[#boost-urls-param_view-2constructor-09]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/param_view.adoc[param&lowbar;view]::param&lowbar;view
:relfileprefix: ../../../
:mrdocs:


== Synopsis


Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/param.hpp#L459[boost&sol;url&sol;param&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:boost/urls/param_view/2constructor-07a.adoc[param&lowbar;view]() = default;
----

[.small]#xref:boost/urls/param_view/2constructor-07a.adoc[_» more..._]#

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class OptionalString&gt;
xref:boost/urls/param_view/2constructor-01.adoc[param&lowbar;view](
    core::string&lowbar;view key,
    OptionalString const& value) noexcept;
----

[.small]#xref:boost/urls/param_view/2constructor-01.adoc[_» more..._]#

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/param_view/2constructor-07e.adoc[param&lowbar;view](xref:boost/urls/param.adoc[param] const& other) noexcept;
----

[.small]#xref:boost/urls/param_view/2constructor-07e.adoc[_» more..._]#

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/param_view/2constructor-03.adoc[param&lowbar;view](
    core::string&lowbar;view key&lowbar;,
    core::string&lowbar;view value&lowbar;,
    bool has&lowbar;value&lowbar;) noexcept;
----

[.small]#xref:boost/urls/param_view/2constructor-03.adoc[_» more..._]#

== Template Parameters


|===
| 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


|===
| Name | Description

| *key,*
| value The key and value to set&period;


| *other*
| The param to reference


|===



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