Committing changes merged from trunk, most notably optional non-intrusive exception_ptr support for MSVC.

[SVN r70974]

test/exception_ptr_test.cpp

@@ -10,6 +10,7 @@
 #include <boost/function.hpp>
 #include <boost/bind.hpp>
 #include <boost/thread.hpp>
+#include <boost/detail/atomic_count.hpp>
 #include <boost/detail/lightweight_test.hpp>
 #include <iostream>
 
@@ -66,7 +67,34 @@ join( thread_handle & t )
         rethrow_exception(t.err_);
     }
 
-struct exc: boost::exception, std::exception { };
+boost::detail::atomic_count exc_count(0);
+
+struct
+exc:
+    virtual boost::exception,
+    virtual std::exception
+    {
+    exc()
+        {
+        ++exc_count;
+        }
+
+    exc( exc const & )
+        {
+        ++exc_count;
+        }
+
+    virtual
+    ~exc() throw()
+        {
+        --exc_count;
+        }
+
+    private:
+
+    exc & operator=( exc const & );
+    };
+
 typedef boost::error_info<struct answer_,int> answer;
 
 void
@@ -93,6 +121,7 @@ check( boost::shared_ptr<thread_handle> const & t )
 int
 main()
     {
+    BOOST_TEST(++exc_count==1);
     try
         {
         std::vector< boost::shared_ptr<thread_handle> > threads;
@@ -109,4 +138,5 @@ main()
             boost::current_exception_diagnostic_information() << std::endl;
         return 42;
         }
+    BOOST_TEST(!--exc_count);
     }