:relfileprefix: ../../../
[#boost-urls-params_ref-append-07]

== 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#L410[boost/url/params_ref.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
xref:boost/urls/params_base/iterator.adoc[iterator]
append(std::initializer_list<xref:boost/urls/param_view.adoc[param_view]> init);
----

=== Description


This function appends the params in
an
_initializer-list_
to the view.



The `end()` iterator is invalidated.
[,cpp]
----
url u;

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

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

=== Strong guarantee.

Calls to allocate may throw.




=== Return Value


An iterator to the first new element.



=== Parameters

|===
| Name | Description 

| *init*
| 
The list of params to append.

|===