[#boost-urls-string_token-is_token]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/string_token.adoc[string&lowbar;token]::is&lowbar;token
:relfileprefix: ../../../
:mrdocs:


Trait to determine if a type is a string token

== Synopsis


Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/string_token.hpp#L127[boost&sol;url&sol;grammar&sol;string&lowbar;token&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class T&gt;
using is&lowbar;token = &sol;&ast; implementation-defined &ast;&sol;::xref:boost/urls/string_token/implementation_defined/is_token.adoc[is&lowbar;token]&lt;T&gt;;
----

== Description


This trait returns `true` if `T` is a valid    xref:boost/urls/string_token/StringToken.adoc[StringToken] type, and `false` otherwise&period;


=== Example

[,cpp]
----
static_assert( string_token::is_token<T>::value );
----




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