[#boost-urls-param_view-2constructor-01]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/param_view.adoc[param_view]::param_view
:relfileprefix: ../../../
:mrdocs:


Constructor

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/param.hpp#L497[boost/url/param.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class OptionalString>
param_view(
    core::string_view key,
    OptionalString const& value) noexcept;
----

== Description


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


=== 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.


=== Exception Safety

Throws nothing.



== Template Parameters


|===
| 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


|===
| Name | Description

| *key,*
| value The key and value to set.


|===



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