[#boost-urls-params_encoded_ref-append-0e]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/params_encoded_ref.adoc[params&lowbar;encoded&lowbar;ref]::append
:relfileprefix: ../../../
:mrdocs:


Append params

== Synopsis


Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_encoded_ref.hpp#L396[boost&sol;url&sol;params&lowbar;encoded&lowbar;ref&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/params_encoded_base/iterator.adoc[iterator]
append(std::initializer&lowbar;list&lt;xref:boost/urls/param_pct_view.adoc[param&lowbar;pct&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.encoded_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;        Exceptions thrown on invalid input&period;



== Exceptions


|===
| Name | Thrown on

| `system&lowbar;error`
| `init` contains an invalid percent&hyphen;encoding&period;


|===

== Return Value


An iterator to the first new element&period;



== Parameters


|===
| Name | Description

| *init*
| The list of params to append&period;


|===



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