Merge branch 'develop'

Assigning a boost::in_place_factory to a boost::optional templated on a
type which was trivially copyable failed to compile under GCC 4.4.7.

.travis.yml

@@ -151,6 +151,7 @@ matrix:
             - llvm-toolchain-precise-3.9
 
     - os: linux
+      dist: trusty
       compiler: clang++-4.0
       env: TOOLSET=clang COMPILER=clang++-4.0 CXXSTD=03,11,14,1z
       addons:
@@ -162,6 +163,7 @@ matrix:
             - llvm-toolchain-trusty-4.0
 
     - os: linux
+      dist: trusty
       compiler: clang++-5.0
       env: TOOLSET=clang COMPILER=clang++-5.0 CXXSTD=03,11,14,1z
       addons:

CMakeLists.txt

@@ -0,0 +1,28 @@
+# Copyright 2019 Mike Dev
+# Distributed under the Boost Software License, Version 1.0.
+# See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
+#
+# NOTE: CMake support for Boost.Optional is currently experimental at best
+#       and the interface is likely to change in the future
+
+cmake_minimum_required( VERSION 3.5 )
+project( BoostOptional )
+
+add_library( boost_optional INTERFACE )
+add_library( Boost::optional ALIAS boost_optional )
+
+target_include_directories( boost_optional INTERFACE include )
+
+target_link_libraries( boost_optional
+    INTERFACE
+        Boost::assert
+        Boost::config
+        Boost::core
+        Boost::detail
+        Boost::move
+        Boost::predef
+        Boost::static_assert
+        Boost::throw_exception
+        Boost::type_traits
+        Boost::utility
+)

doc/27_ref_optional_synopsis.qbk

@@ -196,11 +196,10 @@ They are empty, trivially copyable classes with disabled default constructor.
 
         bool operator!() const noexcept ; ``[link reference_optional_operator_not __GO_TO__]``
 
-        // deprecated methods
-
-        // (deprecated)
         void reset() noexcept ; ``[link reference_optional_reset __GO_TO__]``
 
+        // deprecated methods
+
         // (deprecated)
         void reset ( T const& ) ; ``[link reference_optional_reset_value __GO_TO__]``
 
@@ -275,11 +274,10 @@ They are empty, trivially copyable classes with disabled default constructor.
 
         bool operator!() const noexcept ; ``[link reference_optional_ref_operator_not __GO_TO__]``
 
-        // deprecated methods
-
-        // (deprecated)
         void reset() noexcept ; ``[link reference_optional_ref_reset __GO_TO__]``
 
+        // deprecated methods
+
         // (deprecated)
         template<class R> void reset ( R && r ) noexcept ; ``[link reference_optional_ref_reset_value __GO_TO__]``
 

doc/28_ref_optional_semantics.qbk

@@ -541,7 +541,7 @@ __SPACE__
 [#reference_optional_reset]
 
 [: `void optional<T>::reset() noexcept ;`]
-* [*Deprecated:] Same as `operator=( none_t );`
+* [*Effects:] Same as `operator=( none_t );`
 
 __SPACE__
 
@@ -1129,8 +1129,7 @@ __SPACE__
 
 [#reference_optional_ref_reset]
 [: `void optional<T&>::reset() noexcept;`]
-* [*Effects:] Use `*this = none` instead.
-* [*Remarks:] This function is depprecated.
+* [*Effects:] Same as `*this = none`.
 
 __SPACE__
 

doc/91_relnotes.qbk

@@ -1,7 +1,7 @@
 [/
     Boost.Optional
 
-    Copyright (c) 2015, 2016 Andrzej Krzemienski
+    Copyright (c) 2015 - 2018 Andrzej Krzemienski
 
     Distributed under the Boost Software License, Version 1.0.
     (See accompanying file LICENSE_1_0.txt or copy at
@@ -11,6 +11,19 @@
 
 [section:relnotes Release Notes]
 
