ElementTypeT& UnknownElement::ConvertTo() {
CastVisitor_T<ElementTypeT> castVisitor;
m_pImp->Accept(castVisitor);
if (castVisitor.m_pElement == 0) {
// we're not the right type. fix it & try again
*this = ElementTypeT();
m_pImp->Accept(castVisitor);
}
return *castVisitor.m_pElement;
}
ElementTypeT& UnknownElement::CastTo()
{
CastVisitor<ElementTypeT> castVisitor;
Accept(castVisitor);
// If this element is uninitialized, implicitly convert it to the desired type
if (castVisitor.is_null) {
*this = ElementTypeT();
return *this;
}
// Otherwise throw an exception
if (!castVisitor.element)
throw Exception("Bad cast");
return *castVisitor.element;
}