boost::urls::grammar::see_below::is_rule<T, void_t<decltype(std::declval<system::result<typename T::value_type>&>() =

            std&colon;&colon;declval&lt;char const&ast;&gt;()))&gt;&gt;
:relfileprefix: ../../../../
:mrdocs:

Synopsis

Declared in <include/boost/url/grammar/type_traits.hpp>

template<class T>
struct is_rule<T, void_t<decltype(std::declval<system::result<typename T::value_type>&>() =
        std::declval<T const&>().parse(
            std::declval<char const*&>(),
            std::declval<char const*>()))>>
    : std::is_nothrow_copy_constructible<T>;

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