arg)
    {
      ::boost::swap( this->data(), arg.data() );
    }

-    operator T const &() const { return this->data(); }
+    operator T const &() const
+    {
+      return wrapper_address()->data;
+    }

-    operator T&() { return this->data(); }
+    operator T&()
+    {
+      return wrapper_address()->data;
+    }

 } ;

+template<class T>
+T const& get ( initialized<T> const& x )
+{
+  return x.data() ;
+}
+
+template<class T>
+T& get ( initialized<T>& x )
+{
+  return x.data() ;
+}
+
+template<class T>
+void swap ( initialized<T> & lhs, initialized<T> & rhs )
+{
+  lhs.swap(rhs) ;
+}
+
+template<class T>
+class value_initialized
+{
+  private :
+
+    // initialized<T> does value-initialization by default.
+    initialized<T> m_data;
+
+  public :
+    
+    value_initialized()
+    :
+    m_data()
+    { }
+    
+    T const & data() const
+    {
+      return m_data.data();
+    }
+
+    T& data()
+    {
+      return m_data.data();
+    }
+
+    void swap(value_initialized & arg)
+    {
+      m_data.swap(arg.m_data);
+    }
+
+    operator T const &() const
+    {
+      return m_data;
+    }
+
+    operator T&()
+    {
+      return m_data;
+    }
+} ;


 template<class T>
@@ -119,6 +222,7 @@ T const& get ( value_initialized<T> const& x )
 {
  return x.data() ;
 }
+
 template<class T>
 T& get ( value_initialized<T>& x )
 {
@@ -138,7 +242,7 @@ class initialized_value_t
    
    template <class T> operator T() const
    {
-      return get( value_initialized<T>() );
+      return initialized<T>().data();
    }
 };

@@ -147,5 +251,8 @@ initialized_value_t const initialized_value = {} ;

 } // namespace boost

+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif

 #endif
--- a/index.html
+++ b/index.html
@@ -20,6 +20,7 @@
 				<a href="checked_delete.html">checked_delete</a><br>
 				<a href="compressed_pair.htm">compressed_pair</a><br>
 				<a href="current_function.html">current_function</a><br>
+				<a href="doc/html/declval.html">declval</a><br>
 				<a href="enable_if.html">enable_if</a><br>
            <a href="iterator_adaptors.htm">iterator_adaptors</a><br>
            <a href="generator_iterator.htm">generator iterator adaptors</a><br>
@@ -40,3 +41,4 @@
 			<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->07 November, 2006<!--webbot bot="Timestamp" endspan i-checksum="39368" --></p>
 		</body>
 </html>
+
--- a/initialized_test.cpp
+++ b/initialized_test.cpp
@@ -0,0 +1,116 @@
+// Copyright 2010, Niels Dekker.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// Test program for boost::initialized<T>.
+//
+// 2 May 2010 (Created) Niels Dekker
+
+#include <boost/utility/value_init.hpp>
+#include <boost/detail/lightweight_test.hpp>
+
+#include <string>
+
+namespace
+{
+  // Typical use case for boost::initialized<T>: A generic class that 
+  // holds a value of type T, which must be initialized by either 
+  // value-initialization or direct-initialization.
+  template <class T> class key_value_pair
+  {
+    std::string m_key;
+    boost::initialized<T> m_value;
+  public:
+ 
+    // Value-initializes the object held by m_value.
+    key_value_pair() { }
+
+    // Value-initializes the object held by m_value.
+    explicit key_value_pair(const std::string& key)
+    :
+    m_key(key)
+    {
+    }
+
+    // Direct-initializes the object held by m_value.
+    key_value_pair(const std::string& key, const T& value)
+    :
+    m_key(key), m_value(value)
+    {
+    }
+
+    const T& get_value() const
+    {
+      return m_value;
+    }
+  };
+
+
+  // Tells whether the argument is value-initialized.
+  bool is_value_initialized(const int& arg)
+  {
+    return arg == 0;
+  }
+
+
+  // Tells whether the argument is value-initialized.
+  bool is_value_initialized(const std::string& arg)
+  {
+    return arg.empty();
+  }
+
+  struct foo
+  {
+    int data;
+  };
+
+  bool operator==(const foo& lhs, const foo& rhs)
+  {
+    return lhs.data == rhs.data;
+  }
+
+
+  // Tells whether the argument is value-initialized.
+  bool is_value_initialized(const foo& arg)
+  {
+    return arg.data == 0;
+  }
+
+
+  template <class T>
+  void test_key_value_pair(const T& magic_value)
+  {
+    // The value component of a default key_value_pair must be value-initialized.
+    key_value_pair<T> default_key_value_pair;
+    BOOST_TEST( is_value_initialized(default_key_value_pair.get_value() ) );
+
+    // The value component of a key_value_pair that only has its key explicitly specified
+    // must also be value-initialized.
+    BOOST_TEST( is_value_initialized(key_value_pair<T>("key").get_value()) );
+
+    // However, the value component of the following key_value_pair must be 
+    // "magic_value", as it must be direct-initialized.
+    BOOST_TEST( key_value_pair<T>("key", magic_value).get_value() == magic_value );
+  }
+}
+
+
+// Tests boost::initialize for a fundamental type, a type with a
+// user-defined constructor, and a user-defined type without 
+// a user-defined constructor.
+int main()
+{
+
+  const int magic_number = 42;
+  test_key_value_pair(magic_number);
+
+  const std::string magic_string = "magic value";
+  test_key_value_pair(magic_string);
+
+  const foo magic_foo = { 42 };
+  test_key_value_pair(magic_foo);
+
+  return boost::report_errors();
+}
--- a/initialized_test_fail1.cpp
+++ b/initialized_test_fail1.cpp
@@ -0,0 +1,33 @@
+// Copyright 2010, Niels Dekker.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// Test program for boost::initialized<T>. Must fail to compile.
+//
+// Initial: 2 May 2010
+
+#include <boost/utility/value_init.hpp>
+
+namespace
+{
+  void direct_initialize_from_int()
+  {
+    // Okay: initialized<T> supports direct-initialization from T.
+    boost::initialized<int> direct_initialized_int(1);
+  }
+
+  void copy_initialize_from_int()
+  {
+    // The following line should not compile, because initialized<T> 
+    // was not intended to supports copy-initialization from T.
+    boost::initialized<int> copy_initialized_int = 1;
+  }
+}
+
+int main()
+{
+  // This should fail to compile, so there is no need to call any function.
+  return 0;
+}
--- a/initialized_test_fail2.cpp
+++ b/initialized_test_fail2.cpp
@@ -0,0 +1,37 @@
+// Copyright 2010, Niels Dekker.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// Test program for boost::initialized<T>. Must fail to compile.
+//
+// Initial: 2 May 2010
+
+#include <boost/utility/value_init.hpp>
+
+namespace
+{
+  void from_value_initialized_to_initialized()
+  {
+    boost::value_initialized<int> value_initialized_int;
+
+    // Okay: initialized<T> can be initialized by value_initialized<T>.
+    boost::initialized<int> initialized_int(value_initialized_int);
+  }
+
+  void from_initialized_to_value_initialized()
+  {
+    boost::initialized<int> initialized_int(13);
+
+    // The following line should not compile, because initialized<T>
+    // should not be convertible to value_initialized<T>.
+    boost::value_initialized<int> value_initialized_int(initialized_int);
+  }
+}
+
+int main()
+{
+  // This should fail to compile, so there is no need to call any function.
+  return 0;
+}
--- a/ref_test.cpp
+++ b/ref_test.cpp
@@ -68,11 +68,54 @@ struct ref_wrapper
    }
 };