+[heading Boost Release 1.73]
+
+* Fixed [@https://github.com/boostorg/optional/issues/78 issue #78].
+* `boost::none` is now declared as an inline variable (on compilers taht support it): there is only one instance of `boost::none` across all translation units. 
+* Fixed a number of compilation errors in GCC 4.4.7 in `optional<T>` for trivial `T`s. Thanks to Robert Leahy for the fix. For details see [@https://github.com/boostorg/optional/pull/80 pr #78].
+* Now surpressing warning `-Wweak-vtables`.  
+
+[heading Boost Release 1.69]
+
+* Remove deprecation mark from `reset()` method (without arguments).
+* Fixed [@https://github.com/boostorg/optional/issues/59 issue #59].
+* Fixed bug with initialization of certain wrapper types in clang with -std=c++03. See [@https://github.com/boostorg/optional/pull/64 pr #64]. 
+
 [heading Boost Release 1.68]
 
 * Added member function `has_value()` for compatibility with `std::optional` ([@https://github.com/boostorg/optional/issues/52 issue #52]).

doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___optional_references.html

@@ -486,14 +486,9 @@
 <a name="reference_optional_ref_reset"></a><div class="blockquote"><blockquote class="blockquote"><p>
             <code class="computeroutput"><span class="keyword">void</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&amp;&gt;::</span><span class="identifier">reset</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">;</span></code>
           </p></blockquote></div>
-<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
-<li class="listitem">
-              <span class="bold"><strong>Effects:</strong></span> Use <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span> <span class="special">=</span> <span class="identifier">none</span></code> instead.
-            </li>
-<li class="listitem">
-              <span class="bold"><strong>Remarks:</strong></span> This function is depprecated.
-            </li>
-</ul></div>
+<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
+              <span class="bold"><strong>Effects:</strong></span> Same as <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span> <span class="special">=</span> <span class="identifier">none</span></code>.
+            </li></ul></div>
 <p>
           <span class="inlinemediaobject"><img src="../../../images/space.png" alt="space"></span>
         </p>

doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___optional_values.html

@@ -1199,8 +1199,8 @@
             <span class="special">;</span></code>
           </p></blockquote></div>
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
-              <span class="bold"><strong>Deprecated:</strong></span> Same as <code class="computeroutput"><span class="keyword">operator</span><span class="special">=(</span>
-              <span class="identifier">none_t</span> <span class="special">);</span></code>
+              <span class="bold"><strong>Effects:</strong></span> Same as <code class="computeroutput"><span class="keyword">operator</span><span class="special">=(</span> <span class="identifier">none_t</span>
+              <span class="special">);</span></code>
             </li></ul></div>
 <p>
           <span class="inlinemediaobject"><img src="../../../images/space.png" alt="space"></span>

doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/header_optional_optional_refs.html

@@ -84,11 +84,10 @@
 
     <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_references.html#reference_optional_ref_operator_not"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
 
-    <span class="comment">// deprecated methods</span>
-
-    <span class="comment">// (deprecated)</span>
     <span class="keyword">void</span> <span class="identifier">reset</span><span class="special">()</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_references.html#reference_optional_ref_reset"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
 
+    <span class="comment">// deprecated methods</span>
+
     <span class="comment">// (deprecated)</span>
     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">R</span><span class="special">&gt;</span> <span class="keyword">void</span> <span class="identifier">reset</span> <span class="special">(</span> <span class="identifier">R</span> <span class="special">&amp;&amp;</span> <span class="identifier">r</span> <span class="special">)</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_references.html#reference_optional_ref_reset_value"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
 

doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/header_optional_optional_values.html

@@ -122,11 +122,10 @@
 
     <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_values.html#reference_optional_operator_not"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
 
-    <span class="comment">// deprecated methods</span>
-
-    <span class="comment">// (deprecated)</span>
     <span class="keyword">void</span> <span class="identifier">reset</span><span class="special">()</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_values.html#reference_optional_reset"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
 
