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#ifndef NULL_TRAITS_H
#define NULL_TRAITS_H
template <class V>
struct null_traits {
static V null; //TODO: maybe take out default null and make ppl explicitly define? they may be surprised that they need to when they include a header lib that uses null_traits
};
// global bool is_null(V const& v)
// definitely override this, and possibly set_null and is_null. that's the point.
template <class V>
V null_traits<V>::null;
//TODO: are we getting single init of the static null object?
template <class V>
void set_null(V &v) {
v=null_traits<V>::null;
}
template <class V>
void is_null(V const& v) {
return v==null_traits<V>::null;
}
#endif
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