+struct copy_counter {
+  static int count_;
+  copy_counter(copy_counter const& /*other*/) {
+    ++count_;
+  }
+  copy_counter() {}
+  static void reset() { count_ = 0; }
+  static int count() { return copy_counter::count_;  }
+};
+
+int copy_counter::count_ = 0;
+
 } // namespace unnamed

+template <class T>
+void do_unwrap(T t) {
+
+  /* typename unwrap_reference<T>::type& lt = */
+  unwrap_ref(t);
+
+}
+
+void unwrap_test() {
+
+  int i = 3;
+  const int ci = 2;
+
+  do_unwrap(i);
+  do_unwrap(ci);
+  do_unwrap(ref(i));
+  do_unwrap(cref(ci));
+  do_unwrap(ref(ci));
+
+  copy_counter cc;
+  BOOST_CHECK(cc.count() == 0);
+
+  do_unwrap(cc);
+  do_unwrap(ref(cc));
+  do_unwrap(cref(cc));
+
+  BOOST_CHECK(cc.count() == 1);
+  BOOST_CHECK(unwrap_ref(ref(cc)).count() == 1); 
+}
+
 int test_main(int, char * [])
 {
    ref_wrapper<int>::test(1);
    ref_wrapper<int const>::test(1);
+    unwrap_test();
    return 0;
 }
--- a/swap/test/std_bitset.cpp
+++ b/swap/test/std_bitset.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2008 Joseph Gauterin, Niels Dekker
+// Copyright (c) 2008 - 2010 Joseph Gauterin, Niels Dekker
 //
 // Distributed under the Boost Software License, Version 1.0.
 // (See accompanying file LICENSE_1_0.txt or copy at
@@ -17,8 +17,8 @@
 int test_main(int, char*[])
 {
  typedef std::bitset<8> bitset_type;
-  const bitset_type initial_value1 = 1ul;
-  const bitset_type initial_value2 = 2ul;
+  const bitset_type initial_value1 = 1;
+  const bitset_type initial_value2 = 2;

  bitset_type object1 = initial_value1;
  bitset_type object2 = initial_value2;
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -32,9 +32,13 @@ test-suite utility
        [ compile result_of_test.cpp ]
        [ run ../shared_iterator_test.cpp ]
        [ run ../value_init_test.cpp ]
+        [ run ../value_init_workaround_test.cpp ]
+        [ run ../initialized_test.cpp ]
        [ compile-fail ../value_init_test_fail1.cpp ]
        [ compile-fail ../value_init_test_fail2.cpp ]
        [ compile-fail ../value_init_test_fail3.cpp ]
+        [ compile-fail ../initialized_test_fail1.cpp ]
+        [ compile-fail ../initialized_test_fail2.cpp ]
        [ run ../verify_test.cpp ]
    ;