+    <span class="comment">// deprecated methods</span>
+
     <span class="comment">// (deprecated)</span>
     <span class="keyword">void</span> <span class="identifier">reset</span> <span class="special">(</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="special">)</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_values.html#reference_optional_reset_value"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
 

doc/html/boost_optional/relnotes.html

@@ -28,6 +28,47 @@
 </h2></div></div></div>
 <h4>
 <a name="boost_optional.relnotes.h0"></a>
+      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_73"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_73">Boost
+      Release 1.73</a>
+    </h4>
+<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
+<li class="listitem">
+          Fixed <a href="https://github.com/boostorg/optional/issues/78" target="_top">issue
+          #78</a>.
+        </li>
+<li class="listitem">
+          <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code> is now declared as an inline variable
+          (on compilers taht support it): there is only one instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code> across all translation units.
+        </li>
+<li class="listitem">
+          Fixed a number of compilation errors in GCC 4.4.7 in <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code> for trivial <code class="computeroutput"><span class="identifier">T</span></code>s.
+          Thanks to Robert Leahy for the fix. For details see <a href="https://github.com/boostorg/optional/pull/80" target="_top">pr
+          #78</a>.
+        </li>
+<li class="listitem">
+          Now surpressing warning <code class="computeroutput"><span class="special">-</span><span class="identifier">Wweak</span><span class="special">-</span><span class="identifier">vtables</span></code>.
+        </li>
+</ul></div>
+<h4>
+<a name="boost_optional.relnotes.h1"></a>
+      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_69"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_69">Boost
+      Release 1.69</a>
+    </h4>
+<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
+<li class="listitem">
+          Remove deprecation mark from <code class="computeroutput"><span class="identifier">reset</span><span class="special">()</span></code> method (without arguments).
+        </li>
+<li class="listitem">
+          Fixed <a href="https://github.com/boostorg/optional/issues/59" target="_top">issue
+          #59</a>.
+        </li>
+<li class="listitem">
+          Fixed bug with initialization of certain wrapper types in clang with -std=c++03.
+          See <a href="https://github.com/boostorg/optional/pull/64" target="_top">pr #64</a>.
+        </li>
+</ul></div>
+<h4>
+<a name="boost_optional.relnotes.h2"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_68"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_68">Boost
       Release 1.68</a>
     </h4>
@@ -44,7 +85,7 @@
         </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h1"></a>
+<a name="boost_optional.relnotes.h3"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_67"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_67">Boost
       Release 1.67</a>
     </h4>
@@ -58,7 +99,7 @@
         </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h2"></a>
+<a name="boost_optional.relnotes.h4"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_66"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_66">Boost
       Release 1.66</a>
     </h4>
@@ -76,7 +117,7 @@
         </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h3"></a>
+<a name="boost_optional.relnotes.h5"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_63"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_63">Boost
       Release 1.63</a>
     </h4>
@@ -100,7 +141,7 @@
         </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h4"></a>
+<a name="boost_optional.relnotes.h6"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_62"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_62">Boost
       Release 1.62</a>
     </h4>
@@ -108,7 +149,7 @@
           Fixed <a href="https://svn.boost.org/trac/boost/ticket/12179" target="_top">Trac #12179</a>.
         </li></ul></div>
 <h4>
-<a name="boost_optional.relnotes.h5"></a>
+<a name="boost_optional.relnotes.h7"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_61"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_61">Boost
       Release 1.61</a>
     </h4>
@@ -151,7 +192,7 @@
         </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h6"></a>
+<a name="boost_optional.relnotes.h8"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_60"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_60">Boost
       Release 1.60</a>
     </h4>
@@ -162,7 +203,7 @@
           #11203</a>.
         </li></ul></div>
 <h4>
-<a name="boost_optional.relnotes.h7"></a>
+<a name="boost_optional.relnotes.h9"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_59"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_59">Boost
       Release 1.59</a>
     </h4>
@@ -176,7 +217,7 @@
         </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h8"></a>
+<a name="boost_optional.relnotes.h10"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_58"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_58">Boost
       Release 1.58</a>
     </h4>
@@ -212,7 +253,7 @@
         </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h9"></a>
+<a name="boost_optional.relnotes.h11"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_57"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_57">Boost
       Release 1.57</a>
     </h4>
@@ -222,7 +263,7 @@
           to fix C++03 compile error on <code class="computeroutput"><span class="identifier">logic_error</span><span class="special">(</span><span class="string">"..."</span><span class="special">)</span></code>"</em></span>.
         </li></ul></div>
 <h4>
-<a name="boost_optional.relnotes.h10"></a>
+<a name="boost_optional.relnotes.h12"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_56"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_56">Boost
       Release 1.56</a>
     </h4>

