[#boost-urls-params_ref-append-07]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/params_ref.adoc[params&lowbar;ref]::append
:relfileprefix: ../../../
:mrdocs:

Append elements

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_ref.hpp#L422[boost&sol;url&sol;params&lowbar;ref&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/params_base/iterator.adoc[iterator]
append(std::initializer&lowbar;list&lt;param&lowbar;view&gt; init);
----

== Description

This function appends the params in an _initializer&hyphen;list_ to the view&period;

The `end()` iterator is invalidated&period;

== Example

[,cpp]
----
url u;

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

Linear in `this&hyphen;&gt;url()&period;encoded&lowbar;query()&period;size()`&period;

== Exception Safety

Strong guarantee&period; Calls to allocate may throw&period;

== Return Value

An iterator to the first new element&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *init*
| The list of params to append&period;
|===


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