--- a/test/result_of_test.cpp
+++ b/test/result_of_test.cpp
@@ -5,41 +5,109 @@
 //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
 //  http://www.boost.org/LICENSE_1_0.txt)

+#define BOOST_RESULT_OF_USE_DECLTYPE
+
 // For more information, see http://www.boost.org/libs/utility
 #include <boost/utility/result_of.hpp>
 #include <utility>
 #include <boost/static_assert.hpp>
 #include <boost/type_traits/is_same.hpp>

-struct int_result_type { typedef int result_type; };
+struct int_result_type
+{
+  typedef int result_type;
+  result_type operator()(float);
+};

 struct int_result_of
 {
  template<typename F> struct result { typedef int type; };
+  result<int_result_of(double)>::type operator()(double);
+  result<const int_result_of(double)>::type operator()(double) const;
+  result<int_result_of()>::type operator()();
+  result<volatile int_result_of()>::type operator()() volatile;
 };

-struct int_result_type_and_float_result_of
+struct int_result_type_and_float_result_of_and_char_return
 {
  typedef int result_type;
  template<typename F> struct result { typedef float type; };
+  char operator()(char);
 };

 template<typename T>
-struct int_result_type_template { typedef int result_type; };
+struct int_result_type_template
+{
+  typedef int result_type;
+  result_type operator()(float);
+};

 template<typename T>
 struct int_result_of_template
 {
  template<typename F> struct result;
  template<typename This, typename That> struct result<This(That)> { typedef int type; };
+  typename result<int_result_of_template<T>(double)>::type operator()(double);
+  typename result<const int_result_of_template<T>(double)>::type operator()(double) const;
+  typename result<int_result_of_template<T>(double)>::type operator()();
+  typename result<volatile int_result_of_template<T>(double)>::type operator()() volatile;
 };

 template<typename T>
-struct int_result_type_and_float_result_of_template
+struct int_result_type_and_float_result_of_and_char_return_template
 {
  typedef int result_type;
  template<typename F> struct result;
  template<typename This, typename That> struct result<This(That)> { typedef float type; };
+  char operator()(char);
+};
+
+struct result_of_member_function_template
+{
+  template<typename F> struct result;
+
+  template<typename This, typename That> struct result<This(That)> { typedef That type; };
+  template<class T> typename result<result_of_member_function_template(T)>::type operator()(T);
+
+  template<typename This, typename That> struct result<const This(That)> { typedef const That type; };
+  template<class T> typename result<const result_of_member_function_template(T)>::type operator()(T) const;
+
+  template<typename This, typename That> struct result<volatile This(That)> { typedef volatile That type; };
+  template<class T> typename result<volatile result_of_member_function_template(T)>::type operator()(T) volatile;
+
+  template<typename This, typename That> struct result<const volatile This(That)> { typedef const volatile That type; };
+  template<class T> typename result<const volatile result_of_member_function_template(T)>::type operator()(T) const volatile;
+
+  template<typename This, typename That> struct result<This(That &, That)> { typedef That & type; };
+  template<class T> typename result<result_of_member_function_template(T &, T)>::type operator()(T &, T);
+
+  template<typename This, typename That> struct result<This(That const &, That)> { typedef That const & type; };
+  template<class T> typename result<result_of_member_function_template(T const &, T)>::type operator()(T const &, T);
+
+  template<typename This, typename That> struct result<This(That volatile &, That)> { typedef That volatile & type; };
+  template<class T> typename result<result_of_member_function_template(T volatile &, T)>::type operator()(T volatile &, T);
+
+  template<typename This, typename That> struct result<This(That const volatile &, That)> { typedef That const volatile & type; };
+  template<class T> typename result<result_of_member_function_template(T const volatile &, T)>::type operator()(T const volatile &, T);
+};
+
+struct no_result_type_or_result_of
+{
+  int operator()(double);
+  short operator()(double) const;
+  unsigned int operator()();
+  unsigned short operator()() volatile;
+  const unsigned short operator()() const volatile;
+};
+
+template<typename T>
+struct no_result_type_or_result_of_template
+{
+  int operator()(double);
+  short operator()(double) const;
+  unsigned int operator()();
+  unsigned short operator()() volatile;
+  const unsigned short operator()() const volatile;
 };

 struct X {};
@@ -60,16 +128,52 @@ int main()