doc/html/index.html

@@ -145,7 +145,7 @@
 </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: July 02, 2018 at 21:10:01 GMT</small></p></td>
+<td align="left"><p><small>Last revised: April 08, 2020 at 23:09:18 GMT</small></p></td>
 <td align="right"><div class="copyright-footer"></div></td>
 </tr></table>
 <hr>

include/boost/none.hpp

@@ -13,6 +13,7 @@
 #ifndef BOOST_NONE_17SEP2003_HPP
 #define BOOST_NONE_17SEP2003_HPP
 
+#include "boost/config.hpp"
 #include "boost/none_t.hpp"
 
 // NOTE: Borland users have to include this header outside any precompiled headers
@@ -23,7 +24,7 @@ namespace boost {
 
 #ifdef BOOST_OPTIONAL_USE_OLD_DEFINITION_OF_NONE
 
-none_t const none = (static_cast<none_t>(0)) ;
+BOOST_INLINE_VARIABLE none_t const none = (static_cast<none_t>(0)) ;
 
 #elif defined BOOST_OPTIONAL_USE_SINGLETON_DEFINITION_OF_NONE
 
@@ -35,7 +36,7 @@ namespace detail { namespace optional_detail {
   {
     static const T instance;
   };
-  
+
   template <typename T>
   const T none_instance<T>::instance = T(); // global, but because 'tis a template, no cpp file required
 
@@ -49,7 +50,7 @@ namespace {
 
 #else
 
-const none_t none ((none_t::init_tag()));
+BOOST_INLINE_VARIABLE const none_t none ((none_t::init_tag()));
 
 #endif // older definitions
 

include/boost/optional/bad_optional_access.hpp

@@ -19,6 +19,11 @@
 
 namespace boost {
 
+#if defined(__clang__)
+# pragma clang diagnostic push
+# pragma clang diagnostic ignored "-Wweak-vtables"
+#endif
+
 class bad_optional_access : public std::logic_error
 {
 public:
@@ -27,6 +32,10 @@ public:
     {}
 };
 
+#if defined(__clang__)
+# pragma clang diagnostic pop
+#endif
+
 } // namespace boost
 
 #endif

include/boost/optional/detail/old_optional_implementation.hpp

@@ -332,7 +332,7 @@ class optional_base : public optional_tag
 
   public :
 
-    // **DEPPRECATED** Destroys the current value, if any, leaving this UNINITIALIZED
+    // Destroys the current value, if any, leaving this UNINITIALIZED
     // No-throw (assuming T::~T() doesn't)
     void reset() BOOST_NOEXCEPT { destroy(); }
 

include/boost/optional/detail/optional_trivially_copyable_base.hpp

@@ -30,7 +30,7 @@ class tc_optional_base : public optional_tag
       :
       m_initialized(false) {}
 
-    tc_optional_base ( argument_type val )
+    tc_optional_base ( init_value_tag, argument_type val )
       :
       m_initialized(true), m_storage(val) {}
 
@@ -71,7 +71,7 @@ class tc_optional_base : public optional_tag
     // Assigns from another optional<T> (deep-copies the rhs value)
     void assign ( tc_optional_base const& rhs ) 
     {
-      this->operator=(rhs);
+      *this = rhs;
     }
 
     // Assigns from another _convertible_ optional<U> (deep-copies the rhs value)
@@ -127,7 +127,7 @@ class tc_optional_base : public optional_tag
 
   public :
 
-    // **DEPPRECATED** Destroys the current value, if any, leaving this UNINITIALIZED
+    // Destroys the current value, if any, leaving this UNINITIALIZED
     // No-throw (assuming T::~T() doesn't)
     void reset() BOOST_NOEXCEPT { destroy(); }
 
