[#boost-urls-param-2constructor-04]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/param.adoc[param]::param
:relfileprefix: ../../../
:mrdocs:

Constructors

== Synopses

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

Constructor


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:boost/urls/param/2constructor-09b.adoc[param]() = default;
----

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Constructor


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:boost/urls/param/2constructor-0d.adoc[param](xref:boost/urls/param.adoc[param] const& other) = default;
----

[.small]#xref:boost/urls/param/2constructor-0d.adoc[_» more..._]#

Constructor


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

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Constructor


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class OptionalString>
xref:boost/urls/param/2constructor-0b.adoc[param](
    core::string_view key,
    OptionalString const& value);
----

[.small]#xref:boost/urls/param/2constructor-0b.adoc[_» more..._]#

Aggregate construction


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/param/2constructor-0a.adoc[param](
    core::string_view key,
    core::string_view value,
    bool has_value) noexcept;
----

[.small]#xref:boost/urls/param/2constructor-0a.adoc[_» more..._]#

== Return Value

A reference to this object.

== Template Parameters

[cols=2]
|===
| Name
| Description
| *OptionalString*
| An optional string type, such as `core::string_view`, `std::nullptr`, xref:boost/urls/no_value_t.adoc[`no_value_t`], or `optional<core::string_view>`.
|===

== Parameters

[cols=2]
|===
| Name
| Description
| *other*
| The object to construct from.
| *key*
| The key to set.
| *value*
| The value to set.
| *has_value*
| True if a value is present.
|===


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