[#boost-urls-param_view-2constructor-01]
= xref:boost/urls/param_view/2constructor-01.adoc[boost::urls::param&lowbar;view::param&lowbar;view]
:relfileprefix: ../../../
:mrdocs:

Constructor

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/param.hpp#L517[boost&sol;url&sol;param&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class OptionalString&gt;
param&lowbar;view(
    core::string&lowbar;view key,
    OptionalString const& value) noexcept;
----

== Description

This constructs a parameter with a key and value&period; No validation is performed on the strings&period; The new key and value reference the same corresponding underlying character buffers&period; Ownership of the buffers is not transferred&semi; the caller is responsible for ensuring that the assigned buffers remain valid until they are no longer referenced&period;

== Example
[,cpp]
----
param_view qp( "key", "value" );
----
== Postconditions
[,cpp]
----
this->key.data() == key.data() && this->value.data() == value.data() && this->has_value == true
----
== Complexity
Constant&period;

== Exception Safety
Throws nothing&period;

== Template Parameters

[cols=2]
|===
| Name
| Description
| *OptionalString*
| An optional string type, such as `core&colon;&colon;string&lowbar;view`, `std&colon;&colon;nullptr`, xref:boost/urls/no_value_t.adoc[`no&lowbar;value&lowbar;t`], or `optional&lt;core&colon;&colon;string&lowbar;view&gt;`&period;
|===

== Parameters

[cols=2]
|===
| Name
| Description
| *key*
| The key to set&period;
| *value*
| The value to set&period;
|===


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