[#boost-urls-url_view_base-has_query]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/url_view_base.adoc[url_view_base]::has_query
:relfileprefix: ../../../
:mrdocs:


Return true if a query is present

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/url_view_base.hpp#L1830[boost/url/url_view_base.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
has_query() const noexcept;
----

== Description


This function returns true if this        contains a query. An empty query is        distinct from having no query.


=== Example

[,cpp]
----
assert( url_view( "/sql?id=42&col=name&page-size=20" ).has_query() );
----

=== Complexity

Constant.


=== Exception Safety

Throws nothing.


=== BNF

[,cpp]
----
query           = *( pchar / "/" / "?" )

query-param     = key [ "=" value ]
query-params    = [ query-param ] *( "&" query-param )
----

=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc3986#section-3.4[3.4.  Query (rfc3986)]
        
* link:https://en.wikipedia.org/wiki/Query_string[Query string (Wikipedia)]

Return true if a query is present

This function returns true if this        contains a query. An empty query is        distinct from having no query.


=== Example

[,cpp]
----
assert( url_view( "/sql?id=42&col=name&page-size=20" ).has_query() );
----

=== Complexity

Constant.


=== Exception Safety

Throws nothing.


=== BNF

[,cpp]
----
query           = *( pchar / "/" / "?" )

query-param     = key [ "=" value ]
query-params    = [ query-param ] *( "&" query-param )
----

=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc3986#section-3.4[3.4.  Query (rfc3986)]
        
* link:https://en.wikipedia.org/wiki/Query_string[Query string (Wikipedia)]



== See Also


xref:boost/urls/url_view_base/encoded_params.adoc[encoded_params],            xref:boost/urls/url_view_base/encoded_query.adoc[encoded_query],            xref:boost/urls/url_view_base/params-05.adoc[params],            xref:boost/urls/url_view_base/query.adoc[query].



xref:boost/urls/url_view_base/encoded_params.adoc[encoded_params],            xref:boost/urls/url_view_base/encoded_query.adoc[encoded_query],            xref:boost/urls/url_view_base/params-05.adoc[params],            xref:boost/urls/url_view_base/query.adoc[query].






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