[#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#L1920[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
* https://datatracker.ietf.org/doc/html/rfc3986#section-3.4[]
* https://en.wikipedia.org/wiki/Query_string[]

== Return Value

`true` if a query is present.

== 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-065.adoc[`params`], xref:boost/urls/url_view_base/query.adoc[`query`].


[.small]#Created with https://www.mrdocs.com[MrDocs]#