The reference type.
using reference = param_pct_view;
Objects of this type represent a single key and value pair in a query string
where a key is always present and may be empty, while the presence of a
value is indicated by
has_value equal to true. An empty
value is distinct from no value. The strings may have percent escapes,
and offer an additional invariant: they never contain an invalid percent-encoding.
For most usages, key comparisons are case-sensitive and duplicate keys
in a query are possible. However, it is the authority that has final control
over how the query is interpreted.
Keys and values in this object reference external character buffers. Ownership of the buffers is not transferred; the caller is responsible for ensuring that the assigned buffers remain valid until they are no longer referenced.
query-params = query-param *( "&" query-param ) query-param = key [ "=" value ] key = *qpchar value = *( qpchar / "=" )
This is the type of value returned when iterators of the view are dereferenced.