@@ -359,7 +359,7 @@ class tc_optional_base : public optional_tag
     template<class Expr>
     void construct ( Expr const& factory, in_place_factory_base const* )
      {
-       boost_optional_detail::construct<value_type>(factory, m_storage.address());
+       boost_optional_detail::construct<value_type>(factory, boost::addressof(m_storage));
        m_initialized = true ;
      }
 

include/boost/optional/optional.hpp

@@ -107,7 +107,9 @@ using optional_ns::in_place_init_if;
 
 namespace optional_detail {
 
-struct optional_tag {} ;
+struct init_value_tag {};
+
+struct optional_tag {};
 
 
 template<class T>
@@ -147,7 +149,7 @@ class optional_base : public optional_tag
 
     // Creates an optional<T> initialized with 'val'.
     // Can throw if T::T(T const&) does
-    optional_base ( argument_type val )
+    optional_base ( init_value_tag, argument_type val )
       :
       m_initialized(false)
     {
@@ -157,7 +159,7 @@ class optional_base : public optional_tag
 #ifndef  BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
     // move-construct an optional<T> initialized from an rvalue-ref to 'val'.
     // Can throw if T::T(T&&) does
-    optional_base ( rval_reference_type val )
+    optional_base ( init_value_tag, rval_reference_type val )
       :
       m_initialized(false)
     {
@@ -378,7 +380,7 @@ class optional_base : public optional_tag
 
   public :
 
-    // **DEPPRECATED** Destroys the current value, if any, leaving this UNINITIALIZED
+    // Destroys the current value, if any, leaving this UNINITIALIZED
     // No-throw (assuming T::~T() doesn't)
     void reset() BOOST_NOEXCEPT { destroy(); }
 
@@ -775,7 +777,7 @@ class optional_base : public optional_tag
 
 #include <boost/optional/detail/optional_trivially_copyable_base.hpp>
 
-// definition of metafunciton is_optional_val_init_candidate
+// definition of metafunction is_optional_val_init_candidate
 template <typename U>
 struct is_optional_related
   : boost::conditional< boost::is_base_of<optional_detail::optional_tag, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value
@@ -811,9 +813,14 @@ struct is_optional_constructible : boost::true_type
 
 #endif // is_convertible condition
 
-template <typename T, typename U>
+template <typename T, typename U, bool = is_optional_related<U>::value>
 struct is_optional_val_init_candidate
-  : boost::conditional< !is_optional_related<U>::value && is_convertible_to_T_or_factory<T, U>::value
+  : boost::false_type
+{};
+
+template <typename T, typename U>
+struct is_optional_val_init_candidate<T, U, false>
+  : boost::conditional< is_convertible_to_T_or_factory<T, U>::value
                       , boost::true_type, boost::false_type>::type
 {};
 
@@ -870,12 +877,12 @@ class optional
 
     // Creates an optional<T> initialized with 'val'.
     // Can throw if T::T(T const&) does
-    optional ( argument_type val ) : base(val) {}
+    optional ( argument_type val ) : base(optional_detail::init_value_tag(), val) {}
 
 #ifndef  BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
     // Creates an optional<T> initialized with 'move(val)'.
     // Can throw if T::T(T &&) does
-    optional ( rval_reference_type val ) : base( boost::forward<T>(val) )
+    optional ( rval_reference_type val ) : base(optional_detail::init_value_tag(), boost::forward<T>(val))
       {}
 #endif
 
@@ -965,7 +972,7 @@ class optional
     // Can throw if T::T(T&&) does
 
 #ifndef BOOST_OPTIONAL_DETAIL_NO_DEFAULTED_MOVE_FUNCTIONS
-    optional ( optional && rhs ) = default;
+    optional ( optional && ) = default;
 #else
     optional ( optional && rhs )
       BOOST_NOEXCEPT_IF(::boost::is_nothrow_move_constructible<T>::value)

