:relfileprefix: ../../../
[#boost-urls-grammar-variant_rule-0b]

= xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/grammar.adoc[pass:[grammar]]::variant_rule



== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/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(
    R0_ const& r0,
    Rn_ const&... rn) noexcept;
----