:relfileprefix: ../../../../
[#boost-urls-string_token-see_below-is_token-0e]

== xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/string_token.adoc[pass:[string_token]]::xref:boost/urls/string_token/see_below.adoc[pass:[see_below]]::is_token


Metafunction returning true if T is a StringToken


=== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/string_token.hpp#L106[boost/url/grammar/string_token.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
template<class T>
struct xref:boost/urls/string_token/see_below/is_token-05.adoc[pass:[is_token]]<T, void_t<decltype(std::declval<T&>().prepare(
                std::declval<std::size_t>())), decltype(std::declval<T&>().result())>>
    : std::integral_constant<bool, std::is_convertible<decltype(std::declval<T &>().result()), typename T::result_type>::value && std::is_same<decltype(std::declval<T &>().prepare(0)), char *>::value && std::is_base_of<arg, T>::value && std::is_convertible<const volatile T *, const volatile arg *>::value>;
----