:relfileprefix: ../../../
[#boost-urls-params_ref-append-0f]

= xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/params_ref.adoc[pass:[params_ref]]::append


Append elements


== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_ref.hpp#L380[boost/url/params_ref.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
xref:boost/urls/params_base/iterator.adoc[iterator]
append(xref:boost/urls/param_view.adoc[param_view] const& p);
----

== Description


This function appends a param to the view.



The `end()` iterator is invalidated.

=== Example
[,cpp]
----
url u;

u.params().append( { "first", "John" } );
----

=== Complexity

Linear in `this-&gt;url().encoded_query().size()`.

=== Exception Safety

Strong guarantee.
Calls to allocate may throw.




== Return Value


An iterator to the new element.



== Parameters

|===
| Name | Description 

| *p*
| 
The param to append.

|===