:relfileprefix: ../../../
[#boost-urls-param_view-2constructor-07a]

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


Constructor


== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/param.hpp#L455[boost/url/param.hpp,window=blank_]>`

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

== Description


Default constructed query parameters
have an empty key and no value.

=== Example
[,cpp]
----
param_view qp;
----

=== Postconditions
[,cpp]
----
this->key == "" && this->value == "" && this->has_value == false
----

=== Complexity

Constant.

=== Exception Safety

Throws nothing.