[#boost-urls-grammar-unsigned_rule]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/grammar.adoc[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#L82[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


|===
| Name | Description

| *Unsigned*
| The unsigned integer type used    to store the result&period;


|===

== See Also


xref:boost/urls/grammar/parse-02.adoc[grammar&colon;&colon;parse]&period;






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