has_trivial_destructor and dtor optimization done.

[SVN r77235]

test/Jamfile.v2

@@ -29,5 +29,6 @@ import testing ;
     [ compile-fail optional_test_ref_fail4.cpp ]
     [ compile-fail optional_test_inplace_fail.cpp ]
     [ compile-fail optional_test_inplace_fail2.cpp ]
+    [ compile  optional_test_trivial_assertions.cpp ]
   ;
 }

test/optional_test_trivial_assertions.cpp

@@ -0,0 +1,30 @@
+#include "boost/optional.hpp"
+#include "boost/static_assert.hpp"
+#include "boost/type_traits.hpp"
+
+using namespace boost;
+
+typedef optional<char>        oc;
+typedef optional<int>         oi;
+typedef optional<std::string> os;
+
+BOOST_STATIC_ASSERT( sizeof(oc) <= 2*sizeof(char) );
+BOOST_STATIC_ASSERT( sizeof(oi) <= 2*sizeof(int)  );
+
+BOOST_STATIC_ASSERT( !has_trivial_default_constructor<oi>::value );  //never true for optional
+BOOST_STATIC_ASSERT( !has_trivial_default_constructor<os>::value );
+
+BOOST_STATIC_ASSERT(  has_trivial_destructor<oi>::value );  //should be true where has_trivial_destructor<T>
+BOOST_STATIC_ASSERT( !has_trivial_destructor<os>::value );
+
+
+/*
+has_trivial_assign
+has_trivial_constructor
+has_trivial_copy
+has_trivial_copy_constructor
+has_trivial_default_constructor
+has_trivial_destructor
+ */
+
+