[#boost-urls-params_base-empty]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/params_base.adoc[params_base]::empty
:relfileprefix: ../../../
:mrdocs:


Return true if there are no params

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_base.hpp#L194[boost/url/params_base.hpp]>`

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

== Description



=== Example

[,cpp]
----
assert( ! url_view( "?key=value" ).params().empty() );
----

=== Complexity

Constant.


=== Exception Safety

Throws nothing.





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