No need to deep-copy the boost::exception base

include/boost/throw_exception.hpp

@@ -113,14 +113,28 @@ private:
         ~deleter() { delete p_; }
     };
 
+private:
+
+    void copy_from( void const* )
+    {
+    }
+
+    void copy_from( boost::exception const* p )
+    {
+        static_cast<boost::exception&>( *this ) = *p;
+    }
+
 public:
 
     explicit wrapexcept( E const & e ): E( e )
     {
+        copy_from( &e );
     }
 
     explicit wrapexcept( E const & e, boost::source_location const & loc ): E( e )
     {
+        copy_from( &e );
+
         set_info( *this, throw_file( loc.file_name() ) );
         set_info( *this, throw_line( loc.line() ) );
         set_info( *this, throw_function( loc.function_name() ) );

test/throw_exception_test5.cpp

@@ -18,6 +18,10 @@ class my_exception: public std::exception, public boost::exception
 {
 };
 
+class my_exception2: public std::exception, public virtual boost::exception
+{
+};
+
 int main()
 {
     try
@@ -62,5 +66,47 @@ int main()
         }
     }
 
+    try
+    {
+        boost::throw_exception( my_exception2() << error_code( 123 ) << error_string( "error%%string" ) );
+    }
+    catch( boost::exception const & x )
+    {
+        {
+            int const * code = boost::get_error_info<error_code>( x );
+
+            BOOST_TEST( code != 0 );
+            BOOST_TEST_EQ( *code, 123 );
+        }
+
+        {
+            std::string const * str = boost::get_error_info<error_string>( x );
+
+            BOOST_TEST( str != 0 );
+            BOOST_TEST_EQ( *str, "error%%string" );
+        }
+    }
+
+    try
+    {
+        BOOST_THROW_EXCEPTION( my_exception2() << error_code( 123 ) << error_string( "error%%string" ) );
+    }
+    catch( boost::exception const & x )
+    {
+        {
+            int const * code = boost::get_error_info<error_code>( x );
+
+            BOOST_TEST( code != 0 );
+            BOOST_TEST_EQ( *code, 123 );
+        }
+
+        {
+            std::string const * str = boost::get_error_info<error_string>( x );
+
+            BOOST_TEST( str != 0 );
+            BOOST_TEST_EQ( *str, "error%%string" );
+        }
+    }
+
     return boost::report_errors();
 }