:relfileprefix: ../../../
[#B90DF7D6FC12879DE2E1FF5CDCD7C63D46A5E04D]

= Function variant_rule



== Synopsis

Declared in header `</boost/url/grammar/variant_rule.hpp#L94[boost/url/grammar/variant_rule.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
template<
    class R0_,
    class... Rn_>
constexpr
xref:boost/urls/grammar/variant_rule_t.adoc[variant_rule_t]<R0_, Rn_...>
variant_rule(
    const R0_& r0,
    const Rn_&... rn) noexcept;
----