  BOOST_STATIC_ASSERT((is_same<result_of<int_result_type(float)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<result_of<int_result_of(double)>::type, int>::value));
-  BOOST_STATIC_ASSERT((is_same<result_of<int_result_of(void)>::type, void>::value));
  BOOST_STATIC_ASSERT((is_same<result_of<const int_result_of(double)>::type, int>::value));
-  BOOST_STATIC_ASSERT((is_same<result_of<volatile int_result_of(void)>::type, void>::value));
-  BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_and_float_result_of(char)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_template<void>(float)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<result_of<int_result_of_template<void>(double)>::type, int>::value));
-  BOOST_STATIC_ASSERT((is_same<result_of<int_result_of_template<void>(void)>::type, void>::value));
  BOOST_STATIC_ASSERT((is_same<result_of<const int_result_of_template<void>(double)>::type, int>::value));
+
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_type(float)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_of(double)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<const int_result_of(double)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_type_template<void>(float)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_of_template<void>(double)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<const int_result_of_template<void>(double)>::type, int>::value));
+
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_of(void)>::type, void>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<volatile int_result_of(void)>::type, void>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_of_template<void>(void)>::type, void>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<volatile int_result_of_template<void>(void)>::type, void>::value));
+
+  // Prior to decltype, result_of could not deduce the return type
+  // nullary function objects unless they exposed a result_type.
+#if !defined(BOOST_NO_DECLTYPE)
+  BOOST_STATIC_ASSERT((is_same<result_of<int_result_of(void)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<volatile int_result_of(void)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<int_result_of_template<void>(void)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<volatile int_result_of_template<void>(void)>::type, int>::value));
+#else
+  BOOST_STATIC_ASSERT((is_same<result_of<int_result_of(void)>::type, void>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<volatile int_result_of(void)>::type, void>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<int_result_of_template<void>(void)>::type, void>::value));
  BOOST_STATIC_ASSERT((is_same<result_of<volatile int_result_of_template<void>(void)>::type, void>::value));
-  BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_and_float_result_of_template<void>(char)>::type, int>::value));
+#endif
+
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_type_and_float_result_of_and_char_return(char)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_type_and_float_result_of_and_char_return_template<void>(char)>::type, int>::value));
+
+  // Prior to decltype, result_of ignored a nested result<> if
+  // result_type was defined. After decltype, result_of deduces the
+  // actual return type of the function object, ignoring both
+  // result<> and result_type.
+#if !defined(BOOST_NO_DECLTYPE)
+  BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_and_float_result_of_and_char_return(char)>::type, char>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_and_float_result_of_and_char_return_template<void>(char)>::type, char>::value));
+#else
+  BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_and_float_result_of_and_char_return(char)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_and_float_result_of_and_char_return_template<void>(char)>::type, int>::value));
+#endif
+
  BOOST_STATIC_ASSERT((is_same<result_of<func_ptr(char, float)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<result_of<func_ref(char, float)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<result_of<func_ptr_0()>::type, int>::value)); 
@@ -81,5 +185,54 @@ int main()
  BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr_0(X)>::type, int>::value)); 
  BOOST_STATIC_ASSERT((is_same<result_of<func_ptr(void)>::type, int>::value));

