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

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

  


Append elements



=== Synopsis
  

[source,cpp,subs="verbatim,macros,-callouts"]
----
xref:boost/urls/params_base/iterator.adoc[iterator]
xref:boost/urls/params_ref/append-0f.adoc[pass:[append]](xref:boost/urls/param_view.adoc[param_view] const& p);
----

[source,cpp,subs="verbatim,macros,-callouts"]
----
xref:boost/urls/params_base/iterator.adoc[iterator]
xref:boost/urls/params_ref/append-07.adoc[pass:[append]](std::initializer_list<xref:boost/urls/param_view.adoc[param_view]> init);
----

[source,cpp,subs="verbatim,macros,-callouts"]
----
template<class FwdIt>
xref:boost/urls/params_base/iterator.adoc[iterator]
xref:boost/urls/params_ref/append-0c.adoc[pass:[append]](
    FwdIt first,
    FwdIt last);
----
  
=== Description


This function appends a param to the view.



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

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

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

=== Strong guarantee.

Calls to allocate may throw.



=== Return Value


An iterator to the new element.



=== Parameters

|===
| Name | Description 

| *p*
| 
The param to append.

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

| *first,*
| 
last The range of params
to append.

|===