[#boost-urls-param-2constructor-09b]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/param.adoc[param]::param
:relfileprefix: ../../../
:mrdocs:

Constructor

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/param.hpp#Lundefined[boost&sol;url&sol;param&period;hpp]&gt;`

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

== Description

Default constructed query parameters have an empty key and no value&period;

== Example

[,cpp]
----
param qp;
----
== Postconditions

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

Constant&period;

== Exception Safety

Throws nothing&period;


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