void swap(expected& rhs)
{
if (m_success)
{
if (rhs.m_success)
{
using std::swap;
swap(m_value, rhs.m_value);
}
else
{
auto t = std::move(rhs.spam);
new (&rhs.m_value) T(std::move(m_value));
new (&m_excptr) std::exception_ptr(t);
std::swap(m_success, rhs.m_success);
}
}
else
{
if (rhs.m_success)
{
rhs.swap(*this);
}
else
{
m_excptr.swap(rhs.m_excptr);
std::swap(m_success, rhs.m_success);
}
}
}
void swap( expected & rhs )
{
using std::swap;
if ( has_value == true && rhs.has_value == true ) { swap( contained.value(), rhs.contained.value() ); }
else if ( has_value == false && rhs.has_value == false ) { swap( contained.error(), rhs.contained.error() ); }
else if ( has_value == false && rhs.has_value == true ) { rhs.swap( *this ); }
else if ( has_value == true && rhs.has_value == false ) { error_type t = rhs.contained.error();
rhs.contained.destruct_error();
rhs.contained.construct_value( contained.value() );
contained.construct_error( t );
swap( has_value, rhs.has_value );
}
}
bool has_unexpected(expected<T, boost::exception_ptr> const& e)
{
try {
if(!e) boost::rethrow_exception(e.error());
}
catch(Ex& e)
{
return true;
}
catch(...)
{
}
return false;
}
void operator()(expected<T>& x) {
if (x)
(*this)(*x);
else
(*this)(x.error());
}
BOOST_CONSTEXPR bool has_error(expected<T, E> const& e, E1 const& err)
{
return (e) ? false : (e.error() == err) ;
}
optional<T> make_optional(expected<T> e) {
if (e.valid()) return optional<T>(*e);
else return none;
}
void swap( expected<T,E> & x, expected<T,E> & y )
{
x.swap( y );
}