+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<func_ptr(char, float)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<func_ref(char, float)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<func_ptr_0()>::type, int>::value)); 
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<func_ref_0()>::type, int>::value)); 
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<mem_func_ptr(X,char)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<mem_func_ptr_c(X,char)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<mem_func_ptr_v(X,char)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<mem_func_ptr_cv(X,char)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<mem_func_ptr_0(X)>::type, int>::value)); 
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<func_ptr(void)>::type, int>::value));
+
+  BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(double)>::type, double>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<const result_of_member_function_template(double)>::type, const double>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<volatile result_of_member_function_template(double)>::type, volatile double>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<const volatile result_of_member_function_template(double)>::type, const volatile double>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(int &, int)>::type, int &>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(int const &, int)>::type, int const &>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(int volatile &, int)>::type, int volatile &>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(int const volatile &, int)>::type, int const volatile &>::value));
+
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<result_of_member_function_template(double)>::type, double>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<const result_of_member_function_template(double)>::type, const double>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<volatile result_of_member_function_template(double)>::type, volatile double>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<const volatile result_of_member_function_template(double)>::type, const volatile double>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<result_of_member_function_template(int &, int)>::type, int &>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<result_of_member_function_template(int const &, int)>::type, int const &>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<result_of_member_function_template(int volatile &, int)>::type, int volatile &>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<result_of_member_function_template(int const volatile &, int)>::type, int const volatile &>::value));
+
+  typedef int (*pf_t)(int);
+  BOOST_STATIC_ASSERT((is_same<result_of<pf_t(int)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<pf_t const(int)>::type,int>::value));
+
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<pf_t(int)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<pf_t const(int)>::type,int>::value));
+
+#if !defined(BOOST_NO_DECLTYPE)
+  BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of(double)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of(void)>::type, unsigned int>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<const no_result_type_or_result_of(double)>::type, short>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<volatile no_result_type_or_result_of(void)>::type, unsigned short>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<const volatile no_result_type_or_result_of(void)>::type, const unsigned short>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of_template<void>(double)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of_template<void>(void)>::type, unsigned int>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<const no_result_type_or_result_of_template<void>(double)>::type, short>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<volatile no_result_type_or_result_of_template<void>(void)>::type, unsigned short>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<const volatile no_result_type_or_result_of_template<void>(void)>::type, const unsigned short>::value));
+#endif
+
  return 0;
 }
--- a/utility.htm
+++ b/utility.htm
@@ -151,35 +151,95 @@ void f() {
                <code>result_of&lt;F(T1, T2, ...,
                T<em>N</em>)&gt;::type</code> defines the result type
                of the expression <code>f(t1, t2,
-                ...,t<em>N</em>)</code>. The implementation permits
+                ...,t<em>N</em>)</code>. This implementation permits
                the type <code>F</code> to be a function pointer,
                function reference, member function pointer, or class
-                type. When <code>F</code> is a class type with a
+                type. By default, <em>N</em> may be any value between 0 and
+                10. To change the upper limit, define the macro
+                <code>BOOST_RESULT_OF_NUM_ARGS</code> to the maximum
+                value for <em>N</em>. Class template <code>result_of</code>
+                resides in the header <code>&lt;<a
+                href="../../boost/utility/result_of.hpp">boost/utility/result_of.hpp</a>&gt;</code>.</p>
+
+                <p>If your compiler supports <code>decltype</code>,
+                then you can enable automatic result type deduction by
+                defining the macro <code>BOOST_RESULT_OF_USE_DECLTYPE</code>,
+                as in the following example.</p>
+
+                <blockquote>
+                <pre>#define BOOST_RESULT_OF_USE_DECLTYPE
+#include &lt;boost/utility/result_of.hpp&gt;
+
+struct functor {
+    template&lt;class T&gt;
+    T operator()(T x)
+    {
+        return x;
+    }
+};
+
+typedef boost::result_of&lt;
+    functor(int)
+&gt;::type type;</pre>
+                </blockquote>
+
+                <p>If <code>decltype</code> is not enabled,
+                then automatic result type deduction of function
+                objects is not possible. Instead, <code>result_of</code>
+                uses the following protocol to allow the programmer to
+                specify a type. When <code>F</code> is a class type with a
                member type <code>result_type</code>,
                <code>result_of&lt;F(T1, T2, ...,
                T<em>N</em>)&gt;</code> is
-                <code>F::result_type</code>. Otherwise,
+                <code>F::result_type</code>. When <code>F</code> does
+                not contain <code>result_type</code>,
                <code>result_of&lt;F(T1, T2, ...,
                T<em>N</em>)&gt;</code> is <code>F::result&lt;F(T1,
                T2, ..., T<em>N</em>)&gt;::type</code> when
                <code><em>N</em> &gt; 0</code> or <code>void</code>
-                when <code><em>N</em> = 0</code>. For additional
-                information about <code>result_of</code>, see the
-                C++ Library Technical Report, <a
-                href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf">N1836</a>,
-                or, for motivation and design rationale, the <code>result_of</code> <a
-                href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1454.html">proposal</a>.</p>
+                when <code><em>N</em> = 0</code>. Note that it is the
+                responsibility of the programmer to ensure that
+                function objects accurately advertise their result
+                type via this protocol, as in the following
+                example.</p>

-                <p>Class template <code>result_of</code> resides in
-                the header <code>&lt;<a
-                href="../../boost/utility/result_of.hpp">boost/utility/result_of.hpp</a>&gt;</code>. By
-                default, <em>N</em> may be any value between 0 and
-                10. To change the upper limit, define the macro
-                <code>BOOST_RESULT_OF_NUM_ARGS</code> to the maximum
-                value for <em>N</em>.</p>
+                <blockquote>
+                <pre>struct functor {
+    template&lt;class&gt; struct result;
+
+    template&lt;class F, class T&gt;
+    struct result&lt;F(T)&gt; {
+        typedef T type;
+    };
+
+    template&lt;class T&gt;
+    T operator()(T x)
+    {
+        return x;
+    }
+};
+
+typedef boost::result_of&lt;
+    functor(int)
+&gt;::type type;</pre>
+                </blockquote>

                <a name="BOOST_NO_RESULT_OF"></a>
-                <p>This implementation of <code>result_of</code> requires class template partial specialization, the ability to parse function types properly, and support for SFINAE. If <code>result_of</code> is not supported by your compiler, including the header <code>boost/utility/result_of.hpp</code> will define the macro <code>BOOST_NO_RESULT_OF</code>. Contributed by Doug Gregor.</p>
+                <p>This implementation of <code>result_of</code>
+                requires class template partial specialization, the
+                ability to parse function types properly, and support
+                for SFINAE. If <code>result_of</code> is not supported
+                by your compiler, including the header 
+                <code>boost/utility/result_of.hpp</code> will
+                define the macro <code>BOOST_NO_RESULT_OF</code>.</p>
+
+                <p>For additional information
+                about <code>result_of</code>, see the C++ Library
+                Technical Report,
+                <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf">N1836</a>,
+                or, for motivation and design rationale,
+                the <code>result_of</code> <a href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1454.html">proposal</a>.</p>
+                Contributed by Doug Gregor.</p>

 		<h2>Class templates for the Base-from-Member Idiom</h2>
 		<p>See <a href="base_from_member.html">separate documentation</a>.</p>
--- a/value_init.htm
+++ b/value_init.htm
@@ -33,6 +33,7 @@
                   
 <ul>
          <li><a href="#val_init"><code>template class value_initialized&lt;T&gt;</code></a></li>
+          <li><a href="#initialized"><code>template class initialized&lt;T&gt;</code></a></li>
          <li><a href="#initialized_value"><code>initialized_value</code></a></li>
                   
