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

Constructors

== Synopses

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/param.hpp#L721[boost/url/param.hpp]>`

Constructor


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:boost/urls/param_pct_view/2constructor-00.adoc[param_pct_view]() = default;
----

[.small]#xref:boost/urls/param_pct_view/2constructor-00.adoc[_» more..._]#

Construction


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
xref:boost/urls/param_pct_view/2constructor-03.adoc[param_pct_view](xref:boost/urls/param_view.adoc[param_view] const& p);
----

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

Constructor


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/param_pct_view/2constructor-0e.adoc[param_pct_view](
    xref:boost/urls/pct_string_view.adoc[pct_string_view] key,
    xref:boost/urls/pct_string_view.adoc[pct_string_view] value) noexcept;
----

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

Constructor


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class OptionalString>
xref:boost/urls/param_pct_view/2constructor-05.adoc[param_pct_view](
    xref:boost/urls/pct_string_view.adoc[pct_string_view] key,
    OptionalString const& value);
----

[.small]#xref:boost/urls/param_pct_view/2constructor-05.adoc[_» more..._]#

Aggregate construction


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/param_pct_view/2constructor-02.adoc[param_pct_view](
    xref:boost/urls/pct_string_view.adoc[pct_string_view] key,
    xref:boost/urls/pct_string_view.adoc[pct_string_view] value,
    bool has_value) noexcept;
----

[.small]#xref:boost/urls/param_pct_view/2constructor-02.adoc[_» more..._]#

== Exceptions

[cols=2]
|===
| Name
| Thrown on
| `system_error`
| `key` or `value` contains an invalid percent escape.
|===

== Return Value

A param object

== Template Parameters

[cols=2]
|===
| Name
| Description
| *OptionalString*
| An optional `core::string_view` type, such as `boost::optional<core::string_view>` or `std::optional<core::string_view>`.
|===

== Parameters

[cols=2]
|===
| Name
| Description
| *p*
| The param 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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