[#boost-urls-param_view-2constructor-0e]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/param_view.adoc[param_view]::param_view
:relfileprefix: ../../../
:mrdocs:

Constructors

== Synopses

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/param.hpp#L474[boost/url/param.hpp]>`

Constructor


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

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

Constructor


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

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

Constructor


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

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

Aggregate construction


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/param_view/2constructor-035.adoc[param_view](
    core::string_view key_,
    core::string_view value_,
    bool has_value_) noexcept;
----

[.small]#xref:boost/urls/param_view/2constructor-035.adoc[_» more..._]#

== 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 param to reference
| *key*
| The key to set.
| *value*
| The value to set.
| *key_*
| The key to set.
| *value_*
| The value to set.
| *has_value_*
| True if a value is present.
|===


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