:relfileprefix: ../../../
[#boost-urls-param-2constructor-09]

== xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/param.adoc[pass:[param]]::param


Constructor


=== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/param.hpp#L124[boost/url/param.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
constexpr
param() = default;
----

=== Description


Default constructed query parameters
have an empty key and no value.
[,cpp]
----
param qp;
----
[,cpp]
----
this->key == "" && this->value == "" && this->has_value == false
----

=== Constant.

=== Throws nothing.