 </ul>
@@ -123,6 +124,12 @@ constructed by the following declaration:
 </pre>
 </p>
 <p>
+The template <a href="#initialized"><code>initialized</code></a>
+offers both value-initialization and direct-initialization.
+It is especially useful as a data member type, allowing the very same object
+to be either direct-initialized or value-initialized.
+</p>
+<p>
 The <code>const</code> object <a href="#initialized_value"><code>initialized_value</code></a>
 allows value-initializing a variable as follows:
 <pre>
@@ -216,37 +223,65 @@ it <em>may</em> in practice still be left uninitialized, because of those
 compiler issues! It's hard to make a general statement on what those issues
 are like, because they depend on the compiler you are using, its version number,
 and the type of object you would like to have value-initialized.
-Compilers usually support value-initialization for built-in types properly.
-But objects of user-defined types that involve <em>aggregates</em> may <em>in some cases</em>
-be partially, or even entirely left uninitialized, when they should be value-initialized.
+All compilers we have tested so far support value-initialization for arithmetic types properly.
+However, various compilers may leave some types of <em>aggregates</em> uninitialized, when they 
+should be value-initialized. Value-initialization of objects of a pointer-to-member type may also
+go wrong on various compilers. 
 </p>
 <p>
-We have encountered issues regarding value-initialization on compilers by
-Microsoft, Sun, Borland, and GNU. Here is a list of bug reports on those issues:
-<table summary="Compiler bug reports regarding value-initialization" border="0" cellpadding="7" cellspacing="1" >
-<tr><td>
-<a href="https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=100744">
-Microsoft Feedback ID 100744 - Value-initialization in new-expression</a>
-<br>Reported by Pavel Kuznetsov (MetaCommunications Engineering), 2005-07-28
-<br>
-<a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30111">
-GCC Bug 30111 - Value-initialization of POD base class doesn't initialize members</a>
-<br>Reported by Jonathan Wakely, 2006-12-07 
-<br>
-<a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33916">
-GCC Bug 33916 - Default constructor fails to initialize array members</a>
-<br>Reported by Michael Elizabeth Chastain, 2007-10-26
-<br>
-<a href="http://qc.codegear.com/wc/qcmain.aspx?d=51854">
-Borland Report 51854 - Value-initialization: POD struct should be zero-initialized</a>
-<br>Reported by Niels Dekker (LKEB, Leiden University Medical Center), 2007-09-11
-<br>
-</td></tr></table>
+At the moment of writing, May 2010, the following reported issues regarding 
+value-initialization are still there in current compiler releases:
+<ul>
+<li>
+<a href="https://connect.microsoft.com/VisualStudio/feedback/details/100744">
+Microsoft Visual Studio Feedback ID 100744, Value-initialization in new-expression</a>
+<br>Reported by Pavel Kuznetsov (MetaCommunications Engineering), 2005
+</li><li>
+<a href="http://connect.microsoft.com/VisualStudio/feedback/details/484295">
+Microsoft Visual Studio Feedback ID 484295, VC++ does not value-initialize members of derived classes without user-declared constructor</a>
+<br>Reported by Sylvester Hesp, 2009
+</li><li>
+<a href="https://connect.microsoft.com/VisualStudio/feedback/details/499606">
+Microsoft Visual Studio Feedback ID 499606, Presence of copy constructor breaks member class initialization</a>
+<br>Reported by Alex Vakulenko, 2009
+</li><li>
+<a href="http://qc.embarcadero.com/wc/qcmain.aspx?d=83751">
+Embarcadero/C++Builder Report 83751, Value-initialization: arrays should have each element value-initialized</a>
+<br>Reported by Niels Dekker (LKEB), 2010
+</li><li>
+<a href="http://qc.embarcadero.com/wc/qcmain.aspx?d=83851">
+Embarcadero/C++Builder Report 83851, Value-initialized temporary triggers internal backend error C1798</a>
+<br>Reported by Niels Dekker, 2010
+</li><li>
+<a href="http://qc.embarcadero.com/wc/qcmain.aspx?d=84279">
+Embarcadero/C++Builder Report 84279, Internal compiler error (F1004), value-initializing member function pointer by "new T()"</a>
+<br>Reported by Niels Dekker, 2010
+</li><li>
+Sun CR 6947016, Sun 5.10 may fail to value-initialize an object of a non-POD aggregate.
+<br>Reported to Steve Clamage by Niels Dekker, 2010
+</li><li>
+IBM's XL V10.1 and V11.1 may fail to value-initialize a temporary of a non-POD aggregate.
+<br>Reported to Michael Wong by Niels Dekker, 2010
+</li><li>
+Intel support issue 589832, Attempt to value-initialize pointer-to-member triggers internal error
+on Intel 11.1.
+<br>Reported by John Maddock, 2010
+</li>
+</ul>
+Note that all known GCC issues regarding value-initialization are
+fixed with GCC version 4.4, including
+<a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30111">GCC Bug 30111</a>.
+Clang also has completely implemented value-initialization, as far as we know,
+now that <a href="http://llvm.org/bugs/show_bug.cgi?id=7139">Clang Bug 7139</a> is fixed. 
 </p><p>
+
 New versions of <code>value_initialized</code>
 (Boost release version 1.35 or higher)
-offer a workaround to these issues: <code>value_initialized</code> will now clear
-its internal data, prior to constructing the object that it contains.
+offer a workaround to these issues: <code>value_initialized</code> may now clear
+its internal data, prior to constructing the object that it contains. It will do
+so for those compilers that need to have such a workaround, based on the
+<a href="../config/doc/html/boost_config/boost_macro_reference.html#boost_config.boost_macro_reference.macros_that_describe_defects"
+>compiler defect macro</a> BOOST_NO_COMPLETE_VALUE_INITIALIZATION.
 </p>
                   
