{

std::stringstream s ;

const int markv = 123 ;

int mark = 0 ;

s << o << " " << markv ;

s >> buff >> mark ;

BOOST_TEST( buff == o ) ;

BOOST_TEST( mark == markv ) ;

{

test2( make_optional(v), optional<T> ());

test2( make_optional(v), make_optional(w));

test2( optional<T> () , optional<T> ());

test2( optional<T> () , make_optional(w));

{

std::stringstream s;

s << boost::none;

s >> ov;

BOOST_TEST(!ov);

{

std::stringstream s, r;

optional<T> ov;

s << boost::none;

r << ov;

BOOST_TEST_EQ(s.str(), r.str());

{

subtest_tag_none_reversibility_with_optional(optional<T>(v));

subtest_tag_none_reversibility_with_optional(optional<T>());

subtest_tag_none_equivalence_with_optional<T>();

{

test(1,2);

test(std::string("hello"), std::string("buffer"));

test_tag_none(10);

test_tag_none(std::string("text"));

return boost::report_errors();