test/Jamfile.v2

@@ -18,6 +18,7 @@ import testing ;
 {
   test-suite optional :
     [ run optional_test.cpp ]
+    [ run optional_test_assign.cpp ]
     [ run optional_test_swap.cpp ]
     [ run optional_test_conversions_from_U.cpp ]
     [ run optional_test_convert_from_T.cpp ]
@@ -49,6 +50,8 @@ import testing ;
     [ run optional_test_member_T.cpp ]
     [ run optional_test_tc_base.cpp ]
     [ compile optional_test_sfinae_friendly_ctor.cpp ]
+    [ compile optional_test_path_assignment.cpp ]
+    [ compile-fail optional_test_fail_const_swap.cpp ]
     [ compile-fail optional_test_ref_convert_assign_const_int_prevented.cpp ]
     [ compile-fail optional_test_fail1.cpp ]
     [ compile-fail optional_test_fail3a.cpp ]
@@ -74,6 +77,7 @@ import testing ;
     [ run optional_test_static_properties.cpp ]
     [ compile optional_test_maybe_uninitialized_warning.cpp ]
     [ compile optional_test_deleted_default_ctor.cpp ]
+    [ compile optional_test_constructible_from_other.cpp ]
     #[ run optional_xconfig_HACK_TO_LIST_PREDEFINED_MACROS.cpp ]
     [ run optional_xconfig_NO_PROPER_ASSIGN_FROM_CONST_INT_pass.cpp ]
     [ run-fail optional_xconfig_NO_PROPER_ASSIGN_FROM_CONST_INT_fail.cpp ]

test/optional_test_assign.cpp

@@ -0,0 +1,30 @@
+// Copyright (C) 2018 Andrzej Krzemienski.
+//
+// Use, modification, and distribution is 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)
+//
+// See http://www.boost.org/lib/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  akrzemi1@gmail.com
+
+#include "boost/core/lightweight_test.hpp"
+#include "boost/optional/optional.hpp"
+
+void test_assignment_to_empty()
+{
+  // this test used to fail on GCC 8.1.0/8.2.0/9.0.0 with -std=c++98
+  boost::optional<int> oa, ob(1);
+  BOOST_TEST(!oa);
+  BOOST_TEST(ob);
+
+  oa = ob;
+  BOOST_TEST(oa);
+}
+
+int main()
+{
+  test_assignment_to_empty();
+  return boost::report_errors();
+}

test/optional_test_constructible_from_other.cpp

@@ -0,0 +1,59 @@
+// Copyright (c) 2018 Andrey Semashev
+//
+// Use, modification, and distribution is 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)
+
+// The test verifies that Boost.Optional copy constructors do not attempt to invoke
+// the element type initializing constructors from templated arguments
+
+#include <boost/optional/optional.hpp>
+#include <boost/core/enable_if.hpp>
+
+struct no_type
+{
+    char data;
+};
+
+struct yes_type
+{
+    char data[2];
+};
+
+template< unsigned int Size >
+struct size_tag {};
+
+template< typename T, typename U >
+struct is_constructible
+{
+    static U& get();
+
+    template< typename T1 >
+    static yes_type check_helper(size_tag< sizeof(static_cast< T1 >(get())) >*);
+    template< typename T1 >
+    static no_type check_helper(...);
+
+    static const bool value = sizeof(check_helper< T >(0)) == sizeof(yes_type);
+};
+
+template< typename T >
+class wrapper
+{
+public:
+    wrapper() {}
+    wrapper(wrapper const&) {}
+    template< typename U >
+    wrapper(U const&, typename boost::enable_if_c< is_constructible< T, U >::value, int >::type = 0) {}
+};
+
+inline boost::optional< wrapper< int > > foo()
+{
+    return boost::optional< wrapper< int > >();
+}
+
+int main()
+{
+    // Invokes boost::optional copy constructor. Should not invoke wrapper constructor from U.
+    boost::optional< wrapper< int > > res = foo();
+    return 0;
+}

test/optional_test_deleted_default_ctor.cpp

@@ -1,4 +1,6 @@
 // Copyright 2017 Peter Dimov
+// Copyright 2017 Vinnie NotDefaultConstructible
+// Copyright 2018 Andrzej Krzemienski
 //
 // Distributed under the Boost Software License, Version 1.0.
 //
@@ -19,8 +21,8 @@ int main()
 
 class basic_multi_buffer;
 
-class const_buffers_type
-{
+class const_buffers_type // a similar declaration in boost.beast had problem
+{                        // with boost opitonal
     basic_multi_buffer const* b_;
 
     friend class basic_multi_buffer;
@@ -29,16 +31,36 @@ class const_buffers_type
     const_buffers_type(basic_multi_buffer const& b);
 
 public:
-
     const_buffers_type() = delete;
     const_buffers_type(const_buffers_type const&) = default;
     const_buffers_type& operator=(const_buffers_type const&) = default;
 };
 
