+
+ template<typename S, typename T>
+ void load_sub(S &s, T &p)
+ { load_sub<typename S::Loader, S, T>(s, p); }
+
+ /**
+ Loads a sub-object with a custom Loader class that takes one argument in
+ addition to to object to be loaded.
+ */
+ template<typename L, typename S, typename T>
+ void load_sub(S &s, T &p)
+ {
+ if(!cur_st)
+ throw InvalidState("load_sub called without current statement");
+ L loader(s, p);
+ loader.load(*cur_st);
+ }
+
+ /**
+ Returns the source of the statement being processed. This can be used to
+ implement relative paths in include-like statements. Note that the source
+ may not necessarily be a file.
+ */
+ const std::string &get_source() const
+ {
+ if(!cur_st)
+ throw InvalidState("get_source called without current statement");
+ return cur_st->source;
+ }