#include "boost/optional/optional.hpp"

#ifdef BOOST_BORLANDC

#pragma hdrstop

#endif

#ifndef BOOST_OPTIONAL_DETAIL_NO_IS_CONSTRUCTIBLE_TRAIT

#ifndef BOOST_OPTIONAL_DETAIL_NO_SFINAE_FRIENDLY_CONSTRUCTORS

template <typename, typename>

struct void_t

{

typedef void type;

};

template <typename T, typename = void>

struct trait

{

};

template <typename T>

struct trait<T, BOOST_DEDUCED_TYPENAME void_t<BOOST_DEDUCED_TYPENAME T::value_type,

BOOST_DEDUCED_TYPENAME boost::enable_if<boost::is_constructible<T, T&> >::type

>::type>

{

typedef BOOST_DEDUCED_TYPENAME T::value_type value_type;

};

struct Path

};

#endif

#endif

int main()

}