[#boost-urls-grammar-unsigned_rule]
= xref:boost/urls/grammar/unsigned_rule.adoc[boost::urls::grammar::unsigned_rule]
:relfileprefix: ../../../
:mrdocs:

Match an unsigned decimal

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/unsigned_rule.hpp#L52[boost/url/grammar/unsigned_rule.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class Unsigned>
struct unsigned_rule;
----

== Types

[cols=1]
|===
| Name
| xref:boost/urls/grammar/unsigned_rule/value_type.adoc[`value_type`] 
|===

== Member Functions

[cols=1]
|===
| Name
| xref:boost/urls/grammar/unsigned_rule/parse.adoc[`parse`] 
|===

== Description

Extra leading zeroes are disallowed.

== Value Type
[,cpp]
----
using value_type = Unsigned;
----
== Example
Rules are used with the function xref:boost/urls/grammar/unsigned_rule/parse.adoc[`parse`].

[,cpp]
----
system::result< unsigned short > rv = parse( "32767", unsigned_rule< unsigned short >{} );
----
== BNF
[,cpp]
----
unsigned      = "0" / ( ["1"..."9"] *DIGIT )
----
== Template Parameters

[cols=2]
|===
| Name
| Description
| *Unsigned*
| The unsigned integer type used to store the result&period;
|===

== See Also

xref:boost/urls/grammar/parse-09.adoc[`grammar&colon;&colon;parse`]&period;


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