 <h2><a name="types"></a>Types and objects</h2>
@@ -340,6 +375,52 @@ the wrapped object is always performed with the <code>get()</code> idiom:</p>
                   
 <pre>value_initialized&lt;int&gt; x ;<br>get(x) = 1 ; // OK<br><br>value_initialized&lt;int const&gt; cx ;<br>get(x) = 1 ; // ERROR: Cannot modify a const object<br><br>value_initialized&lt;int&gt; const x_c ;<br>get(x_c) = 1 ; // ERROR: Cannot modify a const object<br><br>value_initialized&lt;int const&gt; const cx_c ;<br>get(cx_c) = 1 ; // ERROR: Cannot modify a const object<br></pre>

+<h2><a name="initialized"><code>template class initialized&lt;T&gt;</code></a></h2>
+                   
+<pre>namespace boost {<br><br>template&lt;class T&gt;<br>class initialized<br>{
+<br>  public :
+<br>    initialized() : x() {}
+<br>    explicit initialized(T const &amp; arg) : x(arg) {}
+<br>    operator T const &amp;() const;
+<br>    operator T&amp;();
+<br>    T const &amp;data() const;
+<br>    T&amp; data();
+<br>    void swap( value_initialized&lt;T&gt;&amp; );
+<br>
+<br>  private :
+<br>    <i>unspecified</i> x ;
+<br>} ;
+<br>
+<br>template&lt;class T&gt;
+<br>T const&amp; get ( initialized&lt;T&gt; const&amp; x );
+<br>
+<br>template&lt;class T&gt;
+<br>T&amp; get ( initialized&lt;T&gt;&amp; x );
+<br>
+<br>} // namespace boost
+<br></pre>
+
+The template class <code>boost::initialized&lt;T&gt;</code> supports both value-initialization
+and direct-initialization, so its interface is a superset of the interface
+of <code>value_initialized&lt;T&gt;</code>: Its default-constructor 
+value-initializes the wrapped object just like the default-constructor of
+<code>value_initialized&lt;T&gt;</code>, but <code>boost::initialized&lt;T&gt;</code>
+also offers an extra <code>explicit</code>
+constructor, which direct-initializes the wrapped object by the specified value.
+<p>
+
+<code>initialized&lt;T&gt;</code> is especially useful when the wrapped
+object must be either value-initialized or direct-initialized, depending on
+runtime conditions. For example, <code>initialized&lt;T&gt;</code> could
+hold the value of a data member that may be value-initialized by some
+constructors, and direct-initialized by others.
+On the other hand, if it is known beforehand that the
+object must <i>always</i> be value-initialized, <code>value_initialized&lt;T&gt;</code>
+may be preferable. And if the object must always be
+direct-initialized, none of the two wrappers really needs to be used.
+</p>
+ 
+
 <h2><a name="initialized_value"><code>initialized_value</code></a></h2>

 <pre>
@@ -399,6 +480,9 @@ Special thanks to Bj&ouml;rn Karlsson who carefully edited and completed this do
 <p>value_initialized was reimplemented by Fernando Cacciola and Niels Dekker
 for Boost release version 1.35 (2008), offering a workaround to various compiler issues.
     </p>
+<p><code>boost::initialized</code> was very much inspired by feedback from Edward Diener and 
+  Jeffrey Hellrung.
+     </p>
 <p>initialized_value was written by Niels Dekker, and added to Boost release version 1.36 (2008).
     </p>
 <p>Developed by <a href="mailto:fernando_cacciola@hotmail.com">Fernando Cacciola</a>,
@@ -407,9 +491,9 @@ for Boost release version 1.35 (2008), offering a workaround to various compiler
     </p>
                    
 <hr>          
-<p>Revised 03 October 2009</p>
+<p>Revised 30 May 2010</p>
                   
-<p>&copy; Copyright Fernando Cacciola, 2002, 2009.</p>
+<p>&copy; Copyright Fernando Cacciola, 2002 - 2010.</p>
                   
 <p>Distributed under the Boost Software License, Version 1.0. See
 <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a></p>
--- a/value_init_test.cpp
+++ b/value_init_test.cpp
@@ -29,9 +29,9 @@
 //
 struct POD
 {
-  POD () : c(0), i(0), f(0) {}
+  POD () : f(0), c(0), i(0){}

