Hi
how exactly should the boost::optional trait be used with dbo? I try
to make a member like
boost::optional<Wt::WString> briefSrc;
and map with
template<class Action>
void persist(Action& a)
{
dbo::field(a, state, "state");
dbo::field(a, date, "date");
dbo::field(a, title, "title");
dbo::field(a, briefSrc, "brief_src");
dbo::field(a, briefHtml, "brief_html");
dbo::field(a, bodySrc, "body_src");
dbo::field(a, bodyHtml, "body_html");
}
Then I get errors like these
/opt/packages/wt/src/Wt/Dbo/Field_impl.h: In member function
'std::string Wt::Dbo::FieldRef<V>::sqlType(Wt::Dbo::Session&) const
[with V = boost::optional<Wt::WString>]':
/opt/packages/wt/src/Wt/Dbo/DbAction_impl.h:97: instantiated from
'void Wt::Dbo::CreateSchema::act(const Wt::Dbo::FieldRef<V>&) [with V
= boost::optional<Wt::WString>]'
/opt/packages/wt/src/Wt/Dbo/Field_impl.h:134: instantiated from
'void Wt::Dbo::field(Action&, V&, const std::string&, int) [with
Action = Wt::Dbo::CreateSchema, V = boost::optional<Wt::WString>]'
/opt/packages/wt/examples/dbo/Post.h:58: instantiated from 'void
Post::persist(Action&) [with Action = Wt::Dbo::CreateSchema]'
/opt/packages/wt/src/Wt/Dbo/DbAction_impl.h:19: instantiated from
'static void Wt::Dbo::persist<C, Enable>::apply(C&, A&) [with A =
Wt::Dbo::CreateSchema, C = Post, Enable = void]'
/opt/packages/wt/src/Wt/Dbo/DbAction_impl.h:82: instantiated from
'void Wt::Dbo::CreateSchema::visit(C&) [with C = Post]'
/opt/packages/wt/src/Wt/Dbo/Session_impl.h:234: instantiated from
'void
Wt::Dbo::Session::ClassMapping<C>::createTable(Wt::Dbo::Session&,
std::set<std::basic_string<char, std::char_traits<char>,
std::allocator<char> >, std::less<std::basic_string<char,
std::char_traits<char>, std::allocator<char> > >,
std::allocator<std::basic_string<char, std::char_traits<char>,
std::allocator<char> > > >&) [with C = Post]'
/opt/packages/wt/examples/dbo/Post.C:16: instantiated from here
/opt/packages/wt/src/Wt/Dbo/Field_impl.h:41: error: no matching
function for call to
'Wt::Dbo::sql_value_traits<boost::optional<Wt::WString>,
void>::type(Wt::Dbo::SqlConnection*, const int&)'
/opt/packages/wt/src/Wt/Dbo/StdSqlTraits:116: note: candidates are:
static std::string Wt::Dbo::sql_value_traits<boost::optional<T>,
void>::type(Wt::Dbo::SqlConnection*) [with T = Wt::WString]
given that the candidate suggested by the compiler appears to be the
correct one, I am wondering if there is a compiler bug.... I am using
the standard 4.2 g++ ((Apple Inc. build 5577)) under OS X 10.5.8 or is
there some other trick to getting the template instantiation to happen
when using boost::optional?
Regards,
Paul.
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