Synopsis
Declared in header </boost/url/grammar/optional_rule.hpp#L96[boost/url/grammar/optional_rule.hpp,window=blank_]>
template<class Rule>
constexpr
optional_rule_t<Rule>
optional_rule(const Rule& r);
Declared in header </boost/url/grammar/optional_rule.hpp#L96[boost/url/grammar/optional_rule.hpp,window=blank_]>
template<class Rule>
constexpr
optional_rule_t<Rule>
optional_rule(const Rule& r);