+void test_beast_example()
+{
+  // test if it even compiles
+  boost::optional< std::pair<const_buffers_type, int> > opt, opt2;
+  opt = opt2;
+  (void)opt;
+}
+
+struct NotDefaultConstructible // minimal class exposing the problem
+{
+  NotDefaultConstructible() = delete;
+};
+
+void test_assign_for_non_default_constructible()
+{
+  // test if it even compiles
+  boost::optional<NotDefaultConstructible> opt, opt2;
+  opt = opt2;
+  (void)opt;
+}
+
 int main()
 {
-    boost::optional< std::pair<const_buffers_type, int> > opt, opt2;
-    opt = opt2;
+  test_beast_example();
+  test_assign_for_non_default_constructible();
 }
 
 #endif

test/optional_test_fail_const_swap.cpp

@@ -0,0 +1,26 @@
+// Copyright (C) 2018, Andrzej Krzemienski.
+//
+// Use, modification, and distribution is 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)
+//
+// See http://www.boost.org/lib/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  akrzemi1@gmail.com
+
+#include "boost/optional.hpp"
+
+// THIS TEST SHOULD FAIL TO COMPILE
+
+void test_converitng_assignment_of_different_enums()
+{
+  const boost::optional<int> o1(1);
+  const boost::optional<int> o2(2);
+  swap(o1, o2); // no swap on const objects should compile
+}
+
+int main()
+{
+  test_converitng_assignment_of_different_enums();
+}

test/optional_test_inplace_factory.cpp

@@ -31,10 +31,10 @@ struct Guard
   std::string str;
   Guard() : num() {}
   Guard(double num_, std::string str_) : num(num_), str(str_) {}
-  
+
   friend bool operator==(const Guard& lhs, const Guard& rhs) { return lhs.num == rhs.num && lhs.str == rhs.str; }
   friend bool operator!=(const Guard& lhs, const Guard& rhs) { return !(lhs == rhs); }
-  
+
 private:
   Guard(const Guard&);
   Guard& operator=(const Guard&);
@@ -44,26 +44,30 @@ void test_ctor()
 {
 #ifndef BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT
   Guard g0, g1(1.0, "one"), g2(2.0, "two");
-  
+
   boost::optional<Guard> og0 ( boost::in_place() );
   boost::optional<Guard> og1 ( boost::in_place(1.0, "one") );
   boost::optional<Guard> og1_( boost::in_place(1.0, "one") );
   boost::optional<Guard> og2 ( boost::in_place<Guard>(2.0, "two") );
-  
+
   BOOST_TEST(og0);
   BOOST_TEST(og1);
   BOOST_TEST(og1_);
   BOOST_TEST(og2);
-  
+
   BOOST_TEST(*og0  == g0);
   BOOST_TEST(*og1  == g1);
   BOOST_TEST(*og1_ == g1);
   BOOST_TEST(*og2  == g2);
-  
+
   BOOST_TEST(og1_ == og1);
   BOOST_TEST(og1_ != og2);
   BOOST_TEST(og1_ != og0);
-#endif 
+
+  boost::optional<unsigned int> o( boost::in_place(5) );
+  BOOST_TEST(o);
+  BOOST_TEST(*o == 5);
+#endif
 }
 