-  POD ( char c_, int i_, float f_ ) : c(c_), i(i_), f(f_) {}
+  POD ( char c_, int i_, float f_ ) : f(f_), c(c_), i(i_) {}

  friend std::ostream& operator << ( std::ostream& os, POD const& pod )
    { return os << '(' << pod.c << ',' << pod.i << ',' << pod.f << ')' ; }
@@ -291,7 +291,7 @@ int test_main(int, char **)
 {
  BOOST_CHECK ( test( 0,1234 ) ) ;
  BOOST_CHECK ( test( 0.0,12.34 ) ) ;
-  BOOST_CHECK ( test( POD(0,0,0.0), POD('a',1234,56.78) ) ) ;
+  BOOST_CHECK ( test( POD(0,0,0.0), POD('a',1234,56.78f) ) ) ;
  BOOST_CHECK ( test( NonPOD( std::string() ), NonPOD( std::string("something") ) ) ) ;

  NonPOD NonPOD_object( std::string("NonPOD_object") );
--- a/value_init_workaround_test.cpp
+++ b/value_init_workaround_test.cpp
@@ -0,0 +1,144 @@
+// Copyright 2010, Niels Dekker.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// Test program for the boost::value_initialized<T> workaround.
+//
+// 17 June 2010 (Created) Niels Dekker
+
+// Switch the workaround off, before inluding "value_init.hpp".
+#define BOOST_DETAIL_VALUE_INIT_WORKAROUND 0
+#include <boost/utility/value_init.hpp>
+
+#include <iostream>  // For cout.
+#include <cstdlib>  // For EXIT_SUCCESS and EXIT_FAILURE.
+
+namespace
+{
+  struct empty_struct
+  {
+  };
+
+  // A POD aggregate struct derived from an empty struct.
+  // Similar to struct Foo1 from Microsoft Visual C++ bug report 484295,
+  // "VC++ does not value-initialize members of derived classes without 
+  // user-declared constructor", reported in 2009 by Sylvester Hesp:
+  // https://connect.microsoft.com/VisualStudio/feedback/details/484295
+  struct derived_struct: empty_struct
+  {
+    int data;
+  };
+
+  bool is_value_initialized(const derived_struct& arg)
+  {
+    return arg.data == 0;
+  }
+
+
+  class virtual_destructor_holder
+  {
+  public:
+    int i;
+    virtual ~virtual_destructor_holder()
+    {
+    }
+  };
+
+  bool is_value_initialized(const virtual_destructor_holder& arg)
+  {
+    return arg.i == 0;
+  }
+
+  // Equivalent to the Stats class from GCC Bug 33916,
+  // "Default constructor fails to initialize array members", reported in 2007 by
+  // Michael Elizabeth Chastain: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33916
+  // and fixed for GCC 4.2.4.
+  class private_int_array_pair
+  {
+    friend bool is_value_initialized(const private_int_array_pair& arg);
+  private:
+    int first[12];
+    int second[12];
+  };
+
+  bool is_value_initialized(const private_int_array_pair& arg)
+  {
+    for ( unsigned i = 0; i < 12; ++i)
+    {
+      if ( (arg.first[i] != 0) || (arg.second[i] != 0) )
+      {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  template <typename T>
+  bool is_value_initialized(const T(& arg)[2])
+  {
+    return
+      is_value_initialized(arg[0]) &&
+      is_value_initialized(arg[1]);
+  }
+
+  template <typename T>
+  bool is_value_initialized(const boost::value_initialized<T>& arg)
+  {
+    return is_value_initialized(arg.data());
+  }
+
+  // Returns zero when the specified object is value-initializated, and one otherwise.
+  // Prints a message to standard output if the value-initialization has failed.
+  template <class T>
+  unsigned failed_to_value_initialized(const T& object, const char *const object_name)
+  {
+    if ( is_value_initialized(object) )
+    {
+      return 0u;
+    }
+    else
+    {
+      std::cout << "Note: Failed to value-initialize " << object_name << '.' << std::endl;
+      return 1u;
+    }
+  }
+
+// A macro that passed both the name and the value of the specified object to
+// the function above here.
+#define FAILED_TO_VALUE_INITIALIZE(value) failed_to_value_initialized(value, #value)
+
+  // Equivalent to the dirty_stack() function from GCC Bug 33916,
+  // "Default constructor fails to initialize array members", reported in 2007 by
+  // Michael Elizabeth Chastain: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33916
+  void dirty_stack()
+  {
+    unsigned char array_on_stack[4096];
+    for (unsigned i = 0; i < sizeof(array_on_stack); ++i)
+    {
+      array_on_stack[i] = 0x11;
+    }
+  }
+
+}
+
+
+int main()
+{
+  dirty_stack();
+
+  // TODO More types may be added later.
+  const unsigned num_failures =
+    FAILED_TO_VALUE_INITIALIZE(boost::value_initialized<derived_struct>()) +
+    FAILED_TO_VALUE_INITIALIZE(boost::value_initialized<virtual_destructor_holder[2]>()) +
+	FAILED_TO_VALUE_INITIALIZE(boost::value_initialized<private_int_array_pair>());
+
+#ifdef BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED
+  // One or more failures are expected.
+  return num_failures > 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+#else
+  // No failures are expected.
+  return num_failures == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+#endif
+}