Members
template<class R_>
constexpr
optional_rule_t<R_>
optional_rule(R_ const& r);
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template<class Rule>
constexpr
optional_rule_t<Rule>
optional_rule(Rule const& r);
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template<class R_>
constexpr
optional_rule_t<R_>
optional_rule(R_ const& r);
» more...
template<class Rule>
constexpr
optional_rule_t<Rule>
optional_rule(Rule const& r);
» more...