 void test_assign()
@@ -71,27 +75,32 @@ void test_assign()
 #ifndef BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT
 #ifndef BOOST_OPTIONAL_WEAK_OVERLOAD_RESOLUTION
   Guard g0, g1(1.0, "one"), g2(2.0, "two");
-  
+
   boost::optional<Guard> og0, og1, og1_, og2;
-  
+
   og0  = boost::in_place();
   og1  = boost::in_place(1.0, "one");
   og1_ = boost::in_place(1.0, "one");
   og2  = boost::in_place<Guard>(2.0, "two");
-  
+
   BOOST_TEST(og0);
   BOOST_TEST(og1);
   BOOST_TEST(og1_);
   BOOST_TEST(og2);
-  
+
   BOOST_TEST(*og0  == g0);
   BOOST_TEST(*og1  == g1);
   BOOST_TEST(*og1_ == g1);
   BOOST_TEST(*og2  == g2);
-  
+
   BOOST_TEST(og1_ == og1);
   BOOST_TEST(og1_ != og2);
   BOOST_TEST(og1_ != og0);
+
+  boost::optional<unsigned int> o;
+  o = boost::in_place(5);
+  BOOST_TEST(o);
+  BOOST_TEST(*o == 5);
 #endif
 #endif
 }
@@ -101,4 +110,4 @@ int main()
   test_ctor();
   test_assign();
   return boost::report_errors();
-}
+}

test/optional_test_path_assignment.cpp

@@ -0,0 +1,73 @@
+// Copyright (C) 2019 Andrzej Krzemienski.
+//
+// Use, modification, and distribution is 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)
+//
+// See http://www.boost.org/lib/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  akrzemi1@gmail.com
+
+#include "boost/optional/optional.hpp"
+
+#ifdef __BORLANDC__
+#pragma hdrstop
+#endif
+
+#ifndef BOOST_OPTIONAL_DETAIL_NO_IS_CONSTRUCTIBLE_TRAIT
+#ifndef BOOST_OPTIONAL_DETAIL_NO_SFINAE_FRIENDLY_CONSTRUCTORS
+template <typename, typename>
+struct void_t
+{
+  typedef void type;
+};
+
+
+template <typename T, typename = void>
+struct trait
+{
+};
+
+// the following trait emulates properties std::iterator_traits
+template <typename T>
+struct trait<T, BOOST_DEDUCED_TYPENAME void_t<BOOST_DEDUCED_TYPENAME T::value_type,
+                                              BOOST_DEDUCED_TYPENAME boost::enable_if<boost::is_constructible<T, T&> >::type
+                                             >::type>
+{
+  typedef BOOST_DEDUCED_TYPENAME T::value_type value_type;
+};
+
+// This class emulates the properties of std::filesystem::path
+struct Path
+{
+
+#if __cplusplus >= 201103
+    template <typename T, typename = BOOST_DEDUCED_TYPENAME trait<T>::value_type>
+        Path(T const&);
+#else
+  template <typename T>
+    Path(T const&, BOOST_DEDUCED_TYPENAME trait<T>::value_type* = 0);
+#endif
+
+};
+#endif
+#endif
+
+
+int main()
+{
+#ifndef BOOST_OPTIONAL_DETAIL_NO_IS_CONSTRUCTIBLE_TRAIT
+#ifndef BOOST_OPTIONAL_DETAIL_NO_SFINAE_FRIENDLY_CONSTRUCTORS
+
+    boost::optional<Path> optFs1;
+    boost::optional<Path> optFs2;
+
+    optFs1 = optFs2;
+
+    // the following still fails although it shouldn't
+    //BOOST_STATIC_ASSERT((std::is_copy_constructible<boost::optional<Path>>::value));
+
+#endif
+#endif
+}

test/optional_test_ref_converting_ctor.cpp

@@ -93,7 +93,9 @@ template <typename T>
 void test_all_const_cases()
 {
   test_converting_ctor<T>();
+#ifndef BOOST_OPTIONAL_CONFIG_NO_PROPER_CONVERT_FROM_CONST_INT
   test_converting_ctor<const T>();
+#endif
   test_converting_ctor_for_noconst_const<T>();
 }
 

test/optional_test_tc_base.cpp

@@ -58,10 +58,20 @@ struct W
 
 void test_value_init()
 {
+#ifndef BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
 	{
 		S s;
 		W<S> w{s};
 	}
+#endif
+	{
+		S s;
+		W<S> w(s);
+	}
+}
+
+void test_optoinal_reference_wrapper()
+{
 	boost::optional<W<S&> > o;
 	BOOST_TEST(boost::none == o);
 }
@@ -70,6 +80,7 @@ int main()
 {
   test_tc_base();
   test_value_init();
+  test_optoinal_reference_wrapper();
   return boost::report_errors();
 }