Add BOOST_MSVC_ENABLE_2012_NOV_CTP macro to allow users to explicitly enable use of VC++ November 2012 Community Technology Preview. C++11 features supplied by this CTP are not enabled by default since they represent unsupported alpha-level code that should not be used for production work.

[SVN r82514]

doc/html/boost_config/boost_macro_reference.html

@@ -3105,6 +3105,25 @@
 </blockquote></div>
               </td>
 </tr>
+<tr>
+<td>
+                <p>
+                  <code class="computeroutput"><span class="identifier">BOOST_MSVC_ENABLE_2012_NOV_CTP</span></code>
+                </p>
+              </td>
+<td>
+                <p>
+                  For Microsoft Visual C++ 2012, enable the C++11 features supplied
+                  by the November 2012 Community Technology Preview. These features
+                  are not automatically enabled because the CTP is non-supported
+                  alpha code that is not recommended for production use. This macro
+                  must be defined before including any Boost headers, and must be
+                  defined for all translation units in the program, including Boost
+                  library builds. This macro will no longer have any effect once
+                  an official Microsoft release supports the CTP features.
+                </p>
+              </td>
+</tr>
 </tbody>
 </table></div>
 </div>

doc/html/index.html

@@ -951,7 +951,7 @@
 </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: January 03, 2013 at 13:01:40 GMT</small></p></td>
+<td align="left"><p><small>Last revised: January 17, 2013 at 02:10:17 GMT</small></p></td>
 <td align="right"><div class="copyright-footer"></div></td>
 </tr></table>
 <hr>

doc/macro_reference.qbk

@@ -724,6 +724,15 @@ If `BOOST_NO_CXX11_NOEXCEPT` is not defined (i.e. C++11 compliant compilers) the
 ``
 ]
 ]]
+[[`BOOST_MSVC_ENABLE_2012_NOV_CTP`][
+For Microsoft Visual C++ 2012, enable the C++11 features supplied by the
+November 2012 Community Technology Preview. These features are not automatically
+enabled because the CTP is non-supported alpha code that is not recommended
+for production use. This macro must be defined before including any Boost headers,
+and must be defined for all translation units in the program, including Boost library builds.
+This macro will no longer have any effect once an official Microsoft
+release supports the CTP features.
+]]
 ]
 
 [endsect]

include/boost/config/compiler/visualc.hpp

@@ -134,10 +134,6 @@
 // (Niels Dekker, LKEB, May 2010)
 #  define BOOST_NO_COMPLETE_VALUE_INITIALIZATION
 
-#if _MSC_VER < 1600  || !defined(BOOST_STRICT_CONFIG) // 150X == VC++ 9.0
-#  define BOOST_NO_CXX11_HDR_INITIALIZER_LIST
-#endif
-
 #ifndef _NATIVE_WCHAR_T_DEFINED
 #  define BOOST_NO_INTRINSIC_WCHAR_T
 #endif
@@ -221,24 +217,31 @@
 #  define BOOST_NO_CXX11_SCOPED_ENUMS
 #endif // _MSC_VER < 1700
 
-// C++0x features not supported by any versions
+// C++11 features supported by VC++ 11 (aka 2012) November 2012 CTP
+// Because the CTP is unsupported, unrelease, and only alpha quality,
+// it is only supported if BOOST_ENABLE_MSVC_2012_NOV_CTP is defined.
+//
+#if _MSC_FULL_VER < 170051025 || !defined(BOOST_MSVC_ENABLE_2012_NOV_CTP)
+#  define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
+#  define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
+#  define BOOST_NO_CXX11_RAW_LITERALS
+#  define BOOST_NO_CXX11_VARIADIC_TEMPLATES
+#  define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
+#endif
+
+// C++11 features not supported by any versions
 #define BOOST_NO_CXX11_CHAR16_T
 #define BOOST_NO_CXX11_CHAR32_T
 #define BOOST_NO_CXX11_CONSTEXPR
 #define BOOST_NO_CXX11_DECLTYPE_N3276
 #define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
 #define BOOST_NO_CXX11_DELETED_FUNCTIONS
-#define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
-#define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
-#define BOOST_NO_CXX11_HDR_INITIALIZER_LIST
 #define BOOST_NO_CXX11_NOEXCEPT
-#define BOOST_NO_CXX11_RAW_LITERALS
 #define BOOST_NO_CXX11_TEMPLATE_ALIASES
 #define BOOST_NO_CXX11_UNICODE_LITERALS
-#define BOOST_NO_CXX11_VARIADIC_TEMPLATES
 #define BOOST_NO_SFINAE_EXPR
 #define BOOST_NO_TWO_PHASE_NAME_LOOKUP
-#define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
+
 //
 // prefix and suffix headers:
 //